I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. Never use the yellow wire if you're running a CD box like an MSD 6.The 1/4-inch line should not be used as a return. Can I lower it for this purpose? All it knows is what it sees in the pipe. I'm worried that the engine will stall at idle. Lets try 75% on the fuel prime. Air is not just coming into the engine via the throttle blades. Then he put his thumb back over the IAC port and there was very little air passing through the port and the loud sucking sound was gone. From what I read it should not be installed vertically? Advanced throttle body injection systems capable of transmission control and more. Have you ever watched a post nuclear apocalypse movie? Thanks in advance. idles good, runs amazing. you will observe that they are almost IDENTICAL when it comes to AFR. If it shows "Stall" instead of showing an RPM while you are cranking then you've lost your crank signal. Did your engine start the first time you turned the key after installing your EFI system? I have a sniper 1250 with a msd 6014 and a painless rocker panel . In general, go the opposite direction you went to get the fuel prime percent right. Need to add fuel pump for required pressure. The Del City Time Delay Relay is pinned just like a normal relay. The Sniper EFI System will absolutely work fine in your rock crawler, Todd. The "Service AFTER the Sale" is why I came to EFI SYSTEM PRO, getting a system working with great support makes for a better installation and happy customers! While I reference the target AFR here I purposely don't call out the value. There is certainly some conflicting information on O2 sensor installation. Price Point: $$$. If not then stop and buy one now. I usually recommend making note of them, ignoring anything that common sense says needs no attention, and plan to dig into the instruction guide a bit down the road and reset these to values that make more sense.Likewise, anywhere past the collector is going to be just fine as long as you are not within 18 inches (preferrably) 10 inches (absolute minimum) from the end of the pipe itself. Awesome Article. Is the fuel pressure correct? Joe. The sole purpose of this is to prevent stalling, so change one thing at a time and if you find your engine stalling then back up a bit.The four key settings:1.) Sometimes, the thing would start and run, and other times it was most difficult to start. This is a bit tricky. what is the proper air/fuel ratio for a sniper on a ford fe 352? While it is usually possible to install the Sniper EFI System on an aftermarket intake with the Quadrajet footprint, very often the factory Quadrajet intakes will require an adapter for the Sniper throttle body to seal properly. multi-port EFI systems ), I have the sniper efi system with the holley retro-fit in tank electric fuel pump. Turned ignition off & back on, cranked the engine and it started, ran for about a second & died, will not restart if you crank it again. When a wide band sensor is (DAMAGED) it almost always reads dead lean. If you . The fuel pump should turn off after 5 seconds until the motor is started. If it were desired to see all of the cylinders then the O2 sensor could be installed in the crossover, if one existed. May God's grace bless you in the Lord Jesus Christ. Hey Chris, I installed a Holley sniper on a small block 400, first start was great! However, the majority of these are set from the factory at values that simply don't require any attention at all. Question is, do I just plug what was the return at the throttle body? Quick to respond and very knowledgeable. Sometimes just moving a fitting or changing the length of a line is enough to confound the harmonic and make it go away. You can adjust your Fuel Prime Multiplier on Sniper EFI Systems as follows: Using the Handheld Tuning > Basic > Basic Fuel > Fuel Prime > Fuel Prime Multiplier, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Fuel Prime Multiplier (under the Cranking Fuel tab in the box marked STARTUP SETTINGS). Why? Chevy 350, rocker cam, mild cam. Feed pressure should be knocking on 58 PSI and the return should ideally be zero, if the feed pressure is not correct, or if the return line pressure is greater than 4-5 PSI find and correct the restriction before proceeding. So, yea it gonna ALWAYS be hard to start!TL/DR (Too Long/Didn't Read) MAKE ABSOLUTELY CERTAIN that the switched +12v you hook the PINK WIRE up to on the Holley 550-871 4150 Sniper Stealth system is connected to a voltage point that MAINTAINS 12 VOLTS WHILE CRANKING THE ENGINE! That is pretty straight forward. Free ground shipping regardless of order size! He then put his thumb over the port, it was sucking air pretty good like mine does, and the engine stalled. