2012 V6, 6-spd, LS, Noise from engine between shifts - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

trossit · 12-23-2021, 08:49 PM

Hi Everyone,

I have a strange issue that just started 2 days ago with my 2012 V6 Camaro, 74,000 miles. More noticeable when cold but can also do it warm. When shifting between first and second, and also 2nd to 3rd, between 3000 and 4000RPM (or higher) as the RPMs drop slightly between gear exchanges it makes a dull metallic rattle sound from under the hood on the compression side of the exchange. It will also make this sound if I accelerate in second gear to about 4500 RPMs and then let the throttle off abruptly and as the compression is slowing the car down it makes this rattle sound. It almost sounds like a loose heat shield or maybe something in the exhaust system. Very worried taking this in to the dealership....$$$. Anyone else have this issue with their Camaro, in the V6?

Thanks

trossit · 12-24-2021, 12:37 PM

The sound is almost like what a wastegate on a turbo makes between shifts when the engine is under moderate to heavy compression. It almost makes a sound similar to when the Heater fan is, a rushing sound coming up close to the firewall. It makes me think it could be an exhaust issue, a noisy catalytic converter?

12-23-2021, 08:49 PM	#1
trossit Drives: Chevrolet Camaro LS Join Date: Jun 2020 Location: Portland, Oregon Posts: 78	2012 V6, 6-spd, LS, Noise from engine between shifts Hi Everyone, I have a strange issue that just started 2 days ago with my 2012 V6 Camaro, 74,000 miles. More noticeable when cold but can also do it warm. When shifting between first and second, and also 2nd to 3rd, between 3000 and 4000RPM (or higher) as the RPMs drop slightly between gear exchanges it makes a dull metallic rattle sound from under the hood on the compression side of the exchange. It will also make this sound if I accelerate in second gear to about 4500 RPMs and then let the throttle off abruptly and as the compression is slowing the car down it makes this rattle sound. It almost sounds like a loose heat shield or maybe something in the exhaust system. Very worried taking this in to the dealership....$$$. Anyone else have this issue with their Camaro, in the V6? Thanks

12-24-2021, 12:37 PM	#2
trossit Drives: Chevrolet Camaro LS Join Date: Jun 2020 Location: Portland, Oregon Posts: 78	Update! The sound is almost like what a wastegate on a turbo makes between shifts when the engine is under moderate to heavy compression. It almost makes a sound similar to when the Heater fan is, a rushing sound coming up close to the firewall. It makes me think it could be an exhaust issue, a noisy catalytic converter?