Intermitent kocking
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7th Gear
Joined: Dec 2008
Posts: 7
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Intermitent kocking
I have a 1996 Silver Edition Corvette, LT4 automatic with 90,000 miles. I have the car regularly serviced and is in excellent condition. Yesterday, when I started the car I heard an intermittent clicking/low knocking sound. There is no grinding when I start the car and all fluid levels are where they should be. It is more persistent on lower RPMs and when the car idles and gets muffled on higher RPS. There is no spark misfire. It sounds like perhaps a bearing problem??? I initially thought it may be the catalytic converter. The rocker arms/pistons look fine when I removed the head covers. The computer module in the car shows no malfunctions. Without tearing down the engine I am looking for any suggestions. It has been difficult trouble shooting this problem and any suggestions would be appreciated!! Thank you!!
Safety Car
Joined: Sep 2001
Posts: 4,155
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From: Glenbeulah Wi
I have a 1996 Silver Edition Corvette, LT4 automatic with 90,000 miles. I have the car regularly serviced and is in excellent condition. Yesterday, when I started the car I heard an intermittent clicking/low knocking sound. There is no grinding when I start the car and all fluid levels are where they should be. It is more persistent on lower RPMs and when the car idles and gets muffled on higher RPS. There is no spark misfire. It sounds like perhaps a bearing problem??? I initially thought it may be the catalytic converter. The rocker arms/pistons look fine when I removed the head covers. The computer module in the car shows no malfunctions. Without tearing down the engine I am looking for any suggestions. It has been difficult trouble shooting this problem and any suggestions would be appreciated!! Thank you!!-a few seconds = rod bearing knock until oil pressure builds up
-10 minutes = piston slap that goes away once the pistons warm up
-Never goes away = ? Could be a few items