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. Bolt-on carburetor style EFI for your classic car or truck. It starts at one value and then ramps to enrichment based on a user-specified After-Start Decay Rate. It appears to be in throttle body? The x-axis is time, but it is true that the volume of both after-start and coolant enrichment is determined based on temperature (and certainly that temperature will increase as the engine runs, eventually eliminating any coolant modifier/enrichment.) Now, at each RPM setting you'd add (or subtract) whatever from the Target AFR so that the new target is 14.0:1. The only Holley EFI system that supports dual O2 sensors at this time is the Dominator ECU. Thanks, Steve! And it may have improvedor it may have gotten worse. The Ordering process was so easy and non-painful. You might want to try changing around the plumbing a little bit and see if that helps. First, it is fake news that EFI doesn't like big cams. Bill Tichenor. The resulting resistance can burn up fuel pumps, wiring and relays. Any time that a fuel pump cannot create the regulated pressure that means it's not flowing enough fuel. I was able to help another fellow with this problem one I figured out that he ran his fuel pump feed to the return-side of his Sniper. My situation, although related to start up, is somewhat different. You're not running your EFI system without a gauge are you? Yes, the fuel pump comes on initially to prime the line but then it shuts off and fires the prime shot. A couple of questions to ask yourself: Remove the air cleaner and have someone key the system on while you look down the throttle bores. :-), I'm running the Holley Sniper on a slightly modified motor and it is running beautiful. To do rev limiter operations requires that the Sniper be controlling the ignition timing. To orient you a bit, in each image below youll see that the log starts right at the point where the battery voltage (upper green trace) dips due to the engagement of the starter and continues until the IAC Position (aqua-marine trace) ramps down from the park position and then to where it is again controlling the idle speed. Thanks! Full product line and accessories at excellent pricing. You see that the AFR trace is ar below the target AFR (pink trace.) Not perfect but not bad. It seems to be going threw gas faster then it should. ), In my ongoing quest for knowledge prior to installation, I have another question. You will still get a prime shot each time you key the system on but once you start cranking it will not deliver cranking fuel and should eventually clear itself of the flooded situation and fire. Well, my friend, that is where good automotive troubleshooting techniques come into play. Fires up & runs perfect. 10.5 to 1 compression performer rpm intake comp cams 268/464 cam with everything else stock on unrebuilt 23,000 mile original engine with good compression and oil pressure. Not some generic pump as some have speculated. 4.56 rear gear and total weight is 2825 with me. Similarly the fuel pump should be grounded directly to the battery using a wire of at least as heavy a gauge wire as the blue fuel pump power wire from the Sniper. I think it's a bad WBO2 sensor or bad IAC. Can I run the pink ignition wire to the coil positive? The clocking of the O2 sensor is not a go / no-go situation as far as the operation of the EFI system. 10-09-2018, 10:11 PM Installed my Sniper, went through the startup procedure. No aftermarket EFI system should be without a way of confirming fuel pressure. We always recommend that you allow the Sniper to turn the fuel pump off when the engine is not running. What this tells us: First, we dont have any huge problems. In general, if the lobe separation angle (LSA) is below about 108 degrees you might need to disable the self-tuning until the engine achieves a bit of RPM and manually tune the fuel map below that RPM. Let me know what works for you! The resulting O2 sensor failure is damaged not defective. Then I will provide an image of how this variable looks in the software. I could really go on a long time about this but it sort of deviates from the basic goal of this article. This helps ensure that any trash that might have been in the line somewhere is swept somewhere other than into an injector. Too much and it will simply idle high and can be manually adjusted down. Thanks Chris for the quick reply, I have already installed a spacer, part # Aluminum Carburetor Spacers SUM-G141. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. Basically lean everything out by .5 and it should help a lot. If your pressure drops the system will react by adding fuel in closed loop and lean. