When I drive with warm engine the IAC is at 30% when pushing gas, but shouldn't it be at 0%? When I put it in gear, it drops so low that it will stall if I don't add throttle. I installed the Holley gauge you suggested in another thread at the fuel input to the TBI, and the fuel pressure is constant around 64 according to the gauge. Holley will take a look and tell you you have RFI and wish you good luck in finding it. Holley EFI Electronic Fuel Pressure Gauge, article on choosing between Sniper and Terminator X throttle body solutions. (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. Or is there something else I should If your RPM is 2000, your TPS is 0, and your IAC is not closing, then there is some problem. The 10 step set up on your page set my idle perfect and iac perfect a very consitant 700. Honestly, I've never seen this happen but if the butterflies were misaligned on the shafts it could allow too much air to enter. I hold my foot steady in place it does this in 5 second cycles and if i let go of All of the wiring exits below the rear fuel injector cover, for a completely stealth installation. I never had a problem with this. Tps is saying 26% when it at idle. Laptop Access No problems with either cold or hot starts. 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. What could be the cause? I drove it a bunch more yesterday afternoon/evening and the same thing happened several times. Ensure there isn't a vacuum leak causing the IAC Position to drop to 0%. If the IAC is zero, and if putting your finger over the IAC port doesn't lower it, then it's not the IAC circuit. Shut off the engine, ensure power to the Sniper is switched off. But you've got to find where air is getting into your engine.The reason it's going up as high as 2400 RPM is because once you press the throttle beyond 1% the IAC opens to the park position. Have you confirmed your fuel pressure at idle is 60 PSI? Since a key cycle resets it to 0 and out to 30 or wherever What can I do? Could you provide me with some things to check or some things to adjust? I appreciate the help youve given to everyone as it continually helps me! check out the. While you have over 200 miles on the system, you must realize that in the part of the map where the ECU finds itself during lanches you might only have a total of 5-10 seconds in any given cell. Copyright 2022 Holley Performance Products, Inc. All right reserved. And if you're going to go this route I'd recommend that you switch from "Simple" (3 A/F targets, one each for Idle, Cruise, and WOT) and go to the 2-D Table Hello Which means you either need to increase that number or increase the ramp decay time. The idle will not return to the set value.The second issue is the same as the first but the motor will stall out. I can adjust at 160deg, but my fans turn on at 180deg. 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. Kind of cuts into forum time. Incorrect connections will result in excessive resistance. I have replaced the IAC motor and the problem remains. (Plus they it just looks way cool in your engine compartment!) I would suggest you take a look at that if you haven't already. and go to restart warm, it catches starts for a flick of a second, drops to a stall, or sometimes will catch its self and start. Ok, so I'm stumped! Ultimately, it is about making the pedal softer, particularly at initial throttle opening. May God's grace bless you in the Lord Jesus Christ. 2. They also worked with me on a sale I missed and price matched those parts. 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. Hi. 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. I have installed my Sniper and the car runs great. Relatively new Sniper EFI install on a '69 Mustang 302. If you go the other way then you might find that the IAC zero's out when the fans are off. Hot start it most of the time wont start unless I give it a little throttle. Next, reach down into the secondaries and push the butterflies closed. My guess is a faulty IAC since it is intermittent and I have not done any setup changes. Note: The IAC breather hole is the roughly 1/4-inch triangular hole that sits above and between the secondaries. But after sitting static idling for a little bit, the IAC goes to 100% & stays there. 63 bomb If idle drops below 800 it wont come back itll chug around 300 rpm for a few seconds then die. My sniper is doing two thingsFirst issue, the idle is set at 800 and will idle fine, then There is a glitch in the system. The motor has 376hp at flywheel and the car is a stick shift. The resulting resistance can burn up fuel pumps, wiring and relays. I have a bone stock 350 that I installed a Sniper on and had the same whistle noise, presumably from air going past the butterflies. Either the Walbro pumps you are getting are not genuine (lots of forgeries being sold) or else you have something that is killing them. Once you know that then you can work on those problems. That is not the way to go. I think you will find that it will learn its way through this. If you can track specific engine coolant temperatures where the engine stumbles and dies that would be a good place to start. That 60% (which is configurable) is known as the Clear Flood TPS. That is certainly not normal! Your AFR is pegged lean. 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. It's all part of the pleasure of EFI. About two minutes after I get it set at 850 & 5%, it has progressed to 100%. He is able to get it to start by quickly depressing the accelerator to at least 60% and releasing. 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. port that goes right on the inlet of your Sniper and makes installation a breeze.If your fuel pressure is solid at about 60 PSI then you should start looking at 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). The engine ran so good, I would have never suspected the Fuel Pressure to be an any advise would be appreciated. Don't know if I should put this in a separate post. I thought 12.0 was leaner at idle, but I figured out I was wrong.lol. Please give this a try and let us know how it works! Yes, you are correct. Lubricate the linkage so there isn't as much native resistance. I received from the controller manufacturer greatly understates (at best) the repeated failures of others I know personally who have tried and failed. Engine warms up to 195 degrees and stays. TPS% = 1 Even though you think your timing is perfect I'd suggest you try cranking about 5-10 degrees of advance into the distributor and just see if that doesn't work better for you.Remember this: adjustable timing pointers go out of adjustment and harmonic balancers slip. I will turn it up some. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. If I adjust idle screw out to get the tps to zero or even 1% the engine will not idle. The next time it happens is the perfect opportunity to find the problem. your IAC is at zero. Well you were right air was entering from another source. It's hard to know what the previous owner did right versus wrong. The distributor was loose. Then Friday night as I was driving home, the car started acting up. First, I'm kind of insistent about not changing any of the default settings unless the vehicle absolutely will not cooperate enough to drive/learn, and only then if you have a specific understanding of the problem and a specific solution. 