Quote:
Originally Posted by pmead
I just started car and checked exhaust temps at each exhaust flange and they are all close to the same. No obvious cylinder not firing. I blocked the exhaust with a rag momentarily to check for exhaust leak, no change in sound. Tomorrow I will start with plugs and then check compression or pull valve covers. Would a broken valve spring create this problem? I do not get any smoke. It sounds more like a small exhaust backfire and is in rhythm with the rpms. What are the symptoms of broken head studs?
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Check your plugs, then the valves, maybe a broken spring? Could be head studs too, have they ever been replaced? Look for oil build up where the cylinders meet the case, if you have some it could be bad news, head studs.