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What is this ticking/tapping noise?

Old 05-30-2010, 08:24 PM
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my 02 ws6 does it too but goes away after 30 minutes of driving.
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Old 08-21-2010, 04:51 PM
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Engine tapping when cold

I have the same problem with my 02 Z28 so I went to GM and a got a tech bulliten that says the O-ring between the oil pump and the pickup tube cracks thus starving the top end the only thing I can think of is when the engine warms up it swells the O-ring just enough to allow more oil to reach the top end. The bulliten says it is nothing to worry about but to me if the engine is getting starved of any oil its worth worrying about and plus its annoying.
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Old 09-22-2017, 08:24 PM
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Re: What is this ticking/tapping noise?

According to gm tsb its an o ring in the oil pump pick up needs to be replaced
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Old 09-24-2017, 02:32 PM
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Re: What is this ticking/tapping noise?

8-21-2010
Originally Posted by engineguy View Post
I have the same problem with my 02 Z28 so I went to GM and a got a tech bulletin that says the O-ring between the oil pump and the pickup tube cracks thus starving the top end the only thing I can think of is when the engine warms up it swells the O-ring just enough to allow more oil to reach the top end. The bulliten says it is nothing to worry about but to me if the engine is getting starved of any oil its worth worrying about and plus its annoying.
9-22-2017
Originally Posted by Adam Phillips View Post
According to gm tsb its an o ring in the oil pump pick up needs to be replaced
Is there an echo in here?

If so, took 7 years for the reverberation to come back.......
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