2004 tauras starts real easy, but runs ruff for 2 or3 minutes w/ revs all over the place then suddenly run fine last a long time

Asked by Dec 05, 2015 at 12:56 AM about the 2004 Ford Taurus SE

Question type: Maintenance & Repair

Occasionally I will get a check engin but it's always reads O2 sensor out of
range or something like that. I think injectors are leaking into cylinders when
not running and computer thinks I'm running rich then over compensate
causing a lean condition is this even possible?

1 Answer

229,055

You can have a leaky injector, but you would notice fuel out the exhaust and glowing cats. I suspect a vacuum leak, check all your hoses off the intake and crankcase hoses. When it gets warm, the crack probably seals. Start the car cold, open the hood and listen for hissing, move/bend some hoses around with your hand to hear if the idle changes or you hear a leak. What are the codes you are getting? P0xxx?

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