knocking and ticking

[Hayden]

Hi my 1990 commodore has a small knock and tick when idling. The small knock seems to be coming from under the car and the tic is near the top of the engine. Only does it when idling. Any idea?

Topic

[Cameron]

Which engine do you have in the car? The 3.8 V6 or the 5.0 V8 ?

[Ingvar]

tick at the top is usually rocker arms and for the year, you likely to have hydraulic lifters for push rods. My wild guess is it’s push rod engine, for the year. So run can of Seafom through crankcase for 500 miles and change oil with 10W30. It’ll loosen lifters.
As of knock at the bottom… I have too many guesses to type. Can be oil pump, oil pump pick up unit in oil pan loose, tie rod bearings, main bearings.. IF it’s coming from the bottom. Metal is excellent sound conductor. Can be very deceiving.

[Hayden]

[quote=”cam0888″ post=113239]Which engine do you have in the car? The 3.8 V6 or the 5.0 V8 ?[/quote]

the 3.8 v6

[Author]

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