Question about 1998 Ford Explorer

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My 1997 ford exporer sport 4.0 L runs very rough. It started out with a slight miss, then worked its way to running so rough that I almost called a tow truck to take it home. Heres a list of things Ive replaced in the last 6 months trying to fix the problem: Crankshaft position sensor IAC Valve throttleshaft positioner sensor mass air flow sensor (checked out ok) Upper and lower manifold gaskets fuel filter (never again!) fuel pump spark plugs plug wires (checked resistance-ok) replaced 1.5 yrs. ago cleaned throttle body cleaned fuel injectors (and replaced 2 witrh low resistance) air filter checked all vacuum lines it runs the same as before except only now the check engine light is finally on. I had it put on a code reader at a professional shop when the miss was distinctive but tolerable yet check engine lite wasn't on. No error codes were present.

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SOUND LIKE A VACUUM LEAK AT THE INTAKE MANIFOLD.CHECK ALL VACUUM HOSES ON INTAKE.REPLACE FUEL FILTER.COULD HAVE LOW COMPRESSION WORN OUT VALVES.

Posted on Mar 23, 2011

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Posted on Jan 02, 2017

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