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Thread: Maybe a fuel issue but I'm unsure.

  1. #1

    Unhappy Maybe a fuel issue but I'm unsure.

    Hi All. I have a 1968 Camaro with a Terminator/Stealth EFI fitted to a 396 stroker. Maybe a fuel issue but I'm unsure. I have had an issue in the past with the WBO2 sensor, but this is now sorted only now to have another issue that is doing my head in. When driving under hard acceleration from 1st gear to 2nd gear to 3rd gear at about 4000 RPM, each shift the engines then goes into some kind of limp mode. Plus when hard cornering or doing a spin U-turn. Each time the car goes into this limp mode, I push the clutch in wait a few seconds and it comes good. Thinking that car was low fuel I've filled the fuel tank almost to the top only to experience the same issue. Any suggestions will be greatly appreciated.

    Plus does anyone know of a place in Melbourne Australia who has good knowledge of the Terminator/Stealth EFI? I'd like to get my EFI system setup properly. Thank you and I look forward to all replies.
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    Last edited by GAS; 06-11-2019 at 08:19 PM.

  2. #2
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    What fuel tank, pickup, etc., are you using? Gary
    Regards, Gary

  3. #3

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    Hi Gary and thank you for replying. I'm running the setup that came in the Master Kit (550-444K). The fuel tank is stock. I also just posted a couple of pictures from the handheld display unit. I hope that they may help.

  4. #4
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    I think others will have some better idea about the data, but the fuel pressure of -11 is of concern. Does this only occur at 4000 RPM? What maximum RPM do you turn it to? Gary
    Regards, Gary

  5. #5

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    Hey Gary. The fuel pressure reads on the handheld -11, but when you attach a pressure gauge it reads 48 psi. The issue occurs even when cruising along at 110K after an hour or so. The engine is quit happy and revs out easily to 5700, but after a couple of gear shifts it has the hissy fit. (Plus I need to back off - going a bit too fast.) Mate, I'm starting to think that the fuel is cavitating.

  6. #6
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    Quote Originally Posted by GAS View Post
    The fuel pressure reads on the handheld -11, but when you attach a pressure gauge it reads 48 psi.
    If you don't have the fuel pressure transducer (LINK) installed, then the fuel pressure channel will read negative (it's normal).
    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

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    Thanks Danny. I will arrange one ASAP. Do you have any thoughts on my other issue? Sean

  8. #8
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    Not at this time. You'll have to record & review a datalog with the fuel pressure transducer installed.

    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 Global 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 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 Global 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 Global File screen.
    Then click & scroll anywhere on the datalog, and watch it playback on your Global File (EFI software).
    http://documents.holley.com/techlibr...9r10543rev.pdf (Holley EFI Datalogger Instructions)
    https://forums.holley.com/showthread...s-amp-Datalogs (Datalog & System Log Information - Read "NOTES")
    https://www.youtube.com/watch?v=iqHO...C6FEA0BB99AF17 (How To Record & Email A Datalog)
    https://www.youtube.com/watch?v=q7OZUXLRS1Q (How To Record A System Log & Diagnose A No-Start Condition)
    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.

  9. #9

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    Cool. Thanks Danny I get onto that. Do I only need the one pressure sensor or do I need one for fuel and one for oil? Plus would you suggest to install a Holley 12-300 EFI fuel tank module? Thanks for the info Danny. Sean (GAS)
    Last edited by GAS; 06-12-2019 at 02:52 AM.

  10. #10
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    Quote Originally Posted by GAS View Post
    Do I only need the one pressure sensor or do I need one for fuel and one for oil?
    The oil pressure transducer is optional, but it's great to have that data when viewing a datalog.

    Plus would you suggest to install a Holley 12-300 EFI fuel tank module?
    That should work fine as long as the tank doesn't need a filter chamber or baffles.
    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.

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