There is a knock, tap, coming from engine. I've ruled out lifters. But I can't figure where noise is coming from. Goes away sometimes when engine is warm

20

Asked by Nov 22, 2015 at 09:51 PM about the 2006 GMC Sierra 1500 SLE2 Crew Cab 4WD 5.8 ft. SB

Question type: Maintenance & Repair

7 Answers

58,445

If the tap quietens down when engine warms up,it will be a weak lifter.

1 out of 1 people think this is helpful.
20

That's what I first assumed. it used to stop when engine warmed up, now it's continuous, but does get quitter. I put marvel mystery oil in it. I have had luck in the past with that freeing up lifters. Do you think it could be piston knock?

1 out of 1 people think this is helpful.
19,225

did you inspeck the rocker arm/s

20

That was my next step. Just trying to get other opinions. Thanks

58,445

A piston knock would not go away,leaning more to weak lifter.

1 out of 1 people think this is helpful.
31,495

How did you rule out the lifters?

20

It just has a deeper sound than a lifter. I may be wrong

1 out of 1 people think this is helpful.

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