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GMC Forum: Tapping sound from Engine
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Old 12-21-2011, 09:55 PM
drokk drokk is offline
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Join Date: Dec 2011
Posts: 2
Unhappy Tapping sound from Engine

2000 Jimmy Lifters are tapping while engine cold till it warms up after several mins than the tapping goes away.Is this the sign of a major issue or does it sound like the lifters are just sticking? I am also losing coolant but no signs of a leak and no apparent head gasket leak symptooms either.I had the coolant system flushed out because it was terribly gubked up.This vehicle has 196,000 miles on it but other than these issues is in excellent condition.Suggestions???
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Old 03-15-2012, 12:12 PM
hobbie2k hobbie2k is offline
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Join Date: Mar 2012
Posts: 5

Have you checked the intake manifold gaskets? They are common to fail on GM V6s from the periods and they can cause mystery coolant leaks. The light-brown gunk in your radiator is probably oil, you can also check for moisture in the oil by looking for that same gunk under the oil cap, or even just water under the cap. Any of those things would indicate a leak in the intake manifold gasket. If there is a leak, you should get it fixed soon because coolant in the oil can damage your engine internals (bearings in particular), and oil in the coolant can clog your radiator, heater core, and coolant passages, leading to overheating.

As for the ticking sound, my Jimmy does it too, with only 97k on it. It should be okay, as long as it goes away quickly, but it can't hurt to run a cleaner through the oil next time you change it. Hopefully that'll loosen things up.
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