Intermitent kocking
Thread Starter
7th Gear
Joined: Dec 2008
Posts: 7
Likes: 0
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!!
Racer
Joined: Nov 2008
Posts: 309
Likes: 0
From: Lakeland Florida
Does it change with the RPM or is it a steady knock that is just there.
My alternator went out on me and made a knock like sound, it went away with some screeching and smoke
You can use a long metal rod placed on your ear, move the other end around on the block and it will act like a stethoscope and tell you where the knock is coming from.
Or you could just get a stechoscope
My alternator went out on me and made a knock like sound, it went away with some screeching and smoke
You can use a long metal rod placed on your ear, move the other end around on the block and it will act like a stethoscope and tell you where the knock is coming from.
Or you could just get a stechoscope
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
Maybe you should get another friend to help isolate where it's coming from. How are the oil and coolant temps, and oil pressure? Kinda wondering if you're not getting some detonation from unburnt fuel in the cat, since you mentioned the cat. That might cause a popping sound.
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