code p0304

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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

tlew10 in Huntsville TX

Apr 22, 2010

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What are the best Ford repair shops?

RepairPal Certified shops can diagnose and repair your 1997 Ford Ranger. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

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code p0304

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tlew10 in Huntsville TX

Apr 22, 2010

1 Reply

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aggielandautomotiveon Dec 29, 2010

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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Popular Answer

What are the best Ford repair shops?

RepairPal Certified shops can diagnose and repair your 1997 Ford Ranger. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.