I am having an issue with the IAC on the Sniper. 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. Hey Tommy, we've got at least one thing in common. Doesn't want to start, runs like crap. I've changed all the Yes, it will talk to you--but not with words. Keep in mind that at 60 miles the Try it! Thanks again. I did notice that when I thought I had it set In some cases, you may only be able to put as little as 10 RPM between the hard idle and the target idle. Hi I wish I had bought from you but I didn't find this site until now. Capability Range: Moderate Sniper EFI Initial Startup and Troubleshooting Staff Writer 01/20/2020 I did change the -40 thing also. But I think it is safe to say that you are now at a point were some manual tuning is a good idea. Note that Brazilian gasoline has 27% ethyl alcohol. The manifold pressure increases with the throttle opening but the RPMs are still low. This software is going to allow you to open both the configuration file and the datalogs that you create, overlay them and you can get a much better idea of what is happening. IAC Calibration / Hanging rpms | Team Chevelle What would cause the idle to faulter like that? Cycle the ignition as instructed by the handheld and then navigate to the distributor setup screen. I'll bet you find that you can get it working great without any manual tuning. It does this with the engine off. installing and cruising down the highway 70 mph I just wonder if all I have to do The weather in Ct has finally improved and I have put about 60 miles on the car with the Sniper system. I appreciate the help youve given to everyone as it continually helps me! This was an issue in the earliest version of the Sniper firmware. It's going to be really difficult to nail down the problem with the several simultaneous changes that you've made. Full product line and accessories at excellent pricing. Even at 0% it's sucking a bunch of air through the IAC port. It will drop down to 400 RPM then climb 500 and then shoot to 900 and then come back sometimes two or three times then catch it self an idle just fine again. These problems will go away when you do that. Going in the direction you did (higher) is going to reduce the acceleration fueling that the engine sees. 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. Any suggestions would be appreciated. FYI: Car is a 1970 Mustang 302 Ford Racing roller motor. 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. It could be that you've left a vacuum port unplugged, it could be that the throttle plates are misaligned (unlikely), it could be that your IAC is not closing properly. Has a good size camshaft cant find any vacuum leaks. It really takes a lot of throttle tip-ins before you get anywhere near "learned" in this part of the fuel map.Based on your description, it sounds like you have a lean stumble. Cycling the power to the Sniper EFI would cure the problem, but not prevent it from coming back. Is that normal? (Don't drive and watch--get a helper!) Since your target is probably more like 700, and since 2400 is way over 1700 RPM, it's going to leave the IAC in the park position.Buckle down and find how air is getting into your engine. Interesting question. is jumping all over the place when you experience this condition, it does not I have a set of 8.8 Accel Rfi suppression wires on it. It is always best to get the base map as close as possible before adding acceleration enrichment. On EFI systems such as Holley's Sniper, all of the EFI sensors (except for the O2 and coolant temperature sender) are mounted snuggly in the throttle body. That is a good thing.I don't have a specific target RPM but always encourage automatic transmission users to bias the idle just a tiny bit higher than what you might otherwise. My IAC and TPS show zero when it does this. If the ECU has not spent some significant time learning yet, I'd recommend going back through the setup wizard and getting everything back to default. I have seen a couple of videos on you tube of the same issue but they don't seem to have found the cure.I hope it is not a computer problem as I have already replaced the entire system because of another problem. Next, clean the IAC and all related parts with brake cleaner. If you can track specific engine coolant temperatures where the engine stumbles and dies that would be a good place to start. I'm new to the efi thing and any help would be seriously appreciated. When the lambda is 1.0, the displayed AFR is 14.7;1 REGARDLESS OF THE FUEL. Let me start with the engine not starting until you press the throttle. I will confirm TDC with balancer but I have had balancer off and timed it before and after with same results. AGAIN This is Intermittent meaning on a recent trip I stopped 3 times and issued occurred once. The throttle plates are misaligned. Relatively new Sniper EFI install on a '69 Mustang 302. Start with the most gradual throttle input you need to launch well, then slightly increase until you feel some stumble. Possibly cap, rotor, coil? lower until I turn down the set screw. Also, I was seriously rich at idleso rich it hurt your eyes. Please let us know how this works out for you! Do you have a PCV on the engine? If there is an issue with using the Sniper EFI TPS signal, is there a remote TPS or an adaptor for the Sniper EFI that allows the TPS signal to be accessed for the transmission. 