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Originally Posted by zanegrey
check timing
check and recheck oil pump timing.
check compression on all 4 ..
also check fuel and air filter.
clean out breather element
check fuel tank for contamination.
check and clear strainer on fuel pump.
remove and check temperture sending sensor.
oil change and filter..
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compression is fine. Fuel and air filter have both been replaced and adequate air flow through breather inlet has been verified. The surge is too rythmic to be trash in the fuel...it's very predictable. Bad gas can give some wierd problems, but they are usually not predictable and/or repeatable. We have put gas treatment to no avail just for good measure, but again, I don't think that's it. The PID on the coolant temp sensor reads fine. An oil change, while always a good idea, is not going to fix a surge.
I am pretty sure that the mechanic verified proper timing. Just out of curiosity, however, did you have a particular reason for suggesting oil pump timing (as in...some past experience) or were you just throwing out some random ideas for me to try?