Rough Idle
Thread Starter
Intermediate
Joined: Mar 2019
Posts: 26
Likes: 2
From: Monterey, TN
Rough Idle
Also posted in Genery Discussion:
I recently purchased a new to me 2008 Coupe LS3 w/ Auto. I attended the Corvette Expo in Pigeon Forge yesterday. I’ve noticed a very minor rough idle. So I put my scanner on it and the rom fluctuates between 585-627. No codes present.
Does anyone have any idea where to start? Maybe a coil pack? Are is it something as as big as the ECM?
I recently purchased a new to me 2008 Coupe LS3 w/ Auto. I attended the Corvette Expo in Pigeon Forge yesterday. I’ve noticed a very minor rough idle. So I put my scanner on it and the rom fluctuates between 585-627. No codes present.
Does anyone have any idea where to start? Maybe a coil pack? Are is it something as as big as the ECM?
Burning Brakes
Joined: Apr 2008
Posts: 1,030
Likes: 55
From: Brentwood(Contra Costa County) CA
The 08 manual I had, had a little roughness. General consensus is it’s a cam thing. Can you visually see the tach needle movement? I can’t say that I saw a fluctuating tach needle.
Thread Starter
Intermediate
Joined: Mar 2019
Posts: 26
Likes: 2
From: Monterey, TN
Rough idle
So when you say cam issue, what is it? Worn out, bad timing chain?
Mare these cars known for that? And it’s only got 19,000 miles.
What about the harmonic balancer?
Drifting
Joined: Jul 2011
Posts: 1,821
Likes: 442
From: Boca Raton Florida
Normal. All vettes idle little chopy. If yours is a minor, that is even better. RPMS are all good too, i would not waste any money on it or loose sleep over. It sounds like with those low miles it needs some high rpm runs to clean up those plugs 
Thread Starter
Intermediate
Joined: Mar 2019
Posts: 26
Likes: 2
From: Monterey, TN
Rough idle
Yeah this is my first. So little idiosyncrasies are not known to to me.
