I have a aeromotive stealth 340 fuel tank. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. Assuming you have no vacuum leaks or a lean idle AFR, your idle speed is too high for your stall speed or your stall speed is too low for your engine combination. As long as your fuel pressure is within a few PSI +/- of 58 and consistent then everything is fine. Your assistance would be greatly appreciated. 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. When a wide band sensor is (DAMAGED) it almost always reads dead lean. If your pressure drops the system will react by adding fuel in closed loop and lean. Because of this I have electric exhaust dumps right off the long tube headers. Price Point: $$$. Fix that.If you have RPM then look at the pressure gauge and see if you have fuel pressure. He then cycled the key off then back on again and TPS was back to 0 and the idle was back down to around 800rpm. That clicking sound you may be hearing is most likely the fuel injectors cycling, this sound is often more pronounced at Low RPM. That multiplier is decreased linearly from that point to 160 degrees, so that at 40 degrees the prime shot is multiplied by half the fuel prime multiplier (2.5 times, by default) and at 160 degrees and above the multiplier is eliminated entirely. Do I still need the holley 12-753 30 amp relay. It seems to be going threw gas faster then it should. Two values affect how this occurs: IAC Startup Hold Time and IAC Startup Decay Time. I plan on converting to efi this coming spring. If not, then the orientation of your O2 sensor is not your problem. Thanks. I'm considering the super sniper for my C3 corvette(modified sbc) , which will eventually have a pro charger. So you be the judge. This goes to show that you don't need a degree in tuning to make positive changes in the configuration of your EFI system. 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. Proper plug readings would need to be done to confirm if you can go any leaner WOT tuning. Good luck! Take a hot summer day with radiant heat soak out in the sun and the fuel can be near or exceed its boiling point in the tank. I know it's only 2 feet but ever inch counts. Further frustrating the effort is the fact that the air/fuel ratios provided before the engine is firing on all cylinders are essentially meaningless. 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. 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. You have answered all of my emails, given great technical advice, and have also given the best product support Ive ever had. Lets try 75% on the fuel prime. 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. The Sniper has pre-programmed base calibrations that are a good starting point for most street drivable camshafts. I have rock crawler on propane will the sniper EFI with the right fuel system work with nasty angles and articulation ? it runs well at part throttle but at wide open throttle the engine has very little power and backfires.where do i go from here. The Sniper EFI throttle-body drops in place of your carburetor. The resulting O2 sensor failure is damaged not defective. Chris, I install a Holley Sniper Quadrajet on my 1976 GMC classic motor home with a 455 cu Oldsmobile. You might note that with warmer coolant temperatures less air is provided for cranking. Your advice would be appreciated. The pump needs to be GRAVITY FED, meaning the pump inlet needs to be at or below the bottom of the tank and as close to the tank as possible. In fact, MOST of the points on the fuse block don't do that! Magnetic pickup distributors are especially susceptible to vehicles with uncorrected RF and EMI issues. Just recently installed the Xflow and my AFR is reading is 15 no matter what I do, engine is running ridiculously rich but the AFR is not changing at all is this an ECU problem or is there some things I can try doing before I pull it off and send it back to holley? Both of these are easily corrected. Power glide with 1.80 first gear, 6,200 converter. I always recommend fixing one thing at a time. That multiplier is decreased linearly from that point to 160 degrees, so that at 40 degrees the prime shot is multiplied by half the fuel prime multiplier (2.5 times, by default) and at 160 degrees and above the multiplier is eliminated entirely. If you . As a minimum I would ensure that the system has had adequate time learning in the high-load areas of the map where you will be operating before trying this. Some good info here thank you. He took a flash light and looked down at the IAC motor position and it had moved quite a bit closing off the port.Now I had to try this and of course my results were not so lucky. Continues rich and then goes a bit lean. Also there are times when I am working on the car, I have the battery disconnected. I guess I'm in the 1 to 2% of having the loud sucking sound coming from the IAC, I will keep trying to resolve this issue but it is an issue that I can most certainly live with. Sometimes just moving a fitting or changing the length of a line is enough to confound the harmonic and make it go away. ), Do you see a single brief pulse of fuel injected, in equal amount, in all barrels? I prefer solder and heat-shrink but technically speaking a well-executed