setting base idle question L98 '85
Thread Starter
Racer
Joined: Jun 2005
Posts: 416
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From: Gansevoort NY
setting base idle question L98 '85
Ok so I have read the article on setting base idel but my question is On a vehicle that has had their throttleplate adjustment screw previously adjusted do I have to back that off first before setting the idle?
The reason I ask is because my 85 is suffering from a surging idle. I tried to do the adjustment as written and it didnt change anything. I havent yet checked my TPS either though. I got to thinking that maybe I have to backoff the throttleplate screw before I reset the idle.
I was planning on checking the TPS shortly so if I have to do the IAC again I will.
Thanks for the help.
The reason I ask is because my 85 is suffering from a surging idle. I tried to do the adjustment as written and it didnt change anything. I havent yet checked my TPS either though. I got to thinking that maybe I have to backoff the throttleplate screw before I reset the idle.
I was planning on checking the TPS shortly so if I have to do the IAC again I will.
Thanks for the help.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
A surging idle could be due to a vacuum leak; check the hoses and measure manifold vacuum.
I had to increase base idle with that screw and then back down to 450rpm as my L98 doesn't like to idle long at that speed.
Have you cleaned the TB and the IAC pintel & bore before setting base idle??
I had to increase base idle with that screw and then back down to 450rpm as my L98 doesn't like to idle long at that speed.
Have you cleaned the TB and the IAC pintel & bore before setting base idle??
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by 85C4fanatic
On a vehicle that has had their throttleplate adjustment screw previously adjusted do I have to back that off first before setting the idle?
I tried to do the adjustment as written and it didnt change anything. I got to thinking that maybe I have to backoff the throttleplate screw before I reset the idle.
I tried to do the adjustment as written and it didnt change anything. I got to thinking that maybe I have to backoff the throttleplate screw before I reset the idle.
RACE ON!!!
