One second grind on cold start.
 

Hello everyone. I'm looking for some help in this. When I start my HHR, after two seconds of running it makes a one second "flutter/grind" sound. This only happens when it's been sitting for at least a couple hours. It sounds worse when sitting over night. I'm going to try and pin point the area. My car isn't hesitating, idling rough or bogging at stop lights. I just have this weird one second sound that I don't like! Any help would be greatly appreciated.

Thanks

:cussing:

I'm noticing the same thing in the morning...

Starter solonoid not disengaging?

Tyler Harvey,

I'm sorry you are having this issue. Have you considered having this issue addressed at the dealer?

Evan, Chevrolet Customer Service

Have you started using a different oil and filter? Sounds like it could be your throw out bearing.

He has an auto so no throw out bearing.

I do notice something that might be what the OP described when I start the car... I think it is the auxiliary brake vacuum pump cycling on so it has proper vacuum for the brakes. I wouldn't call it a grind, but I do notice a noise and a short-duration drop in the idle right after starting the car. It's done it for a long time.

Didn't know the SS came with auto as an option.

Did you think, only edges have auto ??

Could be your ABS module doing it's self check at start-up.

That was very productive...