In fact, it is those users who seem to end up most impressed with the system. Tuning > Advanced > Adv Idle > IAC Startup Overview. *Possible delays due to Covid-19 click for more information. I would only play with this if you are finding that the other adjustments I suggested aren't working. Possibly cap, rotor, coil? Capability Range: Advanced 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. Um, no. That could be a problem with the TPS or it could be some sort of throttle linkage issue. But now that Terminator X is available, I highly recommend going that route. The learn function will offset the base fuel table until the closed-loop compensation only requires minimal changes. Remember that as an EFI System Pro customer you have access to me at any time via my cell phone. Last night I tried setting the IAC and had the same problems after it's warmed up. Another suggestion is to add an extra turn to the spring built into the linkage to increase the closing force on the throttle shaft. I had HIGH Idle issue and fixing this curve FIXED the ISSUE --- THANK YOUCan you explain what "Current Learn % means, after finally fixing the idle problem this % jump from -1 to -30% in about 5 minutes at idle with CTS @ about 170.Also when starting the car at hot the engine goes to about 2300+ RPM for a few seconds then crashes down to my Hot idle speed of 950 -- bounces a little and then smooths out. I have been able to get it pretty 30 minutes later CTS reads 161, start engine Idle is jumping from 450 (almost stall) to 1500, IAC is jumping all over 10 90. What is it supppse to be at idle and while driving under heavy acceleration? Also what would you say a desired idle should be for a 3 speed automatic ford? It is always best to get the base map as close as possible before adding acceleration enrichment. I have probably 200 - 300 miles on this engine and it has always done this. 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. 90% of time with engine hot. Handheld shows plenty of fuel so I dought it's an issue there. I think you'll be all set! I didn't find your site until I was having trouble. Now that you've installed at least four Snipers it is going to be imperative that you learn to create and read datalogs. ChrisI finally got everything resolved. The answer will divide the possible sources of additional air into two, greatly simplifying the problem.If the IAC number has not increased, then review the article above regarding high idle from a vacuum leak or high idle from sticking linkage. Thanks, That is an strange situation. I followed the instructions and set the IAC to 2-9% when warm with idle at 850 RPM. Idle : IAC Rampdown : IAC hold positionChange this by maybe 2% in either direction. The throttle plates are misaligned. It shuts off when coming to a stop sign, at any cruising speed and romdomly at idle in park but never when excelerating. Thank you for your input. My IAC was constantly at 100% at idle. I had that problem, right out of the box it would not power up, sent it back in, had defective hand held. It sounds like you need a bit more of a fuel squirt on acceleration, Brett. Your AFR is pegged lean. Definitely would have went with you guys. It'll start & run till it's warm, then when I try setting the IAC every time, I try getting it between the 2 & 8% it quits. normal city driving, I no longer have other problems I had with the original I very pleased with the performance, it is a huge improvement from the 800CFM carb I had on this motor. We will definitely be sticking with Holley from here on out for future retro-fits. I installed a Holley Sniper on my Ford Maverick 302 V8. Any ideas here? Great work, expert! It won't take much! Earl's Mechanical Fuel Pressure GaugeI could use that for a quick troubleshooting for 1/3rd the cost of the Holley one. As I said I didn't buy from you so you don't owe me anything. I recently had IAC issues identical to what you describe. I do know that the reference angle is 57.5, the inductive delay says 100.0. However, whenever you start changing things, you can get into a chain reaction. TP range is normal goes up to about 90% with throttle pedal to the floor. I went on the good ole interweb and found your website which was VERY helpful! First, recognize that the amount below your target where you set the hard idle will be different on different engines. The noise is definitely coming OUT of the throttle body. Cycle the ignition as instructed by the handheld and then navigate to the distributor setup screen. I recently install a sniper efi. I pulled over and turned the car off and then back on. Genuine Walbro fuel pumps are virtually bullet-proof. When I am coming to a stop, the rpms will hang at 1200-1500 rpms. By the way, this is a new installation on a 69 Camaro, stock 350, dual sync, etc. Thanks for any info./insight you can provide, Mark. Yes it is controlling the timing and I had issues at first and it controlled the idle just fine. Idle when warm was 850-ish and IAC 3-4 just as when I readjusted it the night before. I'm happy to walk you through what is required. And the rather cavalier "Absolutely!" The problem was RF interferance . Going lower with the blanking might pay dividends, but there is so little room below 7/8 that you will quickly be in a range where every tiny variation in the TPS or MAP is throwing extra fuel into the engine. But another thing to consider is adjusting your target A/F ratio. Any suggestions? I've made all the adjustments, all the settings, and the IAC issue is driving me crazy. When I cover it with my hands, it gets quieter. It didnt do this with the carb on it. What could be the cause? The engine runs beautifully, with perfect idle at 650 RPM, but every now and then I hear the IAC give a sort of "snap" and the idle is at 1200 RPM. 