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 What an amazing site you have here. That, on top of your air leak, is allowing the engine to idle at 2400 RPM. You're going to have to get this fixed or it's going to cause even more problems than the high idle. I set the AFR at 13.5 and all is good now. I go into much more detail about that in this article on startup tuning. ChrisI finally got everything resolved. Yes, let me know how that setup process works. Then you can take a close look at the IAC and see if it is opening. I know its not flooded because I can pour a little gas in the throttle body and play with the accelerator and it will start and run fine. IAC Pos.% = 0 Running new vintage air system so the is only a single power wire to compressor thats why I asked if I needed to run input wire to ac relay or if iac would pick it up fast enough(which its not). However, I have what I will call a whistle at a throttle position on 35 - 50. This page was generated at 12:26 AM. 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. Stupid question, but where do I see if it's entering Learn mode? After this whole process, the car normally rotates without a very abrupt pedal. Don't be surprised if one or the other is slightly open. So you installed your Holley Sniper. By the way your site and your accessory products are nice. Using a Snap-on variable timing light so this is why I say timing is perfect. It didnt do this with the carb on it. To figure this out it's going to be important to gather a bit more data. If you set the RPM above idle to start ramp too high, then it may not ever get down to the RPM above idle to re-enable. Note that sometimes you can get into a back-and-forth situation. Does this seem reasonable and how hard will it be to get the idle and off-idle performance correct? *Possible delays due to Covid-19 click for more information. The team at Holley has designed the perfect solution for your problems. But when you have it then you can look for exactly what the IAC is doing at that point, and if there is anything that might lead to this happening. I have adjusted many settings and eventually mess it up and go back to the original map. Please check your process again and see if you can see very specifically what is not working correctly. I would recommend that you call first thing in the morning, as they tend to get quite busy during the day and wait times can get long. Sorry for all the questions, new to the efi world. If your fuel pressure regulator has failed (and they often fail by blocking return fuel and maxing your fuel pressure) then it could lead to rich idle, particularly until your engine gets up to temp. The broad consensus has been that the Sniper is an amazingly straight-forward install and starts and tunes as expected. My car will now start when its cold, but after about 30 seconds the idle drops down and begins to run like crap. First thing I would check Some have suggested mis-setting sets the idle speed at 850 RPM but I suspect it is not a fixed number but rather a delta of about 300 RPM above the target. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Put a strong piece of tape over the IAC breather hole--duct tape or something that couldn't possibly be sucked into the throttle body. We offer some tips to help with that. It is reliant on the data acquired by the included wideband oxygen sensor. Thanks again. After 50 on the throttle position I'm not sure if the whistle goes away or you just can't here it anymore. ps. If they are closed, check the primaries. 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). 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. They tell you to ask call Holley. What is it supppse to be at idle and while driving under heavy acceleration? 1. Realize that when you drop the throttle, the engine enters a condition it will only see for a fraction of a second at a time. At idle my IAC is 3-4, AFR around 13-14, TPS is 0, timing 15-17. That is not a huge problem but it just means the IAC has no ability to lower the idle beyond what it is running at that point. If your TPS is at zero and your IAC is at some random number above 8% (but not exactly 30%) then for some reason your engine has not met the conditions to ramp down to target idle. 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 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. is train the system or there is actually something wrong.I do love the system at Plus, you can email that file to me and I can be of more help. Ensure all your sensors are displaying proper values. Switch power to the Sniper on and crank the engine. So check that timing and I think that you're going to find you need a good bit of advance. I also raised idle at Park a bit with the idle screw. The whole topic of using the Sniper TPS for transmission control is one deserving of it's own article but I'll try to summarize a bit here. Then, when you experience the high idle, note if the IAC number has increased. I keep wondering how it was running so good with IAC percentage is 5 to 10% when idling with fans on, What you're experiencing is the delay time between the ECU sensing the additional load and the IAC actually increasing the RPM. They also recommended that their ground be spliced into the Sniper ground as close to the Sniper as possible. Don't make any changes more than about 10% and keep the same basic shape as the original (High/flat below 20 degrees, sloped downward up to 180 degress, and then flat again above that.) How can I adjust the startup speed down to about 1400 RPM? It turns out that some of the Snipers are shipping with the minus 40-degree setting drastically lower, as shown in the following image. Cl. I asked him a million questions and waited a long time to save up before purchasing the system and I have asked a lot of questions throughout the installation process. View Holley Sniper EFI Self-Tuning Kit - Shiny Finish. I installed my Sniper and the engine fired up great. That changes almost instantly as the engine revs.Since the learning algorithm requires some time exposure to a certain condition to make larger changes, that half-second makes only the smallest impact. 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. Good luck! Have a look--I think this is going to allow you to fix your idle problem. The last pic is with the car in Drive. What should I be looking at to calm this down? Target AFR, A / F = 13.5 I'm so glad you found this helpful--that makes my day!Don't get too concerned about the specific learn percentage. No, the idle speed curve setting isn't something that you normally worry about--and especially not down at minus 40 degrees farenheit. Good afternoon Chris, thanks for taking the time to help all of these folks that didn't purchase from you- myself included!The issue I seem to be having is at idle in both park/neutral and drive.
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