Tapping valves on 2002 Monte Carlo

TOM2448

MEMBER
2002 CHEVROLET MONTE CARLO

Recently the engine started tapping on my 2002 monte carlo with 65k miles. It occurs upon starting and goes away after running at 3k rpm for 1 minute. Not low on oil and just changed oil and filter and still have problem. (Changed oil regularly) If adjustment is needed, why does noise go away.

Sunday, October 14th, 2007 AT 3:58 PM

3 Replies

CHEVY22

MECHANIC
1,375 POSTS

Hey tom,

if it sound like the whole valve train is making noise you could be looking at a lifter or two bleeding down and pumping up after you start it again. Very common problem on your vehicle and may other gm's

jim

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Sunday, October 14th, 2007 AT 4:01 PM

TOM2448

MEMBER
2 POSTS

So what causes it now that didn't happen for 5 yrs? Do I need them replaced or is there an additive I can add to prevent the bleed off? Will changing the oil viscosity from 5w30 to something else eliminate the problem?
Thank you very much!

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Monday, October 15th, 2007 AT 12:33 PM

CHEVY22

MECHANIC
1,375 POSTS

If it is infact the lifters what happens is they are internally valved and sealed and supposed to hold pressure but after time the seals and valves wear causing this problem, and its not just you its every gm 6 cyl made 1996 and up, the oil will not change it the fix is replacement, but let them get a little worse

jim

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+1

Wednesday, October 17th, 2007 AT 6:19 PM