1986 corvette
Drifting
Joined: Feb 2006
Posts: 1,423
Likes: 96
From: Magnolia Tx
My '86 is cold natured too. Does yours warm up and smooth out? Mine does, so I did all
the normal tune-up stuff and pretty much gave up. I warm it up a minute or so before i
drive off on the first trip of the day.
the normal tune-up stuff and pretty much gave up. I warm it up a minute or so before i
drive off on the first trip of the day.
Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
The throttleblade screw is capped at the factory for a reason. Everyone thinks they can tune efi by adjusting this screw. The correlation between the throttleblade, and the IAC is important. While adjusting this screw will make a temporary difference, idle is set in the programming, period.
See here for minimum idle air adjustment:
http://www.chevythunder.com/do_it_yo...ation_page.htm
See here for minimum idle air adjustment:
http://www.chevythunder.com/do_it_yo...ation_page.htm
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
I agree with all the MrWillys said.
Just turning the screw is not the way to tune the car, and it should be done correctly.
I found that after 26 years or so my car was dying at stops. I fixed it by doing the minimum idle adjustment. I thought I would never have to do this, but apparently the throttle body linkage bends over time or the screw wears the linkage and affects the position of the throttle blades.
Just turning the screw is not the way to tune the car, and it should be done correctly.
I found that after 26 years or so my car was dying at stops. I fixed it by doing the minimum idle adjustment. I thought I would never have to do this, but apparently the throttle body linkage bends over time or the screw wears the linkage and affects the position of the throttle blades.
Le Mans Master
Joined: May 2006
Posts: 7,708
Likes: 266
From: indy indiana
you also might try spraying carb cleaner thru the thing. Those throttle blades get really dirty and may not be closing like they should. Sprayed mine and it helped, couldn't believe all the build up.