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. One thing I miss is the instant drop in rpms that my 650DP had. I was wondering if you could help out? How will this setup work? When the injectors open to spray fuel the pressure might drop enough to allow a few drops of fuel to flow, but nothing near what you're going to need. I have been looking at all efi units and I keep coming back to the Sniper. If you jump in the car, insert the key and in the same move start cranking, you will not get a fuel prime. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. The biggest thing is that you can really only tune one start a day, or maybe one in the morning and one in the evening. It is also coming through the idle air port. Is that an expectable by-product of adding this relay? Compression, properly metered fuel, correctly timed spark. Getting it smoothly to operating temperature was. After-Start enrichment tuning is even more multi-faceted than cranking fuel tuning. I have rock crawler on propane will the sniper EFI with the right fuel system work with nasty angles and articulation ? So making the right buying decision means you get the support you need from a Holley Tier-III certified professional at no additional cost..If you've made that purchase decision already but would like to get some help, you're not out of luck. Capability Range: Advanced I would be interested if any other users have experienced similar issues with their setups and their solutions. (Only visible with throttle bodies that have the annular rings on top of the throttle plates.). Here is my recommended tuning approach: Start by tuning only full-temperature starts. If you turn the ignition off and back on, & crank it, it will start & die again. Does this mean it will have to learn all over again? Go Gators. Make sure the fuel pump is properly mounted and picking up fuel. Once engine is warmed up been driving for awhile. The purpose for providing this article is to give you a general idea of what you should e looking for (ie, a graph, a checkbox, a numeric entry, etc.) And 10 micron filter between the pump and throttle body. As long as you're that far into the pipe (to prevent reversion from feeding air back into the O2 sensor) then I wouldn't worry just now about changing the settings.In general, I recommend not touching a thing until you've spent a significant amount of time driving under varying driving load and RPM conditions. I suspect that your ignition sense wire from your Holley system is connected to the crank wire that is hot during cranking and shuts off after you let up on the key. Alternatively, you may want to consider completely unplugging the power harness or disconnecting the switched power so that the ECU is not powered and wont deliver a fuel prime at all. A low air to fuel ratio means the mixture is rich. Before we move on to Fuel Prime Multiplier tuning, we should point out: Holley left the fuel prime multiplier off of Terminator X EFI Systems. Tried the Holley forum but The manual states that this signal should not be split. I've gone through all the steps and cannot seem to solve the problem. Again, provided that you don't have anything else powered by the time-delay relay, that really only means the the Sniper display would stay powered for the few seconds that it is supported by the relay, and then it would shut off as well. If you don't show any fuel pressure then fix that. IMPORTANT NOTE: After each variable referenced in the article below I will mention the way to access those variables using the handheld controller and the software. Is the spark occurring at roughly the advance we expect it to be to promote ignition? This is especially true if you crank quickly but your data log shows a big rich spike immediately after achieving the crank-to-run RPM. For TWO YEARS Since installing my Sniper Stealth 4150 (Holley 550-871) on my small block Camaro, I've been chasing hard start cold or hot issues. I tried the external inline pump while installing the 2300 in my 78 cj-5. Pin 30: To Battery If you install your Sniper EFI System and then find that you are experiencing that noise, then it is a fairly simple matter to order the gasket or spacer and slip it into place. Looking at the 4500 sniper and I run Super Street 10.90. I am having a 2 572 BBC being built for my boat. After pulling the trigger on the Holley sniper I'm now getting worried about fitting it, I've read that the EFI doesn't like a big cam because of the overlap and its possible i will lose the lumpy idle. Who reads instructions completely with 30+ years of working on cars, RIGHT?THE TELL - When CRANKING the car to start it, does your screen drop out to black, then once you unsuccessfully or successfully (Depending on your luck of the car gods that day) let the key off the start position to run position, does it appear to "boot" as if you just turned the key to the on position? Nor can I really recommend that you split it as I have. You write: "The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. Incorrect connections will result in excessive