82 rough idle
Thread Starter
7th Gear
Joined: Dec 2003
Posts: 7
Likes: 0
From: Barron WI
82 rough idle
First time purchaser of an 82. Owner says he will correct the rough, low idle. Any suggestions? I provided him service bulletin info on rough idle, but thought this forum may give me faster results. Any help out there?
Race Director
Joined: Dec 1999
Posts: 16,945
Likes: 9
Re: 82 rough idle (skapvette)
All CFI cars have somewhat of a rough idle when cold but it should be smooth when warm. If the idle speed is below 600rpm it is low, although 750-800 rpm is a nice idle speed. To raise the idle RPM you need to set minimum air since the ECM actually controls the idle. If you can, hook up a scanner and read the IAc positions. It should be around 10-40 (these are pos. numbers, they range fom 0-255). If it is higher the ECM is trying to raise the idle rpm but it will try to return to a normal IAC position giving the erratic idle.
The proper way to set minimum is in gear with the IAC'splugged. Set the idle around 400rpm.
Setting minimum air is a bit tricky and you need a water manometer.
The proper way to set minimum is in gear with the IAC'splugged. Set the idle around 400rpm.
Setting minimum air is a bit tricky and you need a water manometer.
Race Director
Joined: Jun 2001
Posts: 16,483
Likes: 1
From: The Only Corvette in Gila Bend, Az.
St. Jude Donor '09
Re: 82 rough idle (Corvette ED)
And since you are gonna need further info on your 82, And Twin Turbo forgot to mention it :banghead: go to the Crossfire forum. :seeya
http://www.crossfire.homeip.net:81/
And welcome to the Corvette Forum.
http://www.crossfire.homeip.net:81/
And welcome to the Corvette Forum.
