Mechanics

MISFIRE

2002 Ford Ranger

Engine Mechanical problem
2002 Ford Ranger 6 cyl Two Wheel Drive Manual 130000 miles

have 03 ranger 3.0 that is misfiring. Replaced coil and heads, had valve job done, checked compression all good still misfirers! What else could be wrong? Thanks
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Sessions10
December 29, 2009.



Is a code set?

Docfixit
Dec 29, 2009.
What does that mean?

Tiny
Sessions10
Dec 29, 2009.
Check engine light on?

Docfixit
Dec 29, 2009.
Yes and its flashing

Tiny
Sessions10
Dec 29, 2009.
Go to an Auto Zone have codes pulled then post

Docfixit
Dec 29, 2009.
Codes p0301, p0303 and p0305 which is a misfire in cylinders 1, 3 and 5, and they said something bout the emissions.

Tiny
Sessions10
Dec 29, 2009.
Was the same engine miss there before heads r& r? Has fuel injectors been checked on those cylinders? Is miss at idle and under acceleration? Have vaccum leaks been checked?

Docfixit
Dec 29, 2009.
It was not missing before. Could it be something electrical?

Tiny
Sessions10
Dec 29, 2009.
The cylindes that are effected indicate an intake leak. Check injector connections if good. Consider pulling top intake and give close look at gasket seal.

Docfixit
Dec 29, 2009.