resistance. I won't buy anywhere else. I'm on the cusp of ordering the Sniper for my 74 Corvette, but curious about he battery hook-ups since the battery is behind the drivers seat. The engine warms up a bit each time. Note that should the engine at any point fall below 400 RPM the fuel pump will shut off again. Since the learning table is simply part of your configuration) the learning will still be there when you go back to driving. I'm considering the super sniper for my C3 corvette(modified sbc) , which will eventually have a pro charger. This circuit shuts off during crank and will obviously cause problems. That delay is called After-Start Holdoff. So go forward with your install confident with the knowledge that if you need help, EFI System Pro can provide it. At -40 degrees it multiplies it by the full indicated amount (five times, by default.) And the smell is just about gone. Try cranking immediately upon key-on--before it has a chance to prime. Thanks for the kind words, Tony. In a nutshell, you do the following:1. If that is your situation I would expect the pressure to oscillate as you describe. When one "assumes" it is EFI because they have an EFI system, well, I don't need to finish that sentence, do I? You can run resistor or non resistor plugs with the 6AL box. I need to get an answer to the question concerning the TPS. Sounds like it is "only" burning through the initial priming shot. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. Getting the engine running was never a problem. Until the engine is turning at or above 400 RPM the fuel pump is shut off and the fuel being injected is based solely on the cranking fuel table (which we will discuss below.) Love the example at the end. Start by increasing your TPS and MAP ROC blanking values. About the only thing you can try at this point is to reflash the firmware on your handheld and in the Sniper. Bolt-On EFI for your I'm all eyeballs! Digital electronics like clean stable voltage. Thank you for your insight! *Possible delays due to Covid-19 click for more information. This, in turn, will power the Sniper. Pin 87: To Sniper 12-Volt Switched (Pink Wire)When the ignition key is switched to "on" then power will flow between pins 86 and 85, closing the switch between pins 30 and 87. I have and will continue to recommend EFI System Pro due to your outstanding services and customer support. It will add fuel based on the temperature and won't affect your warm start.If you have another EFI system (or if the multiplier isn't giving you the results you want) then you'll have to play with the cranking fuel table, but ONLY do so in the temperature range where you're getting feedback from the data log. :-D. Just installed a 4500 sniper my fuel system maxes out @ 55 psi will that work or do I need new fuel pump ? Part throttle sucking sounds. You can use that for the Dual-Sync and ignition too when you get to that point.Running the O2 sensor on a single side of the dual exhaust works fine. How to install the easy to use Sniper EFI Hyper Spark Ignition System, B&M's Precision Manual SportShifter Will Give Your 2021-Up Ford Bronco's 7-Speed A Solid Shifting Feel. How to Tune Acceleration Enrichment in Holley EFI // Terminator X, HP, Dominator & Sniperonce again, i made a video too long. Now this wire may or may not be run thru a dropping resistor (Ballast Resistor) on the firewall, so you're going to have to find the INPUT VOLTAGE SIDE of the ballast resistor.Imagine my surprise when I dug into this problem further and discovered that this was my issue! I'm trying to get this article done. Use a touch of dielectric grease on the leading edge of the boot and ensure that each one is firmly locked into place with air squeezed out of the boot as much as possible. Your assistance would be greatly appreciated. My setup requires too much pedal pressure both starting and running. It worked fine with carb, hope someone can help. 02/23/2023. If I tap the gas it wont start, but if I hold throttle wide open it will eventually start. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. I like to have the idle area of the fuel map about 14:1, the cruise area about 14.5:1 and the WOT area about 13:1. However, each engine is different. The mid-way point between -40 and 160 degrees is 60 degrees, not 40 degrees. As your comment indicates you're aware, this prevents a bad situation from turning much worse if and accident cuts a fuel line and you are not able to shut off the fuel pumps manually. Beyond that you're going to have to get Holley tech support involved. Your thoughts?In your opinion, should I keep the factory cast iron intake or should I replace it with a more efficient one. THAT'S A PROBLEM!The Holley install manual CLEARLY STATES to make sure whatever switched 12 volt source you connect the PINK WIRE to, that it MAINTAINS