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Old 11-15-2021, 10:11 AM   #2
billr
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Join Date: Jul 2013
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Default Re: specifics on compression testing, P0301

Did you hold the throttle wide-open while doing these crankings?

Run it for a bit, then take compression again; and be sure the battery is good enough that voltage doesn't drop below 11V while cranking. This time, don't do any of that "adding oil" routine. That is only confusing things. Yes, adding oil can help determine if the rings/bores are worn, but that is rarely the case with these engines because of their oil burning issues. And, if you add too much oil, compression will get falsely raised, possibly even to the point of locking the engine rom turning!

PS: Five compression strokes is enough to get full compression on a good cylinder...
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