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Thread: Engine “diesels” during hot start.

  1. #1

    Default Engine “diesels” during hot start.

    When I hot start my engine, it “diesels” while the dual sync is syncing with the ECU. What resolves this? Bigger prime shot? Smaller? Something else?

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    22,909

    Default

    It's often necessary to turn the ignition key on, wait for the WBO2 sensor to display AFR, then start
    the datalogger & engine. This allows you to determine if the engine AFR is excessively rich or lean.

    Hot starting issues are usually Cranking Fuel related (as long as the idle speed screw/IAC Position % relationship is properly adjusted).
    Ensure the idle speed screw on the throttle body, adjusted to achieve an IAC Position of about 5% at hot idle.

    If you take the time to study this, you'll be a startup tuning expert:
    http://forums.holley.com/showthread....6254#post36254 (Good Starting Advice Thread - Especially posts #2, #4 & #6.)

    Read the "TIP" in post #6 of this thread:
    http://forums.holley.com/showthread....6254#post36254 (Good Starting Advice Thread - Especially 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.

  3. #3

    Default

    Thanks, Danny.

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    22,909

    Default

    You're welcome.
    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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