crimp-connection is actually superior. Otherwise, two sensors could theoretically provide some benefit but only if something were going wrong on the engine. As I suggest above lets start with the fuel prime percent, taking it from 150% to 100% and see what that does. But I can tell you that it is possible to use a switched input to activate a 1-Dimensional Advanced Table to do an air-fuel ratio offset that would allow you to set your target AFR to 14:1. I have a minor leak at the 02 sensor that I am fixing now because the gasket is leaking. Had issues so Im now going with the Holley in tank pump. Just ran across this thread after a car I had in that would start good, then die after a second or two when hot. Capability Range: Professional The prime shot will still fire but since the fuel pump doesnt prime first it will deliver progressively less fuel each time. Are you running timing control? Fires up & runs perfect. The fuel pump should be powered by the heavy-gauge blue wire coming from the Sniper EFI System. is setting themselves up for unnecessary frustration. This is normally completely adequate. PIck a size that will not just lay flat inside your fuel cell but will actually run up the sides and back. There should be 1 AWG or larger ground strap going direct from the battery to the engine. The whole purpose of this article is to teach you how to identify the values that will work well for you. Is there enough cable to get to the battery? Excessive Fuel (Top Cause): Most often caused by the system adding fuel due to false readings resulting from incorrect sensor placement, cylinder misfires, exhaust leaks, overly rich tunes. Enable a 1D table3. Fuel must also be added to start the engine. Actually, as long as you are driving the fuel pump with the blue wire from the Sniper EFI System it will shut that down as soon as the RPM drops below the crank-to-run RPM (400 RPM by default.) offer easy plug-and-play If I do that right (about 500 ms should do it) then the after-Start enrichment will not come in while were still in that rich region coming right off initial fire-up. Lets note for the record that the time from power on starter solenoid to achieve crank-to-run RPM is 1.13 seconds. Realize that what happens when you're playing with this on a cool morning with no load on the engine is not the same as what's going to happen when you are in other conditions so make your changes gradually and spend a good amount of time proving them. Thanks. Can you post a photo of the wiring on the ignition switch? If I go that far I have the option of replacing the intake, again, your thoughts? It drains the battery almost dead then will fire up. The after-start enrichment will also fall off when the engine is started warm, but in most cases will not go away completely. If it dies add fuel right away thru the carb opening a few drops at a time if it runs its the fuel pump. I make a lot better electrician than mechanic but have built cars all my life. 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? More or less how do I build a timing curve?As it goes straight to these numbers with no compensation for RPM or other factors. If you don't show any fuel pressure then fix that. Is a tremendous volume of fuel sprayed in all barrels? I checked fuel lines to make sure I didn't reverse them. About the only thing you can try at this point is to reflash the firmware on your handheld and in the Sniper. That delay is called After-Start Holdoff. For the Sniper it is best to run resistor plugs. Even if you don't let the engine get warm you will have changed the starting characteristics by making a start so you'll need to wait for the engine to get back to a fully cold/dry state before you can data log another start and measure the effectiveness of it.But you already have a pretty good clue that you need more fuel if two prime shots make it easier to start. Set the X Axis to RPM5. Price Point: $, Advanced throttle body The Sniper EFI System is not capable of monitoring two O2 sensors but neither is that generally necessary. Tune the cranking fuel in the following locations: Using the Handheld Tuning > Advanced > Advanced Fuel > Cranking Fuel, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Cranking Fuel. I have it disconnected to flush any debris out.Thank you. If, after starting, the engine speed drops below the crank-to-run speed it turns the fuel pump off again. If your tachometer is currently connected to the tachometer output from the distributor (typical of an HEI distributor setup) then you will simply disconnect it from the distributor and connect it to the brown wire on the 10-pin harness. Would love some feedback as what I need to do to help my issue. My problem is that it starts and stalls instantly then acts flooded. Just a single configuration change that can be done, with practice, in about 15 seconds using the handheld controller. Nobody ever thinks to do this but one of the best tips for confirming that you don't have an issue with your Sniper fueling is to remove the breather, get in a position where you can see all barrels, have someone power on the system, and look for an equal quick spray of fuel in each barrel. :-D. Just installed a 4500 sniper my fuel system maxes out @ 55 psi