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Thread: Cold Start -> Rich Mixture

  1. #1

    Default Cold Start -> Rich Mixture

    Occasionally, I have a cold start problem. It acts like a flooded condition. I hold the throttle open and crank for a while, then shut off the ignition/EFI and it usually starts. Otherwise, I have to leave it off for a few minutes.

    I have Target AFR set at 13.0 and Closed Loop on. When I start it with the coolant temp below 100°F, the Actual AFR starts out below 12.0 and works up to about 13.0, but the Closed Loop Compensation goes as high (low?) as -23%. After it has been running for a couple minutes (and the coolant temp goes above 160°F and the Learn Mode turns ON), the Actual AFR stays at 13.0, but the Compensation goes back to a more normal -1 to -2%. Any idea where this "extra" fuel is coming from?

  2. #2
    Join Date
    Dec 2009

    Default (Good Starting Advice Thread - Especially posts #2, #4 & #6.)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, 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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