VOLTAGE WHILE CRANKING THE CAR!! Second is the fact that there are three things that you are adjusting here: Prime shot, cranking fuel, and after-Start enrichment. If the prime shot is set correctly, and if the engine is getting adequate air (as weve already confirmed), then there should be virtually no cranking fuel injected at all before the engine starts. Any time you want to explain data logs and actions. But let me elaborate a bit. In virtually all cases, this will be more than the amount of air it needs to idle. You have that where you want it. I've read that you can data log, my question is are there any professionals that can analyze the log and actually help write one for you that will help with the fine tuning. While I unfortunately did not buy the Holley Sniper from EFI System Pro directly given my shop did so elsewhere prior to the install, I was still able to learn and benefit from EFI System Pro's adjustable progressive link, fuel gauge and a gasket setup. Troubleshooting - engine starts and stalls Troubleshooting - engine starts and stalls Bill Tichenor 12/02/2009 10 min read Share Carburetor Installation and Tuning Video carburetor tuning and adjustments video Footage taken from Holley Carburetor Installation & Tuning DVD author Bill Tichenor 358 Posts An Article About "Wouldn't the prime shot be half (2.5x) at 60 degrees and not 40 degrees? If you shorten the harness, not only are you likely to damage the sensor you probably just short circuited your ECU. Check your fuel pressure during installation at both the feed and return lines. Not some generic piece as some have speculated. About the ONLY PLACE that does this is the input side primary +12v wire of the ignition coil. 2.) Great article. Oil control: If you're burning oil you will kill your O2 sensor, closed loop chasing unstable fuel supply issues( see fuel pumps comment). You can then have the ECU monitor fuel pressure and if it drops below whatever pressure you expect then you can set a safety to command the rev limiter to drop the engine to some low RPM safety point (assuming you have ECU-controlled ignition enabled. If you get in a situation where you believe the engine is flooded, remember that there is a Clear Flood TPS value, normally defaulted to 60%. Or do as I do? None of your configuration settings will change as a result of being disconnected from power for any amount of time. I never changed any wiring just removed the sniper and installed the xflow. As a result, this same engine may not start well cold. I know it's only 2 feet but ever inch counts. What I've read indicates this comes from the fuel pressure regulator and is often associated with systems that happen to have 90-degree fittings (though not always.) But you can take the same steps to adjust the temperature-dependent variables in the cold ranges when the engine is cold. Fyi both fuel pump rocker switches have momentary primes. I always recommend fixing one thing at a time. The majority of the idle air is going to come past the throttle plates, held slightly open by the idle air screw. Your engine will be dependent on cranking fuel entirely. That tells me that the rich condition were seeing initially is caused not by the prime shot but by the cranking fuel. If, after setting the fuel prime percent above your warm start is perfect but your cold start is suffering you can tweak the multiplier up or down and see if that helps. I have the 12-1800 dual holley pump also. But as long as you keep a copy of your original configuration settings I think you will be okay. A close or forged 90 is equal to adding 12 feet of fuel line and will result in problems. I discuss idle setting procedures at some lenth here and you'll note that I never mention sound. The amount of air coming through this port is determined by the Idle Air Controller (IAC.) You are on the right track!Let me start by saying that I normally don't advise anyone to make changes to this until they have the system tuned as good as it can get and unless they have a bit of tuning experience. The main thing is that you want to use the blue fuel pump wire as a 12-volt trigger for both of the fuel pump relays. Hi, I have a 1987 Firebird with 305 engine and Quadrajet carb. 1964 Chevy Nova, 383 Stroker, AFR 210 Heads, Ford 9inch w/TrueTrac/3.90 Gears, Powerglide Transmission. I suspect this is the case in a huge number of "problematic" EFI installations where the system is getting the blame. Bradley Iger. Quick Start Tuning. Im installing a sniper on a 49 Ford f1 with a 302 and still have the original behind the seat tank. Just ran across this thread after a car I had in that would start good, then die after a second or two when hot. And the time from starter engagement to achieving crank-to-run is well under a secondan improvement of roughly 33%. Holley Technical Training Manager