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. I figured out I was going the wrong direction when I was messing with the AFR programming. I'll give the ". Lubricate the linkage so there isn't as much native resistance. 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. The engine has 14: 1 compression ratio, we can not use gasoline. It will learn the fueling eventually either way, it's just that one might get you there a little faster.If the idle is fine at start-up but then increases after you depress the throttle then you might need to lower your IAC Hold Position a bit. If you have performed the adjustments above and still have RPM issues, it's time to look for clues. Then Friday night as I was driving home, the car started acting up. It is a common one. (If you do this you will need to reset the -40 degree setting mentioned at the top of this article. Pw. I followed the instructions and set the IAC to 2-9% when warm with idle at 850 RPM. You're going to have to clean up the wiring in your engine compartment, In particular, look for spark plug wires that might be running near your throttle position sensor. The problem I experience is that after driving for about 10-15 minutes, the car starts idle to high. Without it you are working in the dark. It's going to be really difficult to nail down the problem with the several simultaneous changes that you've made. During after-start idle, the idle will jump up to about 70% if the engine is cold, stay there about 4 seconds and then ramp down to the target idle speed for the current engine temperature. So try changing your IAC hold value slightly:Tuning : Advanced : Adv. I haven't driven it for the 30-40 minutes like the several times it idled at 2200. If I put the vehicle in gear the idle gets higher with temp. The car would idle, I could hit the gas rev the car up and it ran great I also noticed two nice black spots on my garage floor from the exhaust. We are using Target AFR of 9.0: 1, Fuel Base approximately 40% higher. This page was generated at 12:25 AM. After speaking with Holley Tech Support and Tech Support from where I purchased the systemthey decided to replace it. I'm thinking it could be the fuel pressure--- since I have a new Spectra EFI tank and there's been some reports of the interior coating coming off and gumming up the pump however the sniper display DOES NOT show fuel pressure.the Sniper DOES measure fuel pressure on its own - i've confirmed that with holley techs as they told me to purchase the fuel pressure gauge that can just hook up to the 1 wire gauge harness from the Sniper. technical rep said "You ahve high fuel pressure". When the secondary throttle blades are centered in their bores and pivot freely, an additional return spring is not necessary. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. hard start about 1/2 throttle from stop it bogs down after 3 or 4 seconds.What I I readjusted my IAC, now it's perfect. 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. I'm wonder if the iac can cause this. Second, Holley just released over the weekend a video on how to implement a flex fuel sensor on their HP and Dominator ECU's. I had this same exact issue. Then follow all of the instructions above, including confirming the idle speed curve setting at -40 degress as well as following my 10-step process for setting the idle. Full product line and accessories at excellent pricing. Throttle body mounted ECU - no extra boxes to mount. Hope this helps! But nothing beats a good solid gut-check Unfortunately I did not buy my sniper efi from you. 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 Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. You can re-enable this after you have completed this idle speed adjustment process. Reply Quote. The resulting resistance can burn up fuel pumps, wiring and relays. Contact whomever sold you your system or Holley directly. AGAIN This is Intermittent meaning on a recent trip I stopped 3 times and issued occurred once. After only running for about 15 minutes or so the system starts to fail stalling the motor. A problem since day 1 - YouTube Leave a comment if you've had this issue and how you resolved. Not to bandstand here but this is the point when where you bought your system is so important. But, whether your vendor provides you with tech support or sends you to Holley, I'd start by getting them a data log and asking for some insight. This