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

BOSE ZO · 05-07-2019, 08:55 PM

I think its happening on more than just the V8 cars, my 2018 LS V6 M6 (not equipped with active exhaust or the adaptive exhaust valve) as an odd sound on immediate cold idle, I feel its an emissions tuning protocol. From under the car forward, it sounds like a bunch of light popping and squeaking, almost like an exhaust leak. Out the back it sounds like it has chambered muffler. And then 15 or so seconds later the the whole thing quiets up, quite amazing. Someone on here posted about a double injector pulse on the intake stroke, I don't know how true that all is but I'm not worried about it...In fact I think a lot of DI cars do this, although I don't think they are as flamboyant about it as GM is with these cars. See linked video.

https://youtu.be/RHRSkF776-A

05-07-2019, 08:55 PM	#68
BOSE ZO Drives: 2018 CHEVROLET Camaro LS LGX/TR3160 Join Date: Apr 2019 Location: Capital Region, NY Posts: 51	I think its happening on more than just the V8 cars, my 2018 LS V6 M6 (not equipped with active exhaust or the adaptive exhaust valve) as an odd sound on immediate cold idle, I feel its an emissions tuning protocol. From under the car forward, it sounds like a bunch of light popping and squeaking, almost like an exhaust leak. Out the back it sounds like it has chambered muffler. And then 15 or so seconds later the the whole thing quiets up, quite amazing. Someone on here posted about a double injector pulse on the intake stroke, I don't know how true that all is but I'm not worried about it...In fact I think a lot of DI cars do this, although I don't think they are as flamboyant about it as GM is with these cars. See linked video. https://youtu.be/RHRSkF776-A __________________ LorenZo 2018 CHEVROLET Camaro LS -The Giant Black SEALION- LGX/TR3160 w/BOZE!!!!! ig: rapidtransit Last edited by BOSE ZO; 05-07-2019 at 09:13 PM.