Colleptic Corvette

EDIT - Think I have the answers, but I will leave it up just in case others have this same question, so they can search it.


Hello everyone,


I just purchased a used higher mileage 2006. It runs and shifts great, quite amazed actually, but when it is sitting at idle (either in park or drive) is has a rough idle to it, sort of a shimmy, it is very subtle, but it is there.


Do you guys think it simply needs a tune up?


Thanks for any info in advance!

martysauto

Fresh plugs, professional fuel injector cleaning, clean throttle body.

Redvette2

My 2007 with 53K miles does the same thing....kind of occasional shake every second or so. May be normal as at 600 RPM idle each individual piston is firing off pretty slowly.

HBsurfer

My 2007 with 30,000 miles does the same thing.

Colleptic Corvette

Thanks, maybe it is just something I am not used to.

Colleptic Corvette

Good points, I will have to check the last time the plugs were done.

SpeedUp

I have a 2012 with 11k miles and this LS3 has a very rough idle.

torquetube

What's high mileage?

My 2006 has 125K miles and it does the same thing, just like it did when it was brand new. SBCs have a little rock to them at idle.

From your description I doubt there's anything wrong with your car, though it's tough to describe which vibrations are normal and which aren't.

Big ol 68

My 105xxx mile 2006 does the same. Gotta think the motor mounts might be starting to go. Plus they are made of softer rubber.

Colleptic Corvette

OK thanks, seems like something I am just not used too. Since it is very consistent, and ordered, I will go with the fact it is the SBC/firing order.


Seems like most people have posted this is a normal thing.

cclive

I think it's normal also...but remember that these engines now idle at a very low speed...just over 600 rpm. In the old days, an engine wouldn't even be capable of running at that low a speed.