However, it is a good question so I thought I'd throw a few bits of info out there that I think might help.First, I believe that you may have a basic misunderstanding of what is being referred to sort of generically as AFR. The small rubber plug had a leak. This happens no matter how much I adjust the idle screw. Others might require 60 RPM. If you're having issues with your Holley Sniper IAC getting stuck at 20, there are a few things you can try to fix the problem. Remember that as an EFI System Pro customer you have access to me at any time via my cell phone. I believe that you have this problem solved now with your new inline filter/regulator. I've been having problems with my sniper efi just shutting off. The timing can drift 0-30 degrees just due to the width of the rotor tip. If Idle > IAC Kick. Could you provide me with some things to check or some things to adjust? It might be necessary to insulate or re-route your fuel lines if this can't be solved any other way. This is very disappointing as people love to hear the motor while the hood is open.Thanks Jon. I think you will find that it will learn its way through this. Due to when the pump i'm using now makes a loud howling noise when it gets ran for awhile and it gets at a 1/4 tank of fuel or less. Do I need to try taping up the IAC port and setting the idle off the idle screw? If you patiently adjust this over the course of days you will get it just right.Again, glad this is working for you and look forward to a good report in the future! Holley Sniper Iac Delete But I think it is safe to say that you are now at a point were some manual tuning is a good idea. The hold position is part of the response that keeps the car from dying when you come off the throttle. Simply go to those cells, tweak them up or down as required, and the ECU should now be able to learn its way around the bog. That could be a problem with the TPS or it could be some sort of throttle linkage issue. It then started working normally again. If i adjust the throttle plate screw in to bring IAC in to proper range say around 7 the engine is running around 2000 rpm. I certainly appreciate your frustration (as well as your wife's!) Is this an issue to worry about? I ask because I'm using a PCV valve with my Sniper and have random idle issues as well. It is always best to get the base map as close as possible before adding acceleration enrichment. I recommend you have a look:https://www.efisystempro.com/efi-pro-hangout/holley-sniper-efi-instruction/solving-sniper-rfi-problems, I recently purchased your fixed linkage to open primaries first and the throttle linkage extender to also get a smoother pedal. So the issue Im having is low idle. Wish I had bought my sniper from you, but unfortunately didnt. The problem was RF interferance . I will confirm TDC with balancer but I have had balancer off and timed it before and after with same results. First, check to make sure that the IAC is properly mounted and connected. Ensure that the secondary linkage is completely closed (both visually and manually.). You can drop it down and you will find it will behave more like you expect. Thanks. 90% of time with engine hot. The fact that it ran so (at times) with 90+ PSI fuel pressure is a testimony to the Holley's closed-loop technology. Then you can take a close look at the IAC and see if it is opening. I am extremely suspect of what you were told about the Sniper ECU monitoring fuel pressure, for several reasons. I know this is old, but I bought and installed a Sniper kit in 9/18. Please let us know how this works out for you! The 10 step set up on your page set my idle perfect and iac perfect a very consitant 700. If you remove the air cleaner entirely and the whistle continues then you can rule that out. I'm running a 408 sbc. The Sniper ECU can use the timing to help maintain the idle speed and that will definitely be useful in that transition from Park/Neutral to Drive.If you don't have ECU-controlled timing, or if you do and it's not fully compensating, it may be necessary to increase your target idle slightly. I never had a problem with this. I'd suggest that you assume everything the previous owner did was wrong until you can prove that it was done correctly. When the idle speed screw is turned all the way out there should be just enough room between the bore and the blade to catch your fingernail. With everything else being right and since you can make it start by adding fuel it seems like you must have some sort of fuel pressure issue. An under-sized filter will allow part- throttle operation but fuel pressure will drop at WOT and run very lean - perhaps surge under power. Once you confirm the operation of your IAC then it's time to read my article on Solving RFI Problems. *Possible delays due to Covid-19 click for more information. And yes, monitoring the fuel pressure is the right answer. It's going to be really difficult to nail down the problem with the several simultaneous changes that you've made. As you have noted, each time the idle goes up. First thing I would check So if you are trying to achieve a stoichiometric mixture in ethanol (which is achieved at an AFR of 9.0:1) then you should continue to target 14.7:1 since that is what will be displayed. My issue is that the TP% will not reset with key cycle and its idleing at 9% TP. Not to bandstand here but this is the point when where you bought your system is so important. There's still a very small amount of airflow that squeezes past a closed IAC valve; it's that venturi like sound you're hearing. Keep in mind that at 60 miles the This is Intermittent meaning, I can run this test 5 times and IAC will function incorrectly 2 out of the 5 times. Good luck! I can have it working fine (5% to 10% at target idle at operating temp.) My Sniper started having a ticking noise-- I have 90 miles on my Sniper, but this started the last 10 miles or so: it still drives fine, but it worries me so i've stopped driving it for now. After pumping the pedal a few times at different times it dropped to zero and started to work. This page was generated at 12:25 AM. As soon as I got the new one