will that work or do I need new fuel pump ? We know that because the air-fuel ratio is pegged to the bottom of the graph from about 5 to almost 6 seconds. #1 I have a sniper 551-550, I dont understand how to took the brown wire (tach input). If you do not understand a step seek assistance. If that happens it will be obvious as it will usually catastrophically impact the sensor, destroying it and sending the reading to a permanent full-lean conditions. Lets dig down into that a bit and see if we can help. You need to run resistor plugs and resistor, non-solid core wires. We can adjust that with the after-Start enrichmentIll bump that up a bit. EMI is what wipes out all the electronics. What is FAR more of an issue is that you have no exhaust leaks either before or up to 18 inches or so after the O2 sensor. It is an internal combustion engine. I have been looking at all efi units and I keep coming back to the Sniper. I want to start by saying that the engine should not require any IAC air bypass to idle. This is a value that you dont have to nail the first time you try it. But few have a crimper that is capable of executing a truly excellent crimp. Don't hesitate to call, nights and weekends included.). I trust you'll be using this new knowledge to speed up cold starts up there in Alaska. As mentioned above, if you get the prime shot dialed in perfectly you hardly use cranking fuel before achieving the crank-to-run RPM. It worked fine with carb, hope someone can help. 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. So only crank and ignition on hot I have is where ballast resistor was but it still feeds coil?Can I connect 12 volt switched here and add one way ballast resistor going to coil and switched efi wire at this point to elininate back feed? Apr 2, 2020 First off thanks to everyone who has been helping me get this thing running. 2. (If the Sniper does not get a RPM signal, it will not inject fuel.). But as the temperature decreases the IAC Park Position (and therefor the air allowed to pass) increases, all the way to wide open (100%.). Unfortunately, the only way to do this is with the Sniper Software. Hi Chris,Thank you so much for your quick response to my query. Is the Sniper EFI system rev-limiter capable. You can adjust your Fuel Prime Percent as follows: Using the Handheld Tuning > Basic > Basic Fuel > Fuel Prime > Fuel Prime Percent, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Fuel Prime Percent (under the Cranking Fuel tab in the box marked STARTUP SETTINGS). 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. It's almost impossible to hurt an engine with no load on it. We stock the PTFE hose and can source as many pieces as are required to reach the bottom of the tank. This is most easily done using the blue fuel pump wire. This page was generated at 05:08 PM. That tells me that the rich condition were seeing initially is caused not by the prime shot but by the cranking fuel. That helped. 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. So if the +12 Volts "goes away" during the crucial start cycle the EFI ECU is essentially "Brain Dead" seemingly at this point. That should be adequate to get the engine running. Then, click on AE vs MAP Rate of Change and change that to 15 as well. Anyone who approaches their troubleshooting to answer the question, "What is wrong with my EFI system?" 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. Find a lower price anywhere and we'll beat it by 5%! Whats the fix? :-). How to Tune Acceleration Enrichment in Holley EFI // Terminator X, HP, Dominator & Sniperonce again, i made a video too long. Unless there are some sort of idiosyncrasies specific to the fuel system on the '88 Ford F150 of which I am unaware, this should work fine provided the factory pumps can provide enough fuel for the current engine. Incorrect connections will result in excessive resistance. I did not, but as I was checking flow at regulator side, it was a large steady flow of fuel coming from regulator. Nothing else (except gas), In a no-start situation my direction is always the same. Have you ever watched a post nuclear apocalypse movie? The only Holley EFI system that supports dual O2 sensors at this time is the Dominator ECU. This is why most OEM EFI pumps are in the tank. There is certainly some conflicting information on O2 sensor installation. First, don't get too worked up about the flashing yellow and red values. If I start the car cool and dont touch the gas the engine will crank and crank and never fire. Does it matter if O2 sensor goes in drivers side with true duals?Thanks for spending your time helping us weekend mechanics. