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Thread: Leaning out/fuel cut at WOT.

  1. #1

    Default Leaning out/fuel cut at WOT.

    Hello all, sorry if this should have been in another thread. I have a '66 Chevy with a 327. I installed the Sniper system in March, it ran great! Went to go fire it up in August and fuel pump was SCREAMING! I called Holley and they sent me a new pump. Now here's my issue. With the new pump, the AFR sky rockets (30+) and the car stops accelerating at WOT around 4000 RPM. Just boom, no more, and starts bucking like a bronco. It's like the fuel keeps cutting, but I do not have a fuel cut on. Thanks ahead of time!
    https://www.dropbox.com/s/ptito1rr42...Data1.jpg?dl=0

  2. #2
    Join Date
    Dec 2009
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    Connecticut
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    If you had a major fuel system problem, you'll need to Clear the Learn Table (in the Fuel ICF).
    https://forums.holley.com/showthread...498#post221498 (Related Forum Thread)
    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.

  3. #3
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    Nov 2014
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    Default

    Post your Config File and the datalog, a picture doesn't help much.

  4. #4
    Join Date
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    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. #5

    Default

    Here's the Datalog:
    https://www.dropbox.com/s/xxl96i1dof...r_0010.dl?dl=0
    Here's the Config File:
    https://www.dropbox.com/s/bjdat31wvi...AA.sniper?dl=0

    I tried making sure the values where not the "old values". If I get it working again, I'll probably get the setup to change the timing with the controller. The engine has a decent cam, heads off of a '67 Vette, and the heads are ported & polished. I crunched numbers and think I should be around 376 HP at the crank, but it sure doesn't feel like it, thus why I went to the fuel injection. Still not feeling like it. Thank you.

  6. #6
    Join Date
    Dec 2009
    Location
    Connecticut
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    23,108

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    Quote Originally Posted by Old66 View Post
    I crunched numbers and think I should be around 376 HP at the crank, but it sure doesn't feel like it, thus why I went to the fuel injection. Still not feeling like it.
    That's wrong. You're supposed to determine what's wrong with the engine, before converting to EFI.
    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.

  7. #7

    Default

    The engine runs good, but I thought it was a fuel delivery issue. I got this so I could see what was going on. And to go fast.

  8. #8

    Default

    Do you have a fuel pressure gauge? Sounds like you're running out of fuel, but you need data to solve problems.

  9. #9
    Join Date
    Nov 2014
    Location
    Ont. Canada
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    Quote Originally Posted by Old66 View Post
    And to go fast.
    Fifty year old heads on a 327, probably not the best combination to go fast. You should rethink your goals and what you need to get there. If you think you have a fuel delivery problem, you need to put a fuel pressure gauge on it to see what's happening.

  10. #10

    Default

    It's a fresh built engine, sorry, forgot that part. Fresh meaning only 10,567 miles on it.
    I'll get a pressure gauge. If I had to guess, the pressure is dropping now that I really think about it.
    UPDATE: Okay, around 60 psi at idle & light throttle, and it drops below 10 psi when I floor it. The pump they sent me is Holley 12-920.

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