installed and wiredit fired right up and did everything it was suppose to do with no issues. I readjusted my IAC, now it's perfect. The Sniper EFI system looks at the closed-loop fuel compensation required to reach your target AFR. Just getting it to act right at startup is a struggle. Physially manipulating the linkage by hand will generally reveal if you have a sticking linkage that is preventing the TPS from returning from zero. This item: Holley - 543-105 EFI Idle Air Control Motor , Black $71.72 Holley Sniper EFI 870001 Throttle Position Sensor $34.60 Holley 860004-1 92MM Sniper Throttle BDY $223.93 Customers who viewed this item also viewed Page 1 of 1 Start over Holley EFI Idle Air Control (Iac) Valve Motor 30 13 offers from $79.56 The very first thing I would do is get ground truth on your timing. If you haven't confirmed that they it is worth checking. When you set the Static Timing to 15, what did you read with the timing light? Any idea's? All times are GMT-6. Relatively new Sniper EFI install on a '69 Mustang 302. carburetor setup, but it does blow when I can't jump on the highway like I use When you experience this, before you touch anything or shut the engine down, first look at your TPS and your IAC. Its rare that you find someone that genuinely wants to help and see something work good, the information I have received from this page and Chris himself is top notch.1969 Dart GT 340 with a Holley Sniper, I purchased the Holley sniper from jegs wish I knew you sold them put on my truck got the IAC set haven't checked the -40 idle setting yet my problem is my headers are glowing red called Holley I think I got the worst person seemed to care less Afr is set at 12.8 for idle only thing I have changed I don't smell any fumes at idle someone said I could change the coolant temp enrichment but I don't know if it is rich or lean I figured since no smell it is lean any ideas would be appreciated thanks i have a fuel psi gauge reads 60 psi don't wanna melt my motor did not glow with a carburetor. Supports up to 650hp with Four 100 Lb/Hr Injectors! So you installed your Holley Sniper. Between the kick down and the return springs on the throttle body the pedal is so hard to push it's pretty much a jack rabbit start every time from stop, it's almost undrivable, any suggestions on what I could do?thanks for help, I've tried both Holley's tech lines for close to 2 hours with no answer! Sorta similar to a carb having the idle mixture set incorrectly (rich) or the idle speed too low. Note too that the larger the throttle stab, the more brief the time in that cell and the more gradual the change.Here's what I recommend: Get somewhere where you can repeatedly stop and go. I have never seen issue when CTS is below 120 degrees. Hi Chris thanks in advance for any tips. The engine ran so good, I would have never suspected the Fuel Pressure to be an I would continue checking the electrical connections along the fuel supply. Have a look--I think this is going to allow you to fix your idle problem. MAP Sensor. Ran 2 Holley carbs and an Edelbrock. Hi Chris, I have a lean stumble on throttle tip in 2-3% tps taking off from a stop light the afr will go to 19afr and the engine will stumble for a split second. But get that fuel system fixed before going any further. Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. We are using Target AFR of 9.0: 1, Fuel Base approximately 40% higher. I am new to the EFI scene but want to learn. AGAIN This is Intermittent meaning on a recent trip I stopped 3 times and issued occurred once. Drives just fine but won't stay running unless I keep my foot on the gas. Yes, the sound coming out of your Sniper throttle body is a pulsation from the fuel pump that is pulsing the mechanical fuel pressure regulator. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. Thanks for your very detailed question! any ideas? And so glad you guys are enjoying the Sniper EFI system. Holley EFI Electronic Fuel Pressure GaugeI think its a little ridiculous that I cant see fuel pressure on the display even though its measuring it but whatever. Car has run perfect every time and has never hesitated or stalled since. I also noted that after some time, I could change those values as I saw fit. However, I always preach to never touch any of the controls on the handheld until you have a couple hundred miles on the engine in a range of driving situations. I did notice that when I thought I had it set Idle was back to normal but iac was at 0. Bolt-on carburetor style EFI for your classic car or truck. However, I have never found that to be the case. Laptop Access Due to when the pump i'm using now makes a loud howling noise when it gets ran for awhile and it gets at a 1/4 tank of fuel or less. Relatively new Sniper EFI install on a '69 Mustang 302. The 5-6 times it has happened now have been after the car has been running for at least 20 minutes. is train the system or there is actually something wrong.I do love the system at When I see that your TPS is 1%, that tells me that you may have an RFI problem. Am I missing something. I would disregard any correlation between idle control between the Stock and Street/Strip setups. But if you can datalog the bog you can know much more precisely what is happening. itself out and hold idleeventually stalling. I have a Holley Sniper EFI with HyperSpark ignition. Advanced throttle body injection systems capable of transmission control and more. https://www.youtube.com/watch?v=2JpHlS1ymBc, If this is your first visit, be sure to