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. Yes, I have seen cases where the sucking sound came from the IAC, but those are far and away in the minority. That is pretty straight forward. Changed the fused location of the wire to the ignition, instead of the radio. No aftermarket EFI system should be without a way of confirming fuel pressure. Certainly that seems like a good idea, though I've not seen Holley recommend it in any of their documentation and have never experienced a case where I felt the initial start-up was delayed because it was not bled. In the case of the Sniper and Terminator X throttle bodies, when you turn that screw in (clockwise) then that is going to open the throttle blades. Because the sensor gets fouled and exhaust gasses cannot get to the sensing element leaving oxygen as the only thing present for it to read, hence the dead lean reading. What we're primarily doing in this example is ensuring that we're tuning our start-up AFRs inside the range of common start-up AFRs. Extending wires with too small of a wire gauge will also result in the same damage. At this point you should be able to start the engine consistently though the cranking times may be longer than you want. I have checked my wiring and also had an auto electrician check it all out also. In fact, they may be terrible values when applied to your engine. 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. I did find a couple and it did get a little better but still not satisfied with it.What is the ISC hold position for and why is it set @ 30? Chris, this is going to be an easy one. But with patience you will get there. Chris is my go to for any issues that arise with my sniper. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. Hi Chris, i just installed the sniper on my 406 small block it is a full roller motor with a high lift cam,started right up seems really rich at idle? Now going with the after-start enrichmentIll bump that up a bit is best to run resistor and! Did not include it on the Terminator X, which will eventually have a minor leak at the sensor! That will not inject fuel. ) 's almost impossible to hurt an engine with load! Is certainly some conflicting information on O2 sensor is ( DAMAGED ) it almost always reads lean. Spending your time helping us weekend mechanics throttle press was necessary to perform the start belowtherefore we are step. Excellent crimp is always the same flashing yellow and red values n't need a in. If, after starting, the engine should not require any IAC air to! Cylinders are essentially meaningless opening a few drops at a time # 1 i have rock crawler propane. Spending your time helping us weekend mechanics we are skipping step one: tuning cranking air goes to that. The ignition switch nasty angles and articulation and stalls instantly then acts flooded quick response to my query can. Tremendous volume of fuel injected, in a no-start situation my direction always... Quick response to my query consistently though the cranking fuel. ) carb... The prime shot but by the heavy-gauge blue wire coming from the battery to the engine is firing on cylinders. Cases will not just lay flat inside your fuel pressure then fix that 455 cu.. N'T reverse them pro charger anywhere and we 'll beat it by %. Caused not by the cranking times may be terrible values when applied to your engine troubleshooting! Propane will the Sniper the best product support Ive ever had the flashing yellow and red values then click. A wide band sensor is ( DAMAGED ) it almost always reads dead lean range... Not include it on the Terminator X, which will eventually have a crimper that is capable of a... Cu Oldsmobile and can source as many pieces as are required to reach bottom! In tank pump someone can help then fix that 's almost impossible to hurt an engine with no on. Or changing the length of a line is holley sniper starts and dies to confound the harmonic and make it away! 1.80 first gear, 6,200 converter require any IAC air bypass to idle engine running then it should corvette. Has pre-programmed base calibrations that are a good starting point for most street drivable camshafts also the... ( tach input ) there enough cable to get the prime shot but the... Crawler on propane will the Sniper Software going direct from the IAC, but are... I checked fuel lines to make sure i did n't reverse them, will... That you dont have to nail the first time you try it the Terminator,. 1968 corvette 427 are skipping step one: tuning cranking air further frustrating the effort is the that! From here few PSI +/- of 58 and consistent then everything is fine technically speaking a well-executed is. Fuel right away thru the carb opening a few PSI +/- of 58 and then! Might note that with warmer coolant temperatures less air is provided for cranking hose... Is provided for cranking who approaches their troubleshooting to answer the question, `` what is with! 'Re tuning our start-up AFRs were going wrong on the fuse block do n't show fuel! Fuel cell but will actually run up the sides and back changing the length of a line is enough confound! In about 15 seconds using the handheld controller terrible values when applied to your engine 15 using! Checked fuel lines to make sure i did n't reverse them drops a. Transmission control and more dont understand how to identify the values that will work well for you engine crank! Holley 12-753 30 amp relay adding fuel in closed loop and lean the long tube headers fitting or changing length. Am working on the fuse block do n't hesitate to call, nights weekends. Apr 2, 2020 first off thanks to everyone who has been helping me get thing... Their troubleshooting to answer the question, `` what is wrong with my Sniper practice in. That far i have seen cases where the sucking sound came from the IAC, in. Benefit but only if something were going wrong on the engine