34K views 1 year ago Holley Sniper How to Set The IAC Idle air Control in 5 minutes or less. Then why don't you Get On The List for Emails Straight From Our Pro? Its timed to 36 degrees. P.S. If you've been running a filter then you have to wonder if you have a legitimate Walbro pump.If you install a new pump and the noise is still coming from the Sniper EFI System then only the dealer who sold you your system can help you. is train the system or there is actually something wrong.I do love the system at When I covered the IAC with my finger, the RPM dropped so low it stalled. Simply use your handheld controller and go to the Tuning > Advanced > Advanced Idle > Idle Speed screen and click on the Idle Speed Curve function. Those little 1/8 NPT gauges are pretty inexpensive and generally pretty easy to find locally.If you confirm that the pressure is indeed 90 PSI you could pull the fuel pressure regulator apart and check it. I go into much more detail about that in this article on startup tuning. (I'm running from a fuel cell on the garage floor 10 feet away with lines in plain sight and do see fuel coming from the return at a decent flow. If you have performed the adjustments above and still have RPM issues, it's time to look for clues. Holley EFI 543-105 Idle Air Control Motor You're going to have to get this fixed or it's going to cause even more problems than the high idle. When I finished the install on my C10, I set it as follows: 13.1 at idle, 14.2 at cruise, and 12.9 at WOT. I had a customer who struggled to understand that. I would not expect that an electric fan would create a noticeable load on the engine but if it did then you'd want to set the idle screw when the fan was not running. It started right up and we did your idle control fix and all is good at idle. For someone in your position, it will become an indispensable tool in your tool box. I straightened that out, got it running and that's where it goes downhill. When this happens, it is impossible to convince the Sniper ECU to allow the RPM to drop below a set RPM--regardless of what the target idle speed setting is. But I can tell you that for most people who try this it introduces so much RFI onto the Sniper that it never works right. Chris---I am contemplating replacing my Holley 750 on my new low vacuum 600 HP 496 with the Holley Sniper FI system. Thanks for any info./insight you can provide, Mark. I keep doing that with the same result. You should get a light spray evenly distributed in all four barrels. Chris, I recently installed my Sniper and have an intermittent idle problem. Car has run perfect every time and has never hesitated or stalled since. 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. I have it set at 650 and it idles anywhere from 590 to 700. Hey Chris, I installed a Holley sniper on a small block 400, first start was great! IAC Creeps To 100% - Holley Performance Products Forums I think that a great number of the challenges that Sniper EFI System Owners face are brought on themselves by getting into the control settings before the system has really had a chance to learn. I had that problem, right out of the box it would not power up, sent it back in, had defective hand held. In the Wizard, select the stock cam setting. Jump on board now! I enalble the idle timing control and fired it back up Iac was at 32% but it would come back down after a bit to around 26%. And, hopefully, within those degrees you will find a place where you don't get the whistle. That is not something I'd ignore. Not to bandstand here but this is the point when where you bought your system is so important. Good luck! My dad wanted to recheck the timing so I set the Static Timing at 15 and it runs perfect. No air should be able to pass. When I start the motor I have to push on the accelerator pedal for the motor to start. Seems to behave more better now. Give them a call and if they are unable to provide customer support the contact the Holley tech support line at 1-866-464-6553. At 0% it shouldn't be sucking any air through that port, correct? Jun 12, 2021. I'd suggest that you assume everything the previous owner did was wrong until you can prove that it was done correctly. I have never seen issue when CTS is below 120 degrees. It wont fire up. hard start about 1/2 throttle from stop it bogs down after 3 or 4 seconds.What I ?I never had my Carb Cold start RPM any higher then 1600 RPM.THANK YOU. Can the return line be an issue?So far this sounds like an ideal setup.>I have had 2 faulty gpa-4 255 walbro pumps go bad. The jack-rabbit start can usually be minimized by adjusting the throttle linkage. I have turned ignition off turned screw in 2 turns and turned ignition back on and tps is at 1-2% not sure whats going on. Good Hang in there--you can do it. If it is then something is commanding the ECU to open the IAC. 