holley sniper efi iac problems

Author: Matthew D. Lunsford When the truck was getting fed through the Quadrajet, my highway mileage was 10.5 to 11.0 miles per gallon. The IAC motor was replaced as was the manifold and throttle body gaskets trying to eliminate all vacuum leaks. When the truck was getting fed through the Quadrajet, my highway mileage was 10.5 to 11.0 miles per gallon. 3. Featured Products Sniper EFI $5.78 - $440.95 470 Products author Staff Writer 927 Posts An Article About Video tech Sniper EFI Videos Sniper EFI Tech Sniper EFI sniper Installation 1968 Beaumont. I had a blue wire coming out of the firewall that met this need, but it was already hooked-up to the + side of the coil and the Duraspark box. Everything is included to completely plumb your fuel system including; 20 feet of 3/8" EFI Hose, in-line fuel pump, post and pre fuel filters, return bulkhead, and all of the necessary fittings and hardware. The engine now idles right where it should (have it set at 750 RPM.) Find helpful customer reviews and review ratings for Holley 550510K Sniper Efi Master Kit-Shiny at Amazon . Put an end to cold start issues, hesitations, vapor . Extending wires with too small of a wire gauge will also result in the same damage. In Stock. . If you datalog the Sniper ECU and see multiple overlapping traces for the same signal, you likely have RF-induced problems. A 5/16 line is big enough to feed 600+ hp when the fuel pressure is 58 psi. CJ2A #29110 "General Willys" MB #204827 "BAM . 1bbl Holley Sniper EFI system. I decided it was the IAC by taping off the IAC port on top of the TB, (Which makes it NOT work), and turn up the idle screw to open the blades oh so slightly. 350. Please try again later. Using the correct length carb stud and nuts, tighten the Sniper EFI throttle body down progressively in a "criss-cross" pattern (60-80 in.lbs.). Filter. Place the Sniper EFI throttle body on top of the new flange gasket on the manifold. We called Holley tech 3 times, and got 3 different people in 2 days. This is a great time to visually inspect the overall Sniper EFI install. The other down side is that it appears availability is a problem. Black 1983 CJ-7 / 258 w/ Sniper EFI / T4 / 2.5" lift / 32" BFG mud terrains / Chrome 15x10 Cragar Nomads. . It is reliant on the data acquired by the included wideband oxygen sensor. if not call holley or the jokers that sold you the unit. The engine shouldn't stall when blocking off the IAC air inlet port (at hot idle). Alexr54. I've updated the firmware to it's latest version, start all over with default settings and the problem still exists. We recommend at least a 3/8" feed line and 3/8" return line. Billet Aluminum Black Sniper EFI Throttle Body. If you have a failure, you replace the entire throttle body. Author: Matthew D. Lunsford 4150 Sniper EFI (550-510 Shiny, 550-511 Black, & 550-516 Gold) 2 . The IAC, TPS, MAP are all integrated into the throttle body. 1963 Chevy II 400 - Pontiac OHC 230 - Powerglide - Holley Sniper. Its very common for the Holley Sniper to have coolant temperature sensor problems from the very beginning straight from the Holley factory. Sort. Holley EFI Idle Air Control (Iac) Valve Motor. Engine is almost new (bought 3 years ago). Put an end to cold start issues, hesitations, vapor . The learn function will offset the base fuel table until the closed-loop compensation only requires minimal changes. The Sniper Stealth 4150 ECU is capable of fuel map self-learning and ignition timing control, improving idle stability . 5.0 out of 5 stars works great. 1970 F100 SBF motor EMI problem from Sniper distributor. New IAC and TPS did not fix the problem. Timing is verified with a light, fuel pressure is good, idles well. fuel inlet must go to one of the three options for the inlet fitting on the 4150 Sniper EFI. That would require that the IAC be replaced. Reactions: . This is a great time to visually inspect the overall Sniper EFI install. Jim CJ-2A - 81299 Greaser007 . 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 . So, this is what it takes to put a Sniper on a small-block Ford. As . An adapter harness is available to connect this distributor directly to the Sniper EFI throttle body. I purchased Holley 860001-1 Sniper EFI Throttle Body 92 mm. Recently installed a holley sniper efi system on my 67 6cyl easy install and system setup with the handheld. Mainly the idle will not stay level. May 20, 2017 #56. 78 Malibu, 402 B&M 174, eddy heads, 232/ 236@.050 598/610 lsa112, 5200 stall, th350, sniper, 9" with 3:70's. 26 X 8.50-15 M/T slicks. Holley was not too helpful as all they really did was suggest 12 million things that could be wrong. eliminate the box to make sure its not your noise source, and go from there. You've got it running and warmed up but now you . it should be in there. You can re-enable this after you have completed this idle speed adjustment process. Holley came out with the Sniper EFI 4150 not long ago, and it made quite a splash. The IAC, TPS, MAP are all integrated into the throttle body. #3 Engine Ground There should be 1 AWG or larger ground strap going direct from the battery to the engine. no problem. Newest; Items 1 - 1 of 1 Items. As discussed on the phone, sent you a picture of the coil driver. Hopefully someone here with more experience can help me out. This video shows the engine below and above operating temps and with and without the iac p. Idle Tuning is a very important part of tuning any EFI system, especially our self-learning units like Sniper or Terminator X EFI. Introducing the Holley High-Horsepower Super Sniper 4150 EFI. 