CAMARO6 - View Single Post - Slight chirp/squeak after cold start (sounds like belt/pulley) lasts only 30 sec?

hawk02 · 03-07-2017, 05:01 PM

Well if it's any consolation, the LT4 in my ZL1 makes the same noise on cold startup. Just like everyone else, it only happens when the engine hasn't been started for 24 hours or longer.

I thought it might be the supercharger pulley squealing but since none of you have superchargers, that obviously can't be it.

I first noticed it around Christmas (cold temps) after my car had sat for more than a week without starting. Definitely something to do with cold startup.

I found a similar post to this one over in the C7 Z06 section of the Corvette Forums. I contacted the OP to see if he found a fix. He replied back that he never found a fix and has just learned to ignore the noise. Says his Z06 runs great, so whatever it is, it doesn't seem to affect performance.

I've been meaning to make a recording of the noise to post over in the ZL1 section to see if other ZL1s are making the same noise. If I get around to recording the noise, I'll post it here as well.

03-07-2017, 05:01 PM	#47
hawk02 Coupe Newbie Drives: '23 CT5-V BW, '21 Corvette HTC Join Date: Jul 2011 Location: Columbus, Ohio Posts: 3,465 View My Garage	Well if it's any consolation, the LT4 in my ZL1 makes the same noise on cold startup. Just like everyone else, it only happens when the engine hasn't been started for 24 hours or longer. I thought it might be the supercharger pulley squealing but since none of you have superchargers, that obviously can't be it. I first noticed it around Christmas (cold temps) after my car had sat for more than a week without starting. Definitely something to do with cold startup. I found a similar post to this one over in the C7 Z06 section of the Corvette Forums. I contacted the OP to see if he found a fix. He replied back that he never found a fix and has just learned to ignore the noise. Says his Z06 runs great, so whatever it is, it doesn't seem to affect performance. I've been meaning to make a recording of the noise to post over in the ZL1 section to see if other ZL1s are making the same noise. If I get around to recording the noise, I'll post it here as well. __________________