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Old 12-11-2010, 09:26 AM   #5
pappyam
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Re: 97 Jimmy4.3L extreme engine vibration, random misfire code

I don't know why you would suspect a bent pushrod. I would think you would have heard a mechanical noise when you were coming back from your trip. It is true that, if the valves don't open,you will not get any compression on that cylinder. I would still start with a leak test and if you don't find anything out of the ordinary, I would investigate further (Spark & gas) before pulling the head, unless you have good reason to suspect a bent pushrod. Take this advice with a grain of salt as I am not a pro mechanic but rather a DIY wrench!
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