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. . The first 250-300 miles were amazing as the Sniper EFI worked flawlessly. also double check your rotor phasing before trying again. There was a problem filtering reviews right now. It felt like it was flooding out at low speed, low RPM. The other down side is that it appears availability is a problem. extremely rich mixture, which could cause drivability problems and severe engine damage. Mar 18, 2019 . I have been having some issues with my CJ7 with the i258 running the Sniper Holley EFI 2BBl BBD. So you installed your Holley Sniper. Timing settings are 15 degrees at idle, 30 WOT, 32 cruise. I called Holley support. In Stock; Default; In Stock; . HyperSpark Ignition for Sniper EFI. $75.77. Holley's Sniper line of self-learning throttle-body EFI systems has been a value/performance breakthrough, and its new line of Super Snipers takes functionality up a notch. One thing I noticed is that with any partial throttle, the timing control readout shows the timing going to the "cruise" setting. Apr 13, 2017. CJ2A #29110 "General Willys" MB #204827 "BAM . The Sniper EFI master kit contains the most complete EFI fuel system on the market. Install the throttle linkage to the Sniper EFI throttle body. Timing settings are 15 degrees at idle, 30 WOT, 32 cruise. check tps/Throttle blade postion and IAC positions. Only show this user. . My system inevitably had an ECU failure in under 500-miles, and the car was towed home twice during that time period. You can use the existing 5/16 or 3/8 hard line that is in the car without any problems. A straight-forward setup process is detailed in the full installation manual. They're pretty good about customer service. Everything is included to completely plumb your fuel system including; 40 feet of 3/8" EFI Hose, in-line fuel pump, post and pre fuel filters, return bulkhead, and all of the necessary fittings and hardware. I have a Blueprint 347 engine with Holley Sniper EFI and F5 gas pedal, throttle cable on the top hole position and I'm finding it a bit sensitive, almost like and on/off switch. Stock looking, and fairly stock sounding. To dial in an RPM you block the IAC valve and adjust to where you want the idle rpm then let off the IAC valve that way the IAC is only making minimal adjustments to level out your idle. Sort. . 72 Chevelle Malibu. At least in these times. Ideally you want it between 2-7 when it at operating temperature. Nov 27, 2016. IAC Motor Included: Yes . The Sniper needs a "clean" 12V wire that is hot in Start and Run. I absolutely love it. Found out that it was due to rfi/emi. No more Holley injection Holley said there . After installing the Sniper and running for a few weeks with the initial air/fuel settings as mentioned, I saw roughly 1 ½ to two-miles per gallon increase. I am planning on removing all fuel lines (5/16") anyway and replace it with a 3/8" tube. Here I am 3 years later still having problems. Holley Sniper EFI 12-300 Holley EFI Fuel Tank Modules - 255 LPH - Camaro / Firebird / Nova • This in-tank fuel pump module is a high-pressure unit that flows 255 liters per hour (LPH) and is capable of supporting electronic fuel injection (EFI) engines producing up to 550 horsepower • A pre-calibrated fuel-level sending unit designed to . Are you experiencing random high idle with your Sniper EFI?Could be caused by the rear throttle plates pulling openHeres the fix! 72 Chevelle Malibu. The Sniper EFI system looks at the closed-loop fuel compensation required to reach your target AFR. Buy NEW HOLLEY SNIPER EFI SELF-TUNING KIT,800 CFM,BLACK,4BBL,FUEL INJECTION CONVERSION: . I have read on the holley forums they've had some problems with IACs on their other sniper units. Does anyone use the second or third hole positions on . If the IAC is large-ish, blocking the IAC air inlet will cause the car to stall (at idle). It felt like it was going to stall out at stop. I know mine wanted to idle high when I first installed it because I had used the quick start guide and skipped over that part. . HOLLEY SETUP USED: 600 HP Sniper in shinny finish. The problems start over after a few minutes of driving. Muncie M20. It also had indentations from the old carb that didn't match the Sniper base. Created a document which included all the spare parts (non-Holley, OEM) on the Holley Sniper EFI Owners Group on FB before I was banned (by Facebook). Sniper EFI Idle Tuning. An adapter harness is available to connect this distributor directly to the Sniper EFI throttle body. Getting the throttle blades and IAC to work together will keep your fuel injected hot rod running smooth and predictable. One of the signs of a vehicle with a rough idle is a faulty Idle Air Control (IAC) Motor. The wiring was a bit of a mess. There are two ways to go here. This is the position the IAC motor will be at during cranking and immediately after the engine starts. It's economically priced so you can have all the benefits of EFI and still have money to finish or upgrade the rest of your ride! 4.5 out of 5 stars . Option 1 is to purchase and install one of the Holley EFI Dual-Sync Distributors on your engine. Symptoms of RF Interference in Sniper ECU's The first thing to realize is that RF interference can manifest itself in ways that will have you suspecting and replacing everything in the system. Holley 860005-1 Sniper EFI Throttle Body 102 mm. I went with all the Holley fuel pump and accessories and my car wouldn't even start. . Check Your Wiring #2 Wire it properly… Most important! They said the IAC jumping around some is normal. Those guys have helped me a lot in my Sniper adventure, lots of good info there. Yeah, the Sniper IAC can be fun to get right. These full-featured throttle bodies are easy to install, can support a lot . As I would slow down for a stop sign or stop light, the car would run really rough and the idle did not want to come down. Muncie M20. Buy Holley 860005-1 Sniper EFI Throttle Body 102 mm. Finished installing the Sniper on my 1969 Fairlane a few weeks back. Also exhaust is replaced, no leaks. Engine running at various rpm's, and compared/sync'ed ECU read timing to balancer.

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