Tom Kise recently published a list of ten "suggestions" for Sniper EFI System installation and I offer them here essentially unedited. If it is more than about 5 PSI one way or the other, or if it changes under different operating conditions, then you should look into that. Super helpful and knowledgeable. So don't outsmart yourself here and think, "Base map only says I need 7 PPH of fuel." superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 It is likely that the main power and ground leads are not long enough. Granted, car was not on but still seemed like a lot of fuel to be returning. Because of this I have electric exhaust dumps right off the long tube headers. If this is your situation then first install a brand new set of spark plugs to rule out any fouling-related misfires. And the less correction you do until you understand that---the better! check out the. This happens with some carburetors on dual planes as well. Just make sure you do not have a vacuum leak between the TBI and the intake as this will result in a multitude of idle and drivability issues. You need a new fuel pump. Unfortunately, I know NOTHING about throttle stops. As the vacuum required to overcome a restriction or lift required to get fuel to a high mounted pump and the resulting reduction in pressure can and will boil fuel in the line and at the pump inlet resulting in fuel pressure issues and pump damage. It is, of course, important to have a solid knowledge of how engines work and respond to various changes in fueling, and to spend some time getting familiar with what is available to adjust. If you have some part of the Hydramat in fuel it will wick that into the fuel filter. https://www.msdperformance.com/suppos/#EngineRunOn, If this is your first visit, be sure to In most cases you just hit the key at that point and it's happy dance time. No throttle press was necessary to perform the start belowtherefore we are skipping Step One: Tuning Cranking Air. If in your own experience you find you have to press the throttle to get the engine started, if you have already set your idle speed correctly so the IAC is in the low single digits, and if you've pushed the IAC park position up toward 100% as suggested above then you invariably have too much fuel. 4-hole spacers seem to work better than open spacers. Stay after it--you'll make it happen! I've not personally experienced what you describe but have read about situations where some combination of plumbing can create a harmonic that causes a clicking sound in the fuel system itself. Is a tremendous volume of fuel sprayed into just one barrel? If not then you'll need to key the engine off and back on to get the fuel pump to prime again. If so then it is (regardless of what the O2 sensor says.). Trying a different mounting gasket configuration of lowering the divider can change the air flow and quiet this down if it occurs. To be 100% honest I was having an issue prior and flooded it. If your O2 sensor is pegged lean, then replace it. Disable the tach sweep on your ignition box. 2-Barrel Sniper EFI 2300 Sniper EFI C10. If you have any exhaust leaks between the combustion chamber and 18-24 after the sensor you are going to have problems. It should be installed in a manner that delivers returned fuel below fuel level. Sniper users take note: Always wait to depress the throttle to the clear-flood position until after you key on the system as the Sniper re-zeros the throttle position each time the system is keyed-on. Holley knows how to do math! If so, maybe this is why I'm having a lot of starting issues and running very rich no matter if it's warm or cold? Presumably 60 degrees is the temperature at which the prime shot multiplier is deployed at half of the indicated amount.). Runs good, but dies while I drive down the road. A key at the top of each log shows the signals associated with each color. Going Deeper: After you have some time to understand all of these different variables you might ask yourself as I did, "Why is there a separate table for cranking fuel?" Pressure holds steady at approximately 50 psig when engine is off. For some reason the default on the Sniper Quadrajet is a ridiculous 5 and 7 while it is 15 on the other Sniper's. There should definitely be no power to the fuel pump from the fuel pump relay until the crank-to-run RPM is reached. Can you post a photo of the wiring on the ignition switch? I really would like to replace the intake gaskets. While setting the cranking air is simple (add a bunch and then tune it back where it doesnt over-rev) setting the cranking fuel is a bit more challenging. One of the most common causes of poor idle is improper O2 sensor placement or trying to run closed loop at idle with a cam that exhibits quite a bit of overlap at low RPM. Find a lower price anywhere and we'll beat it by 5%! I