Tap Tap Tap...Calling all Mechanics - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

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post #1 of 5 (permalink) Old Apr 25th, 01, 05:09 AM Thread Starter
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Join Date: Aug 2000
Location: Batavia OH. USA
Posts: 41

I have a tapping noise that seems to be coming from the pass. side valve cover area. It doesn't make this sound when the engine is cold. Only when it's at operating temp. It's Does NOT do it at idle or past 1800rpm's. It only makes this tapping sound at about 1200-1500 rpms. It has been making this sound since I got the car a year ago and its no worse or better. Any ideas? I just put a new set of headers, so I know it's not that. I have heard lifters tap before and I think they keep on tapping at higher rpms. Could it be a bent push rod or a rocker arm out of adjustment? Has anyone ever had this sound only at a 200 rpm range?
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post #2 of 5 (permalink) Old Apr 25th, 01, 06:01 AM
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Join Date: Feb 2000
Location: McKinney, Tx
Posts: 3,557

Since you just put a new set of headers on, you sure it couldn't be an exhaust leak? I would use a piece of garden hose, put it against your ear, and move it around the suspected area, to see if you can pinpoint exactly where the noise is coming from......Just a thought.....KZ

John D. Smith
69' SS/396 CLONE!
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post #3 of 5 (permalink) Old Apr 25th, 01, 06:37 AM
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Join Date: Sep 2000
Location: Dixon, IL, USA
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It is most likely lifter noise. First would be to look at some of the threads of the past on this site to get instructions on adjusting your rocker arms. While doing this it would be a good time to remove and inspect all the rockers and push rods for wear or damage. As stated above use a piece of hose to determine where the noise is coming from. If it is a lifter it should be no problem pinning it down. Look extra hard at this one for rocker, push rod or valve stem wear.
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post #4 of 5 (permalink) Old Apr 27th, 01, 03:13 PM
Join Date: Apr 2001
Posts: 26

I have seen and heard the fuel pump cause this type of noise, driving all involved crazy. Try using a screw driver on the pump to see if it is noisy. Ray
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post #5 of 5 (permalink) Old Apr 28th, 01, 11:21 AM
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Join Date: Jan 2001
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Or get one of those doctor looking stethoscopes for cars, any good auto parts store should have em. It's real easy to pin point a knock with em.
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