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! That is the only way to fly. In most cases the IAC (Idle Air Control) circuit is the source of the whistle. But if you will just advance the timing at idle and see if it makes a difference then that will tell you what you need to know. Add To Cart. IAC Testing Procedure for EFI Systems Running a bbc with coil - my timing is perfect. The 5-6 times it has happened now have been after the car has been running for at least 20 minutes. any ideas? I looking for your expert opinion. Definitely would have went with you guys. The 10 step set up on your page set my idle perfect and iac perfect a very consitant 700. EFI Systems based on Holley's world-class Dominator and HP ECU's. The symptoms I had was a low cold start idle and going lean coming to a stop. That will happen occasionally, but less as time goes and on and the engine tune stabilizes. Thanks for your very detailed question! :-). 680-700.I can't find any reason other than it looses where it is in the firmware with (If you do this you will need to reset the -40 degree setting mentioned at the top of this article. Maybe Holley will add Fuel Prime Multiplier to Terminator X later. Now that you've got your IAC set I'm going to recommend that you run your setup wizard again, which will reset the ECU to the default settings. Otherwise, if removing the air cleaner eliminates the whistle then try to use a thicker gasket or try lightly greasing the gasket. $107.95. Fortunately, I have an article that goes into this in some detail. normal city driving, I no longer have other problems I had with the original While confirming, in the handheld ensure that the Reference Angle is set to 57.5 and that the Inductive Delay is set to 100. The resulting resistance can burn up fuel pumps, wiring and relays. Capability Range: Advanced technical rep said "You ahve high fuel pressure". When you key on, you will hear three distinct sounds: The ECU initializing the IAC, the fuel pump priming, and the injectors firing their prime shot. If If i set the idle to 750, the only way i can get it there is to turn the idle screw all the way out but then its at 0 iac. Let me be perfectly clear: If your engine will not drop below 1350 RPM with the idle speed screw turned all the way out then you have an air leak. back upthe RPMs shoot up to anywhere between 1500 and 2000 and they will not get Is there away to program the ecu to compensate for this at start up. But get that fuel system fixed before going any further. If you go too high then the motor will not return to your target idle when you come off the throttle. Somehow air is entering the engine that was not entering the engine when you originally set the idle speed screw. You could go either way.. When I covered the IAC with my finger, the RPM dropped so low it stalled. Sniper EFI Problems - Holley Performance Products Forums (It should be at or near 60 PSI at idle. It appears that I could now use the dongle and a laptop to custom tune for idle issues if needed. Ive tried setting the prime setting above 150 but it wont take, it always goes back to 150. After this whole process, the car normally rotates without a very abrupt pedal. My IAC was constantly at 100% at idle. The second thing to realize is that even after you get it just right, you need to keep an eye on the IAC number and reset the idle if it gets outside the 2-8% range when idling when warm. 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! Wish I had bought my sniper from you, but unfortunately didnt. But another thing to consider is adjusting your target A/F ratio. Holley Sniper How To Set The IAC (Idle Air Control) in 5 - YouTube All EFI systems need a large fuel filter to trap dirt and yet not reduce volume. The Sniper EFI remote IAC (Idle Air Control) and plug is designed to gain installation clearance on some Sniper EFI 2x4 installations. 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. Sniper is still learning so it will continue to improve.Second, you may have heard the phrase, "correlation is not causation." I would start by datalogging the situation and seeing exactly what your learn table looks like in the area immediately around the tip-in. :-). I had a customer recently with a high idle problem that he eventually traced to pad plug on one of the vacuum ports. I followed the instructions and set the IAC to 2-9% when warm with idle at 850 RPM. If you remove the air cleaner entirely and the whistle continues then you can rule that out. You can drop it down and you will find it will behave more like you expect. Throttle body mounted ECU - no extra boxes to mount. I've been having problems with my sniper efi just shutting off. A problem since day 1 - YouTube Leave a comment if you've had this issue and how you resolved. Some advanced conceptsIf you have the Sniper Can-Bus to USB Adapter, you can connect your laptop, open the software to the learn table, and get a visual for where in the table you are experiencing the lean bog. Thank you very much. That will at least tell you something. Once you confirm the operation of your IAC then it's time to read my article on Solving RFI Problems. The tps has slotted holes, can you adjust it to get to zero? And the only way to be positive about that is with a gauge.Unfortunately, the Sniper does not provide an input for an electronic sender so the next best thing is an analog gauge. Intermittent stalling usually points to radio frequency or electro-magnetic intereference (RFI/EMI). It's called tuning. ps. IAC Pos.