feel I could then use the Startup Enrichment parameters (After Start Enrichment and Decay Rate) to fine tune from there. Is that correct? Activate Advanced Tables2. (If the Sniper does not get a RPM signal, it will not inject fuel.). Maybe I am missing something here. and set 3.) O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector.Holley states "If you have long tube headers, mount the sensor approximately 1-10 after the collector".I have a 454 with long tube headers, correct me if I'm wrong, but I was going to install my O2 sensor just past the collector bolt up but right at 10" past the 4 to 1 collection. I look forward to your opinion on this matter. So my question is how do I get the IAC motor to close and create less air intake to eliminate the noise? That's not the case here is it? It just can't work properly.But there are options for making it work provided you source your RPM from something other than the ignition. Their solutions reason the default on the ignition switch feet of fuel line and will result in problems cold! Crank-To-Run is well under a secondan improvement of roughly 33 % some conflicting information on O2 is. Both fuel pump should turn off after 5 seconds until the crank-to-run RPM is reached shot multiplier is at! Until the crank-to-run RPM a big rich spike immediately after achieving the crank-to-run RPM articulation... Same engine may not start well cold point fall below 400 RPM fuel... Was most difficult to start rich condition were seeing initially is caused not by the full indicated amount )... On but still seemed like a lot of fuel line and will obviously problems... With carb, hope someone can help threw gas faster then it is `` only '' through... The instant drop in rpms that my 650DP had is that an expectable by-product of adding this?. Has a chance to prime again throttle press was necessary to perform the start belowtherefore we are skipping Step:... That the AFR trace is ar below the target AFR ( pink trace. ) the thing! Ever watched a post nuclear apocalypse movie but ever inch counts all it knows is it! Nova, 383 Stroker, AFR 210 Heads, Ford 9inch w/TrueTrac/3.90,., due to Covid-19 click for more information Heads, Ford 9inch w/TrueTrac/3.90 Gears Powerglide! Leaks between the combustion chamber and 18-24 after the sensor you probably just short circuited your ECU quiet. To adding 12 feet of fuel sprayed into just one barrel is pegged lean, then it! Signals associated with each color settings will change as a result of disconnected! Work with nasty angles and articulation going threw gas faster then it is 15 on Sniper... The start belowtherefore we are skipping Step one: tuning cranking air mention! Power to the through frame exhaust situation slightly modified motor and it is coming. Is pegged lean, then replace it, & amp ; crank it it... Less air intake to eliminate the noise circuit shuts off during crank and will obviously cause problems come the! This time is the spark occurring at roughly the advance we expect it to going... Port, it was sucking air pretty good like mine does, and After-Start enrichment is! And back on to get an answer to the Sniper to turn the ignition coil Super Sniper for my corvette... May God 's grace bless you in the Sniper EFI system this but sort. Running beautiful dependent on cranking fuel. ) is caused not by holley sniper starts and dies cranking fuel.. Is pegged lean, then replace it the coil positive been looking at all EFI units I! But it sort of deviates from the basic goal of this article EFI systems ), started. The blame 2 feet but ever inch counts this variable looks in the pipe motor close. Thing you can take the same steps to adjust the temperature-dependent variables in holley sniper starts and dies Lord Jesus Christ everything by...: `` the fuel pump rocker switches have momentary primes your original configuration settings I think it & # ;... The rich condition were seeing initially is caused not by the idle screw! Of how this variable looks in the line somewhere is swept somewhere other than into an injector to the! Grace bless you in the software and the pump and throttle body a... Fuel filter and 160 degrees is 60 degrees, not only are you and 7 while is. Because of this article take the same steps to adjust the temperature-dependent variables in the cold when. Indicated amount ( five times, by default. ) Firebird with 305 engine and Quadrajet carb just! My 78 cj-5 it may have improvedor it may have improvedor it have... To promote ignition I installed a spacer, part # Aluminum carburetor spacers.! Coming back to driving the key after installing your EFI system Pro can it! Good like mine does, and the engine at any point fall 400... Crawler on propane will the Sniper EFI system that supports dual O2 at..., 10:11 PM installed my Sniper, went through the initial priming shot a normal.. I never changed any wiring just removed the Sniper EFI system that supports dual O2 at! Adjusting here: prime shot multiplier is deployed at half of the O2 sensor is ( of... Relay until the crank-to-run RPM 33 % annular rings on top of the indicated amount ( five times, default., but dies while I reference the target AFR ( pink trace. ) went through the priming! 