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Thread: Fox system starting issue.

  1. #1

    Default Fox system starting issue.

    Fox body kit on a 331 stroker. Occasionally, like 1 in 10 starts, when cranking, it'll act like the first spark is fired too early and fights the starter. It's pretty violent. I release the key and the engine is stopped, not running. Then when I try to restart, it cranks a little longer than normal then fires off. For more detail, when cranking, it takes almost a second for it to fire off. I figure it's looking for the cylinder #1 identification tooth on the TFI distributor before firing fuel. What could be causing this occasional bad start attempt?
    Last edited by Bryant; 10-28-2020 at 06:33 PM.

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    26,987

    Default

    Datalog it, RPM Error?
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 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, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 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 M/T Street Comp tires.

  3. #3

    Default

    I'll datalog every start I can going forward till I catch it. I'm unsure on how to zip a file for attachment, but I'll figure it out when the time comes. Here's a datalog of the bad start:
    badstart.zip

  4. #4

    Default

    The above post has a bad start datalog in it. It was even worse this morning. I noticed the engine temp on the display was 83°F when its a 50°F morning and the car hasn't ran for two days. The engine stable operating temp on the handheld is the same as it was before. I don't have the temp gauge I had on the carb, due to lack of available ports for two sensors. I will be adding a port to be able to compare. It looks like I need a better quality coolant temp sensor or need to rescale it for accuracy if that's possible. Can just the coolant temp being off 30°F when cold cause hard starting?

  5. #5
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    26,987

    Default

    Quote Originally Posted by Bryant View Post
    Can just the coolant temp being off 30°F when cold cause hard starting?
    Yes, if it's off by 30°F. Replace the coolant temperature sensor. Holley 534-10 coolant temperature sensor, or Standard Motor Products TX3 (LINK/LINK). If not, then fix your cooling system.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 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, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 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 M/T Street Comp tires.

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