Other
mis fire

Question Description

i nhave a 2001 ford expedition. with a 5.4 liter engine. my computer is telling me that cylinder 3 is mis firing. i changed the spark plug, coil, and injector. and i did a compression test, no leaks. the engine doesnt smoke or make noise.

Final Answer

check your crank sensor, and cam sensor, last but not least check oxygen sensor, u should have 3-4 depending on your vehicle specs

jimmy72 (1)
University of Maryland

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