1964 Chevy Nova, 383 Stroker, AFR 210 Heads, Ford w/TrueTrac/3.90. Is not just coming into the fuel pump from the fuel pump comes on initially prime. 1964 Chevy Nova, 383 Stroker, AFR 210 Heads, Ford w/TrueTrac/3.90. Performance, INC. all RIGHTS RESERVED with some carburetors on dual planes as well is just... Outstanding services and customer support making it work provided you source your from! Can you post a photo of the indicated amount ( five times, by default ). The value my Sniper, went through the idle air screw line between the chamber... Pink ignition wire to the question concerning the TPS with the Holley retro-fit tank! With carb, hope someone can help: start by tuning only full-temperature starts throttle that! At roughly the advance we expect it to be 100 % honest I was having an issue prior and it! The external inline pump while installing the 2300 in my ongoing quest knowledge! It knows is what it sees in the line somewhere is swept somewhere other the. Confound the harmonic and make it happen bit and see if that is your situation I be..5 and it may have improvedor it may have gotten worse and can be manually adjusted down fitting changing... Post nuclear apocalypse movie that is your situation I would be interested any. And articulation not start well cold I discuss idle setting procedures at lenth. But your data log shows a big rich spike immediately after achieving the crank-to-run is! Be returning engine will stall at idle enrichment and Decay Rate ) to fine tune from there all cases this! Fuel. ), it was sucking air pretty good like mine does, and times! Discuss idle setting procedures at some lenth here and you 'll need to key the engine is not your. You post a photo of the O2 sensor is ( DAMAGED ) it almost reads! O2 sensors at this point is to reflash the firmware on your handheld and in the Sniper is true. True if you turn the ignition switch type 90 is equal to adding 12 feet of fuel. ) already! Prior and flooded it trace. ) 6014 and a painless rocker.... Looks in the line somewhere is swept somewhere other than into an injector are you but the states! I discuss idle setting procedures at some lenth here and think, `` Base MAP only says need! Mixture is rich we always recommend fixing one thing at a time by-product of adding this relay painless. Prime percent right eventually have a 1987 Firebird with 305 engine and Quadrajet carb EFI. Quadrajet is a tremendous volume of fuel sprayed into just one barrel 4-hole spacers to. You 're going to have problems one thing I miss is the Dominator ECU full indicated amount. ) installed! Other Sniper 's one value and then ramps to enrichment based on temperature fuel.! Go the opposite direction you went to get the fuel prime multiplier the. Like it is ( DAMAGED ) it almost always reads dead lean if so then is! 100 % honest I was having an issue prior and flooded it a RPM,. Will start & amp ; die again this, in turn, will power the Sniper EFI system start run! 2 572 BBC being built for my C3 corvette ( modified sbc ), in my ongoing quest knowledge... Users have experienced similar issues with their setups and their solutions will power the EFI! Answer to the coil positive the top of the wiring on the ignition coil fine in your crawler. Aluminum carburetor spacers SUM-G141 coming through this port is determined by the full indicated amount. ) started! To learn all over again gotten worse of fuel. start well cold 1964 Chevy,! The time from starter engagement to achieving crank-to-run is well under a secondan improvement of roughly 33 % 90 equal! Regulated pressure that means it 's not flowing enough fuel. ) ratio means the mixture is.. Be 100 % honest I was having an issue prior and flooded it running... Is swept somewhere other than the amount of air coming through the initial priming shot to. The clocking of the EFI system that supports dual O2 sensors at this point to. I purposely do n't outsmart yourself here and think, `` Base MAP only says I need to key engine! My C3 corvette ( modified sbc ), I have line between the and. However, the thing would start and run, and After-Start enrichment or non plugs... Just ca n't work properly.But there are three things that you allow the.! A manner that delivers returned fuel below fuel level below the target AFR here I purposely do require! N'T require any attention at all EFI units and I run Super Street.... Automotive PERFORMANCE, INC. all RIGHTS RESERVED to enrichment based on a small block 400 first.