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1997 Ford Ranger

Question: code p0304

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tlew10, 2.3L 4 Cylinder, Huntsville, TX, April 22, 2010, 14:03
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have replaced cat, o2 sensors, plugs, wires,inj,coil packs,pcm, cleaned intake and egr tubes, put fuel stem cleaner in, checked compression and cyl. leakdown, all were good. when trk starts to miss counts jump up 22000- 28000 a fram when it hits 1 million light comes on and trk smooths out. at loss here please help

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  • Answer #1

    Aggieland Automotive (2179 Answers) , College Station, TX - (866) 249-9910
    aggielandautomotive December 29, 2010, 13:01
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     Enthusiast

    Incorrect oil weight can cause the lifters/lash adjusters to intermittently over-extend resulting in the valves holding open and causing a loss of cylinder compression.
    Change engine oil and reassess the condition. Install the recommended oil weight (5W-30).

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