Page 2 of 4 FirstFirst 1234 LastLast
Results 11 to 20 of 35

Thread: Buyers Remorse - Sniper EFI

  1. #11
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    22,684

    Default

    If you'd like to eliminate the IAC valve as a problem, temporarily block off the IAC air inlet port with a strong piece of tape. Also, ensure both throttle shafts fully return to idle when this happens. And the TPS Position % too.

    Originally Posted by Danny Cabral
    Quick Datalogger Information:
    Always provide data, not just symptoms. Is the AFR & ignition timing optimized? Overlay the datalog onto your Config File.
    Ensure the Target A/F Ratio table is properly programmed for your engine. Ensure the ECU is "Learning" (Learn Table LINK).
    Scroll through the datalog to the problem area. Then look exactly where this happens on the Base Fuel & Timing Tables. Scrutinize:
    RPM, MAP, MAT, TPS, CTS, IAC, Target AFR, AFR Left, CL Comp, Ignition Timing, Duty Cycle, Fuel Flow, Fuel Pressure & Battery.

    Using the Holley Sniper EFI software (LINK), look at where the live cursor moves to during this occurrence, and
    manually tune that area of the Base Fuel Table (enrich or lean) & Base Timing Table (optimize ignition timing).


    I find the most helpful datalog function, is overlaying the datalog on your Config File.
    I'm in the habit of using the datalog Overlay feature every time I review a datalog.
    Click on "Datalog" (on the top Toolbar), "Activate Overlay", then "Open Data Log".
    You can literally "playback" a recorded event, and watch it as it happened on any screen.
    Minimize (shrink) the datalog window, and move it to the bottom of any Config File screen.
    Then click & scroll anywhere on the datalog, and watch it playback on your Config File (EFI software).
    http://documents.holley.com/techlibr...9r10543rev.pdf (Holley EFI Datalogger Instructions)
    https://forums.holley.com/showthread...s-amp-Datalogs (Datalog Information - Read "NOTES")
    https://www.youtube.com/watch?v=iqHO...C6FEA0BB99AF17 (How To Record & Email A Datalog)
    https://forums.holley.com/showthread...7531#post77531 (Closed Loop Datalog Tuning - Posts #2, #4 & #6)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  2. #12

    Default

    Quote Originally Posted by bingo2 View Post
    Just a few random thoughts on this. You haven't mentioned the make of vehicle, the age of the vehicle, or the type of engine where the Sniper is installed.

    Will the engine restart once it cools down? What coil are you using? Coils are weird little guys and can operate perfectly and test good until they get hot.

    You didn't mention at what temperature your cooling fan kicks on; does the shutdown event coincide with the cooling fan turn-on? Do you have the Sniper controlling the fan or are you using some other method like a toggle switch or stand-alone controller?

    If the shutdown event is tied to the fan turn-on; is the alternator up to the task? Computers don't like huge voltage swings and even though you have the Sniper wired directly to the battery, a fault in the charging circuit could cause issues.
    To answer your questions: Car is a 1968 Impala, engine is a 496 stroker with a T56 manual transmission. I'm using a Holley dual sync with timing control, an MSD 6AL, and an MSD Blaster coil, and it will start back up after it cools down. The Sniper is controlling the fan; it turns on at 190°F and back off at 185°F. The fan was running when this happened. The alternator is a 140 amp CS Power Master. Everything under the hood is brand new. I'll have to try and get this to happen deliberately to get a datalog. It happened too quickly for me to react.

  3. #13

    Default

    Can you post your Config File?
    69 Camaro
    400 SBC, ProCharger D1SC

  4. #14
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    22,684

    Default

    Originally Posted by Danny Cabral
    For further assistance, post your Config File and a short datalog of this occurrence for us to analyze.
    Also, review the datalog and inform us of exactly where in the datalog (time/seconds) the problem occurs.
    Datalog & Global Files can be linked to a document hosting website. I use Dropbox.com.
    Files can also be "zipped" (compressed zipped folder) & attached directly to a forum post ("Go Advanced" & "Attachments").
    Your Config File is in the "Documents", "Holley" folder, "Sniper" folder, "Config Files" folder (.hefi file).
    Your Datalogs are in the "Documents", "Holley" folder, "Sniper" folder, "Data Log" folder (.dl file).
    Someone will analyze/troubleshoot the problem & offer advice.
    https://www.youtube.com/watch?v=iqHOtDNiTNA (How To Record & Email A Datalog)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  5. #15

    Default

    Thanks for all the replies. I'll work on getting a datalog of the event and I'll post that and a Config File as soon as I can.

  6. #16

    Default

    I make it a habit to datalog just about every time I drive my truck. Once I’m satisfied and consider it fully tuned, I won’t be as diligent. The supplied SD card can hold a lot of datalogs.

  7. #17

    Default

    Drove it around my neighborhood in 1st gear with the electric fan relay removed. Coolant temp got up to 200°F, but no dice. Did not happen again. Will try again this evening.

  8. #18
    Join Date
    Nov 2014
    Location
    Ont. Canada
    Posts
    1,384

    Default

    Whenever I hear, it stalled when it was hot but when it cools down it will run again, I think of fuel delivery. Fuel pump could be getting too hot.

  9. #19

    Default

    OK, it did it again when I stopped for gas. I left the car running and after a minute or so it started running choppy, etc., and stalled. Let it cool off for 10 minutes and it fired right up. I'm not sure how much good the datalog is going to do; the only data I captured was after it started acting up.

    To the post above: The pump is mounted on a bracket just aft of the fuel tank. It's not enclosed or anything. I guess this could possibly be the reason, but would that explain the IAC going up to 30%? Config File and datalog attached. Thanks for any replies.

    ETA: It will not let me attach either file - it says both .sniper and .DLZ file types are "invalid"? I need a beer.
    Last edited by 68WASAGOODYEAR; 09-22-2019 at 07:37 PM.

  10. #20

    Default

    Did you have the fan relay reattached when you went for fuel? Did the stall coincide with the fan coming on; if so, you've found your culprit.

Page 2 of 4 FirstFirst 1234 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
About us
Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR® Sprint® Cup team and nearly every NHRA® Pro–Stock champion for four decades. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies - Hooker Headers, Flowtech Headers, NOS Nitrous, Weiand, Earl's Performance Plumbing, or Diablosport - Holley products can give you the edge you need over the competition.
Join us