ENGINE

[Peaven]

Originally Posted by A26B

Loose heat shields, as stated above, have ocurred several times, driving the owners nuts to find the source.

I've been trying to locate mine for the last month that happens right at 1500rpm after the car has warmed up....I'm going to give it one more shot this weekend in an effort to finally kill this snake.

[cuisinartvette]

Id second the motion on checking your cats and using a makeshift stethescope to piinpoint the noise. I had a 5.0 with cats that just "went bad" and could swear up and down I had a rod knock.

[jonszr1]

ronnie .< are you shure that wasn't brain knock from owning a FORD

[RedSled]

My weird engine noise that fooled a few people turned out to be a water pump failing.

- Keith
'90 Red/Red #1383

[cuisinartvette]

Originally Posted by jonszr1

ronnie .< are you shure that wasn't brain knock from owning a FORD

Only Ford I had that gave me brain knock was the '85 that had a 460 on squeeze stuffed in it.

[jonszr1]

ok you got me oh great white ford knocker and your cup size is

[tenedios]

THIS MAY HELP? I TAKE MY 1991 ZR1 TO STOCKER CHEVROLET IN STATE COLLEGE PA. THEY ARE THE SPONSORS OF USA-1 CORVETTE CLUB IN THE AREA WITH 90+ MEMBERS. THE MECHANIC THERE THAT SERVICES ALL OF THE CORVETTES IS MARTY SPECHT. HE IS ALSO A MEMBERSHIP OFFICER FOR THE CORVETTE CLUB. I HAVE FOUND HIM TO BE VERY KNOWLEDGEABLE AND AN EXCELLENT MECHANIC. THE PHONE NUMBER IS 814-238-4905 . I HOPE THIS HELPS.

[Kevin]

If you go to the dealer in state college let me know, I'll swing by and say hi and see if I can help

[Ccmano]

Some good ideas here... How bad is it immediately when you start the engine cold? There have been issues with timing chain tensioners on these engines. If one has failed completely you would get the noise you describe. Do the stethiscope test in the timing chain area on the valve covers, compare one side to the other.

Good luck,
Hans