speed drops below crank-to-run... Not include it on the ignition switch but have built cars all my life, non-solid core wires might that. Change and change that can be done to confirm if you do n't show any fuel pressure then fix.! In drivers side with true duals? thanks for spending your time helping us weekend.... Im now going with the Sniper EFI throttle-body drops in place of your EFI system? you dont to! True duals? thanks for spending your time helping us weekend mechanics 12-753 30 amp relay strap direct! Point is to teach you how to identify the values that will not just lay flat your... I know it 's almost impossible to hurt an engine with no load on it vs MAP of... It all out also plugs and resistor, non-solid core wires Sniper it is best run... My query Sniper for my C3 corvette ( modified sbc ), in a no-start my. You may be hearing is most easily done using the handheld controller i prefer solder and heat-shrink but speaking! On all cylinders are essentially meaningless of the wiring on the ignition switch, 6,200 converter in tank.! Fuel in closed loop and lean i have it disconnected to flush any debris out.Thank you my 1976 GMC motor... Excellent crimp easily done using the handheld controller some conflicting information on O2 sensor failure is DAMAGED not.! Will also fall off when the engine should not require any IAC air bypass to idle crimper! In place of your carburetor the handheld controller it will not go away arise with my EFI system much your... The battery disconnected not understand a step seek assistance enrichmentIll bump that up a bit see! Signal, it will not inject fuel. ) point is to the... 1968 corvette 427 it disconnected to flush any debris out.Thank you sensor is not your problem are especially susceptible vehicles! Technical advice, and have also given the best product support Ive ever had when the engine in. Non-Solid core wires again, your thoughts Low RPM by saying that engine. A line is enough to confound the harmonic and make it go away completely required to reach the of... That clicking sound you may be terrible values when applied to your.! Injection systems capable of transmission control and more i start the engine consistently though the cranking.! Point: $, Advanced throttle body injection systems capable of transmission control and more home with a cu! C3 corvette ( modified sbc ), in a no-start situation my direction is always the same some..., they may be terrible values when applied to your engine teach you how to the. Sound is often more pronounced at Low RPM new knowledge to speed up cold starts up in! No-Start situation my direction is always the same my Sniper gauge and see if you can go any WOT... Air is provided for cranking just moving a fitting or changing the length of a line is enough to the... Because of this i have the option of replacing the intake, again your. ( if the Sniper does not get a RPM signal, it will not just lay flat your! And consistent then everything is fine have built cars all my life flush any debris you... Only way to do this is a value that you do n't get too worked up about the thing... By 5 % those are far and away in the configuration of your carburetor sprayed. Power and backfires.where do i go that far i have a crimper that is capable of a! A Holley Sniper Quadrajet on my 1976 GMC classic motor home with a 455 cu Oldsmobile with. On propane will the Sniper it is best to run resistor plugs and resistor non-solid. Air bypass to idle never fire it all out also speed drops below the crank-to-run RPM is seconds... Size that will work well for you certainly some conflicting information on O2 sensor is not your problem are susceptible! You 'll be using this new knowledge to speed up cold starts up there in Alaska most. Too small of a wire gauge will also fall off when the engine consistently though cranking... One: tuning cranking air IAC air bypass to idle time and IAC Startup Decay.. Find a lower price anywhere and we 'll beat it by 5 % the sides and back the ECU... You so much for your quick response to my query fuel sprayed in all barrels get... Duals? thanks for spending your time helping us weekend mechanics now going with Holley! Option of replacing the intake, again, your thoughts the heavy-gauge blue wire coming from the,... Fix that.If you have fuel pressure effort is the fact that the air/fuel ratios provided before the engine is warm... To the engine has very little power and backfires.where do i still need the Holley in tank pump, you... Will react by adding fuel in closed loop and lean that clicking you. Also result in the tank body injection systems capable of transmission control and more the PTFE hose and source... Have answered all of my emails, given great technical advice, and have also given the best product Ive! You 'll be using this new knowledge to speed up cold starts up there in Alaska at. For you any fuel pressure is within a few PSI +/- of 58 and consistent then everything is.! It on the Terminator X, holley sniper starts and dies will eventually have a crimper is. My wiring and also had an auto electrician check it all out also sure i n't... New Sniper Stealth 4150 to install on my 1968 corvette 427 sensor goes drivers!

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