% = 0 Unfortunately I did not buy my sniper efi from you. 2. Enjoy! With select intake manifolds, the distributor housing and IAC valve on the back of the Sniper EFI throttle body are fighting for the same . Hopefully replacing the pump again will resolve both issuesWhoa. Just thought I'd ask as there isn't a lot of info out there. It could be that the air flow across the secondaries as they are opening is creating that whistle but that isn't commonly the case.Did you check for leaks around the gasket of the air cleaner? Shutoff engine wait 30 seconds, turn key wait for display to come up, start engine. Hi Chris thanks in advance for any tips. 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. There are six different acceleration enrichment tables that you can tweak and that may be the way to go. I have certainly seen this before on other fuel injected vehicles when hot. Please give this a try and let us know how it works! I recommend confirming there is no throttle linkage issue first. If not then you have some other issue that is behind this increased idle. itself out and hold idleeventually stalling. If I block off the iac with tape , I can get it to somewhat idle, but its not consistent. Getting the throttle blades and IAC to work together will keep your fuel injected hot rod running smooth and predictable. I do know that the reference angle is 57.5, the inductive delay says 100.0. How can I adjust the startup speed down to about 1400 RPM? Tuning > Advanced > Adv Idle > IAC Startup 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. Idle IAC problems? - Holley Performance Products Forums 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). During cruising at 30 miles and release the gas pedal the engine revs at aproximaly 1500 RPM and it won't drop. Nice to meet you. A common issue we see is a result of poor fuel pump grounding running a eyelet from the pump ground to a rusty or painted surface. Chris I am having a little different idle problem I did your -40 thing and that help with high idle but my problem is it idles fine until I drop it in gear and it stumbles a couple times catches up and then idles fine again. NOTE: Do not attempt to set the target idle speed and IAC position until the engine is above 160F! Ensure there isn't a vacuum leak causing the IAC Position to drop to 0%. Could the IAC be broken/malfunctioning? Idle Tuning is a very important part of tuning any EFI system, especially our self-learning units like Sniper or Terminator X EFI. Since it is unlikely that anything else changed it is most likely the IAC is problematic or the butterflies are not shut all the way. Even though the Sniper's fuel map is programmed to provide the correct amount of fuel via injectors spraying at 60 PSI, if the pressure is jacked up to 90 PSI the wideband sees that you are rich and faster than you can even detect it audibly lowers the duty cycle to inject the correct amount of fuel. I believe because the TPS is not registering. The Fuel Base map is perfect, the car works well, runs well, running through the streets, the car is great. They tell you to ask call Holley. If the screen shows iac at 0 and you block the hole to find it open what does that mean? When I cover it with my hands, it gets quieter. 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. Should i adjust idle screw with the fans already on? I recently had IAC issues identical to what you describe. Do you have any clue? On startup- cold or hot, I get a 2 second high idle of about 1500 RPM before normal set idle of 750 RPM happens. This is normally used as an A/C idle-up circuit. Inj. If you haven't confirmed that they it is worth checking. I pulled over and turned the car off and then back on. Some suggestions: i did have the same problem.try lengthening the lever of the throttle.meaning the length from the center of the throttle to the point where you attach your cable or your rod from the peddle. close to idle with the IAC between 2% & 12%. You just need to go back through the IAC adjustment procedure now that idle timing control is enabled. Hello, I am having a tps and idle issue. I have a Holley Sniper for almost 11 month now and it was running fine with no problems until now. Based on your situation above as well as some of other experiences, I recognized that I needed to improve my tuning procedures above to better explain what steps to take if that 10-step process doesn't completely solve the problem. You might even want to add our 4-foot extension harness that will allow you to connect/disconnect the display or CAN-to-USB adapter from inside the car (rather than trying to do that leaning over the engine and under the breather. Key, I believe, in this success is solid connections, resistance-free signal and ground paths, and solid RFI rejection. That could be a problem with the TPS or it could be some sort of throttle linkage issue. Several good bits here. Take a drive and stop somewhere for 30 minutes, CTS is 170 when engine was shutoff. While adjusting the screw if the TPS position reads begins to read higher than 0% cycling the ignition switch will recalibrate the TPS back to zero. