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Brian 4/19/2010
1988 Ford F-350 XLT Lariat 8 Cyl 7.5L - Engine
Ford F-350 running rich
1988 ford F-350 EFI 7.5l V-8. Engine running so rich it fouled all 8 spark plugs. Changed Cap Rotor Plugs and Coil. Truck will start but idles rough. Smooths out at high rpms. A lot of black smoke. No check engine light on. Air filter clean.
1 Answer
  • HouseCallAuto
    HouseCallAuto 4/19/2010
    Verify the fuel pressure with a gauge against specs. This can store fault codes and if I were fixing the truck I would hook up my scanner and read them first. Does this have fuel injection or a carburetor? It was sold both ways.
    Brian 4/20/2010
    Fuel injection.

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