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1999 Jeep Cherokee Question: PO305 error code



Visitor, 4.0L 6 Cylinder, Hanover, PA, July 21, 2010, 07:37

Jeep has started to idle rough. OBDII code reader says PO305 (#5 cylinder misfire). Changed plug and wire, no help. Problem only at idle.

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  • Answer #1

    July 21, 2010, 07:43

    check the injector and do a compression test. lots of problems with exhaust valve seats going bad.


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    Visitor, July 21, 2010, 08:15

    Compression check done. O.K. How do you "check" the injector? What about the EGR ?

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