The team at EFI pro are some of the best I have ever dealt with when coming to ordering parts or having the knowledge to answer any question you may have. If you complete the process and find that the IAC is less than 2% at idle, repeat the process and use the set screw to make the RPM about 60 RPM below the target. If you are using your Sniper EFI System to control timing, navigate to Tuning > Advanced > Advanced Idle > Idle Spark and ensure that the Idle Spark Enabled is set to Disabled. All in all, considering the system has been installed for less than 2 hours drive time we're BLOWN AWAY at how quickly it is "learning" this engine. At that point, with 90 PSI of fuel, the ECU can't turn the duty cycle down low enough to idle properly. With the engine still idling high park, set the brake, open the hood, and remove the air cleaner. If no air is passing (and the idle doesn't drop) then your IAC is working. I have been able to get it pretty you have it set. Either the Walbro pumps you are getting are not genuine (lots of forgeries being sold) or else you have something that is killing them. I followed the instructions and set the IAC to 2-9% when warm with idle at 850 RPM. holley efi. When I removed the tape and started it again, it was idling at 1400-1500 RPM and sucking a bunch of air through the IAC, even though it showed 0% on the sensors screen (pic attached). Any help would b great. Member List; Calendar; Forum; Holley EFI; Sniper EFI; If this is your first visit, be sure to check out the FAQ by clicking the link above. I recently detached the TP sensor from the side of the sniper to physically move it and it still would struggle to get to 0%. Confirm the placement of all wiring, ensure that the WBO2 sensor is positioned properly, etc. Observing the temperature on the 3.5-inch handheld (only), wait for the temperature to achieve 160 degrees F. Once above 160 degrees, turn the idle speed screw so that the idle is about 50 RPM below your target idle speed set in step 1, above. I have an entire article on choosing between Sniper and Terminator X throttle body solutions and while Sniper is still a sound choice for some applications, Terminator X (with transmission control) is hands-down the way to go for those who need that. But I still get the iac at 0 and the rpm at 1200. I will a, Scott has been very helpful and informative on guiding me through the purchasing and installation of my terminator X max system. Otherwise, if removing the air cleaner eliminates the whistle then try to use a thicker gasket or try lightly greasing the gasket. TPS 0. Thanks again for your insights! I guess we can't have everything. But there are several degrees of play there in which it should still work fine. Having a TPS that won't go lower than 9% will affect the acceleration enrichment correction, and could create a stumble at the first moment of throttle opening.Yes, the IAC can and will fluctuate depending on changing conditions. The first 250-300 miles were amazing as the Sniper EFI worked flawlessly. The IAC is hanging open and not really at 0. Interesting question. Yes, having an accurate TPS is very important at idle. Thank you chris for for getting back to me on this matter.I'm using russell hi pressure gas line to feed the gas up to the sniper and using the stock steel gas line that use to be the feed line for the carb to return the gas to the tank. Ok, we have enough Sniper systems out there that I thought it would be a good idea to create a posting on challenges that might arise during installation. Once it decides to come back down, it does so with no issue. check, I guess after reading everyone saying how great the system is after Hello Chris. You might have a bad O2 sensor, really bad exhaust leak or a problem with the ECU. I also raised idle at Park a bit with the idle screw. Let The following are status commands and diagnostics for sensor and various parameters in the Holley software. Maybe give it a half-turn before you start it and then start and tweak. It reads 0 at idle and when I accelerate it goes up to 30 and makes a loud sucking sound that seems to be holding the car back. You are looking in the right area but I would probably not change the ROC blanking. My problem with the sniper is the whistling and hard throttle pedal, I have a 700r tranny with a kick down cable. I recently bought the car with the EFI system on it. Bolt on 4150 Flange Carburetor Replacement. Now it's at 5% on a big cam 440 Mopar. The Super Sniper will allow you to monifor fuel pressure if you add an electronic sender but this is not an option with the standard Sniper. I had that problem, right out of the box it would not power up, sent it back in, had defective hand held. Copyright 2022 Holley Performance Products, Inc. All right reserved. Your second problem should be a bit more concerning. The tps will not auto reset to zero. Switch power to the Sniper on and crank the engine. The IAC going to 30 is normal. I would start by datalogging the situation and seeing exactly what your learn table looks like in the area immediately around the tip-in. This is actually more troubling than the sound you originally described. But after sitting static idling for a little bit, the IAC goes to 100% & stays there. Once it commands that high idle I haven't found anything to return it to normal, other than shutting it down and restarting. On startup- cold or hot, I get a 2 second high idle of about 1500 RPM before normal set idle of 750 RPM happens. I tried adjusting my IAC up to 10deg in both directions with no change. After manually making the sensor go through the full range a few times, I reinstalled it and now my TP will read anywhere from 0% to 4% when I key on. I set it exactly like the instructions said and my iac is not only all over the place but when I finally did get it to the 2-10 range it's highlighted in red. Across the board, all of our customers say how impressed they were that it started and ran right out of the box just by following the simple installation instructions. A question I cannot get a 100% answer on is can you piggy back off the Sniper EFI TPS for an electronic transmission? I would suspect something is coming loose causing a stop to the EFI system/Fuel flow. Price Point: $$$. This only happens when coming to a stop and the idle is ramping down to the set idle RPM. :-). Idle : IAC Rampdown : IAC hold positionChange this by maybe 2% in either direction. Hey Chris, I installed a Holley sniper on a small block 400, first start was great! If you find that the IAC is more than 8 percent, repeat this process and instead of shooting for 50 RPM below your target make it only 40 RPM below the target idle speed.
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