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I agree with hcmq; by the way, that seal on the gas cap must be good if it hisses at you.
From what I've seen and understand, if you leave that cap loose, the check engine light illuminates because the system senses the pressure in the tank. If the pressure is too low, the check engine light comes on because your vehicle is contaminating the atmosphere. Weird how EPA laws work!
I have also seen other vehicles (Chevrolet van) throw codes when a rough idle is encountered and check engine light illuminated, caused by a loose gas cap. I expect the same happens with the F150.
Have you run any gas treatment/gas drier through the tank yet? Perhaps you have a condensation accumulation in the tank. I don't use alcohol, I'm on an acetone kick right now. You might try up to 8 oz. of acetone or one bottle of your favorite brand of gas treatment to 1 tank of gas.
Good luck!
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'99 Scab; tires, wheels, 4.6L, auto., K&N; Accel; 23 mpg overtuned, underdriven, high-octane, low-drag unit.
Last edited by cliles55; 11-09-2004 at 08:46 AM.
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