only happens when coming to a stop and the idle is ramping down to the set idle RPM. The TPS will go red with a -15 and the AFR reads heating for a split second, then the idle kicks up to 2000RPM. That's a nice change of pace--a low idle issue! I have double checked everythingincluding fuel pressureand have followed the directions to a T.I plan on trying your 10 step process as soon as I get a chance. The AFR was pretty consistent around 13. knowledge with the sniper efi setup. At some point you come upon problems that evade the easy answers and this is a good example. I have a feeling it's something simple but I thought I'd ask you first before I inadvertently change something that affects other areas. The headache is the Acceleration Enrichment. That is likely just confusing the issue.Instead, choose whichever setup most resembles your camshaft and stick with that. First, let me congratulate you on your patience in letting the system learn. We offer some tips to help with that. A simple remove & clean will remedy this . Thanks again for your insights! If you datalog the Sniper ECU and see multiple overlapping traces for the same signal, you likely have RF-induced problems. Thank you. Confirm the placement of all wiring, ensure that the WBO2 sensor is positioned properly, etc. EFI System Pro had everything I needed for my EFI upgrade. such high fuel pressure. Strangely, what I've seen is that it idles too lean as the injectors are effectively shut off.Thanks again for the follow-up and glad to hear that everything is working well now. What must remain foremost in your mind is that the only thing that can cause the idle to increase is additional air getting into the engine. If I go any more it will ping. Also ensure the TPS Position returns to zero at idle, & the IAC Hold Position isn't setup too high. So something is triggering the ECU to be in Open Loop. Don't try to correct for the fuel. They tell you to ask call Holley. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. If that tested out okay then I can really guess that there might be some sort of intermittent, temporary RFI. If the issue persists, you may need to replace the IAC. 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. :-). So I have been doing the slow take offs and thinking that it would learn its way out. you have it set. They also worked with me on a sale I missed and price matched those parts. Sometimes an engine can produce enough vacuum to pull the secondaries open slightly. :-) Just don't let the parts go flying. 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. Thanks again Chris, your help has been invaluable.If anyone is considering going EFI, Chris is the man to chat with. 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. Relatively new Sniper EFI install on a '69 Mustang 302. But, if the idle is so high that it is making you crazy then you might try dropping that number just a bit. You can disable the idle spark control at the locations below. With select intake manifolds, the distributor housing and IAC valve on the back of the Sniper EFI throttle body are fighting for the same . I'll have to check again tomorrow. have noticed on the hand held is that Air/fuel Ratio rises to 20 +/- A/F and the Resistance results in heat and heat results in more resistance. Cheers Darren. I hope everyone enjoys this v. mean that the IAC is causing it. 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. I think you will find that it will learn its way through this. So the issue Im having is low idle. when things aren't working and this provides just that. After the start process, If the idle speed is higher than the target idle then the IAC should begin closing as long as the TPS is below 2%. It meets the target idle perfectly in either but if I lightly stab the throttle it tries to stall after slightly revving. Idle was back to normal but iac was at 0. It is working fine when you restart the car, controlling idle perfectly at 8 steps open so it is unlikely to fail when the car warms up--or correct itself instantly when you restart it..So, if you don't have any vacuum leak, and the throttle plates are fully closed, the only thing I can guess is something is causing your ignition timing to change. Though it started and ran good, it was dumping fuel and would not lean out to AFR set points. 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. (Note: in the original version of this post we had a section about checking the idle speed curve setting. Featured Products EFI - Fuel Injection $2.59 - $6,499.95 2179 Products View Parts Sensors The following are status commands and diagnostics for sensor and various parameters in the Holley software. If the IAC number is increased during this high idle, review the points about high idle from tuning issues. I was 20 minutes into a drive yesterday when all of the sudden the RPM increased not commanded. Capability Range: Advanced Should i adjust idle screw with the fans already on? Be aware that there is a spring behind there and a diaphragm that you don't want to tear. Have a look--I think this is going to allow you to fix your idle problem. Ultimately, it is about making the pedal softer, particularly at initial throttle opening. This car has never idled under 900 without stalling with 3 carbs and does the same thing with sniper edit. Is this normal ? Do I have to hook up sniper ac wire to relay or should iac pick up idle? However, I can't think of a single one that was because of low vacuum. Hang in there--you can do it. Idle quality is great, RPM is good, sometimes IAC is now between 2 and 5 exactly where it should be. If you remove the air cleaner entirely and the whistle continues then you can rule that out. Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. If you don't have a working coolant temperature sensor then it will never bring the idle speed down. We have shipped quite a few of these to customers in Australia and New Zealand so I know that there is becoming a good following there!We recommend this Inline 10-micron fuel filter to prevent problems like that. Target AFR at idle is 13.8%. I've been trying to correct that 1% small issue/annoyance. Hello, Chris, thanks for the help.I have not installed the software yet, and I'm having trouble with two cars. Idle Tuning is a very important part of tuning any EFI system, especially our self-learning units like Sniper or Terminator X EFI. 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. To keep it running in gear, I have to bump the neutral idle up just over 1000 RPM. Holley Sniper EFI Troubleshooting Mudford Garage 8.6K subscribers 38K views 3 years ago My Bronco with Holley Sniper EFI was running poorly. You mentioned going from 13.5 to 14.2 but you'd want to go in the other direction--maybe to 13.2. You will find a startup IAC percentage, an amount of time it holds at that percentage, and an amount of time it takes to idle down to the normal idle speed.By default, that number is 50% at normal operating temperature. Any help would b great. When I covered the IAC with my finger, the RPM dropped so low it stalled. Then why don't you Get On The List for Emails Straight From Our Pro? 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. Now, 1% on the TPS isn't a problem, but when it goes to 2% (which is inevitable if you have RFI moving it to 1%) then the IAC is going to go to it's hold position (30% by default) and the engine is going to rev up. 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. Capability Range: Professional Get On The List for Emails Straight From Our Pro? Is there away to program the ecu to compensate for this at start up. This is Intermittent meaning, I can run this test 5 times and IAC will function incorrectly 2 out of the 5 times. I guess we can't have everything. What should I be looking at to calm this down? I did check for the lightning under the hood but all was well. nothing stays steady. I can tell you that when things aren't working the way you wanted them to work that nothing beats knowing for-sure that you don't have a fuel supply problem. Could the IAC be broken/malfunctioning? It's pretty hard to get the header tubes glowing at idle with a lean AFR. Holly offers a very nice Analog-Style Fuel Pressure Gauge that is another option. would correct it (as it has for a multitude of other drive-ability issues) but this one little glitch seems out of it's range. The person I bought it from said he never could get it to run for more than a few seconds. That will at least tell you something. 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. If I read it correctly, the solution from the other thread seemed to fix a constant 300 or so RPM increase. What might cause the TPS to go to 2%? I think in some of the Wizards with the handheld it doesn't use 57.5 as the default. Ensure that the secondary linkage is completely closed (both visually and manually.). If you go too low then it may stumble or even stall when coming off of throttle. This increased idle speed is triggered by grounding the orange wire in the 10-pin I/O harness. If you are idling at 2100 RPM (based on a default IAC Hold position of 30%) and your target idle speed is 900, then the ECU is not going to try to idle down. School's out for spring break this week though so I'm covering for employees on vacation. Usually it wont stay on 0% very long and soon changes to another number like 1 or 2%. The biggest issue is these problems are intermittent meaning they do not occur all the time. I looking for your expert opinion. Turn the idle speed screw on the primaries in about 2-3 turns after it makes contact with the linkage and starts opening the primary throttle blades. 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. Now, in my lifetime of experience with Holley ECU's that seems unlikely, but this guy sounded really sharp and had nothing to gain by convincing me of his dilemma. I also tried changing roc/map to 8 from 15 again no change at all.My ve table is smooth and tuned I even changed my AFR to 13.5 from 14.2 and no change at all. Clearly, something is changing. I hold my foot steady in place it does this in 5 second cycles and if i let go of
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