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. When I see that your TPS is 1%, that tells me that you may have an RFI problem. The progressive link can be a great solution on standard (non-Stealth) throttle bodies but I would install this LAST after everything else is working perfectly. Honestly, I've never seen this happen but if the butterflies were misaligned on the shafts it could allow too much air to enter. Don't try to correct for the fuel. 400 engine, C6 3 speed automatic, with standard canister coil for ignition, and If I rev the engine a couple times in neutral it will finally return to idle & usually will not do it again for the rest of my trip. We've already tried adjusting the Acceleration Enrichment chart in all ways, going up and down, RoC Blanking, everything, it has no effect. Am I missing something. I'd really appreciate some help. Reducing that a bit will help. How To Adjust Iac On Holley Sniper Purists will sniff that these are not accurate to the tenth of a PSI. Software: Idle > IAC Settings > Idle Spark, Handheld: Tuning > Advanced > Advanced Idle > Idle Spark, After completing this 10-step process, if the temperature displayed on the handheld is still above 160 degrees the engine should go right to it's target. Really appreciate the amount of learning im getting off here. Throttle Tip-In tuning can be a bit of a challenge but I'm confident you can get this resolved, Mike.Let me start by saying that unless you've really done a lot of driving on the system in some useful learning situations then I would set this issue aside and not even think about it. Holley Sniper IAC Surging???? Two things to keep in mind as you do that. Start by doing the fastest start you can that doesn't bog. I'll have to check again tomorrow. Overview. Hi Chris I didn't get any traction on Holley.com Given the circumstances I would say that it is either the IAC motor itself or RFI but you seem to have ruled both of those out. It's all part of the adventure! They are prone to be inaccurate. There is no real mystery here. Featured Products Sniper EFI $7.07 - $2,457.95 470 Products View Parts author Staff Writer 1711 Posts An Article About Video tech Sniper EFI Videos Sniper EFI Tech Sniper EFI sniper Installation However, whenever you start changing things, you can get into a chain reaction. :-). Comp. Thanks for sharing that, Jason--great info! The Street/Strip and race cam setups tend to be too rich initially. Solving RF Interference Issues in Sniper Installations - EFISystemPro.com You can find those settings here: Handheld: Tuning > Advanced > Advanced Idle > Rampdown, Software: Idle > IAC Settings > IAC Ramp Down. My problem with the sniper is the whistling and hard throttle pedal, I have a 700r tranny with a kick down cable. I have installed my Sniper and the car runs great. OK, I did the baseline idle speed screw setting. This minimizes installation time and packages really well on a diverse group of engine applications. I will a, Scott has been very helpful and informative on guiding me through the purchasing and installation of my terminator X max system. The on board fuel pressure regulator in the Sniper throttle body has a small filter clipped over one end . Once engine is warmed up been driving for awhile. I followed the instructions and set the IAC to 2-9% when warm with idle at 850 RPM. If you find that adding 5-10 degrees of advance helps then it's time to do reconfirm TDC. I installed a sniper efi system on my 1969 Camaro. One way is to very carefully watch the handheld monitor, and that may be adequate. Holly offers a very nice Analog-Style Fuel Pressure Gauge that is another option. It drops about 200rpm when clutch engages. If I adjust idle screw out to get the tps to zero or even 1% the engine will not idle. When I first told him to check for leaks he looked back there and said "all good". Even 50 RPM can make a difference in how much impact the transition to Drive has on the idling engine's ability to stay at a fixed RPM.I would not recommend it in this situation but anytime a "kick" in idle speed is desired that is easily done by setting the kick value in Tuning > Advanced > Adv. Yes, you are correct. Suddenly, the engine accelerates alone, hears a great deal of air being sucked in, Copyright 2022 Holley Performance Products, Inc. All right reserved. And all too often we don't take that extra step of using a piston stop to ensure that the timing pointer is on zero when the engine is truly and exactly at top dead center. My Sniper is 99% great! :-). Let Therefore The iac will always be at 10% now, correct? Changing the rpm curve and target rpm has no effect. Sorry for all the questions, new to the efi world. (Note: in the original version of this post we had a section about checking the idle speed curve setting. I'm so glad you found this helpful--that makes my day!Don't get too concerned about the specific learn percentage. EFI System Pro had everything I needed for my EFI upgrade. Should it not do the opposite and do this on a cold start not warm. Get that thing installed and you're going to know a whole lot more about what's going on. Short drives is fine then it'll However, I did have another fellow who contacted me that claims he went through three units before he could get one that would talk between the ECU and the Monitor.

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