LS3 Idle
Burning Brakes
Joined: Nov 2002
Posts: 1,018
Likes: 52
From: Deltona Fl.
cams.
Team Owner
Joined: Oct 2007
Posts: 26,745
Likes: 694
From: PA
The largest LS1 lift was what, the 99/2000 year with something like .497? Even then though the .52X is pretty tame.
The LS3 idles funny because the idle speed is lower.
You will get a kick out of this. My dad and his friends looked at my 2012 when I first got it and said "Not much of a cam huh?" so I showed them the specs. The stock cam is a big cam compared to years prior and they didnt believe me that it was that large of a cam. By todays standards its pretty tame.
Thread Starter
Le Mans Master
Joined: Oct 2005
Posts: 6,652
Likes: 2,106
From: Left Coast, San Diego
Took car to the dealer..under warranty. They scoped it, checked for misfires(none). Said everything is good. Between the cam and the computer, engine idle is good.
At least now I know for sure.
At least now I know for sure.
Le Mans Master
Joined: Jan 2008
Posts: 6,457
Likes: 297
From: corpus christi Texas
Safety Car
Joined: Nov 2007
Posts: 4,436
Likes: 875
From: Bay Area CA
My 2008 manual idles at 650 rpm when warm. The idle will vary slightly + or - 25 rpm, but mostly at 650. I would data log the fuel trims to see if they are adjusting erratically. If erratic + fuel trims are present, they could be adjusting for a vacuum leak. The ECM will also adjust the timing to maintain idle, check for timing variance.
Incorrect spark plug gap or a bad wire can cause rough idle.
Incorrect spark plug gap or a bad wire can cause rough idle.
Last edited by Mike's LS3; Nov 27, 2013 at 12:49 AM.
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Team Owner
Joined: Oct 2007
Posts: 26,745
Likes: 694
From: PA
Prior use. The only thing I have had any sort of luck with is to use (and have to use it multiple times in a row) is something like the Lucas Fuel System Treatment but that was because the car sat with the same gas in it for almost a year and it was worth a shot vs. dropping the tank. lol I saw MPG's raise up and the car run smoother but I used to for 4 fill ups in a row.
Most of the stuff is repackaged gas with "additives". If its that bad I would opt just to change the filter and clean the injectors.
Most of the stuff is repackaged gas with "additives". If its that bad I would opt just to change the filter and clean the injectors.
