L98 High Idle
Thread Starter
Team Owner
Joined: Mar 2001
Posts: 66,704
Likes: 86
From: Santa Cruz CA
St. Jude Donor '15
L98 High Idle
Just this past week, I've had trouble bringing my '89 Coupe (L98/Auto) to a stop. At first I thought the brakes were fading. Then it dawned on me that the engine idle is not coming down as I start to slow. So as I'm applying the brakes, the higher RPM's are trying to keep it rolling. It's got a Hypertech chip in it (was there when I bought the car).
Even at a complete stop the idle varies between 800 and 1200 RPMs. Is there something common that's causing this? :confused:
Thanks
[Modified by ZR-71, 11:53 AM 11/13/2003]
Even at a complete stop the idle varies between 800 and 1200 RPMs. Is there something common that's causing this? :confused:
Thanks
[Modified by ZR-71, 11:53 AM 11/13/2003]
Thread Starter
Team Owner
Joined: Mar 2001
Posts: 66,704
Likes: 86
From: Santa Cruz CA
St. Jude Donor '15
Re: L98 High Idle (johnnyevans)
Quote
________________________________________ ________________________
I'm sure that you mean .8k and 1.2k.
Sorry, I just couldn't resist that one.
________________________________________ ________________________
Yep, thanks I corrected it.
:seeya
________________________________________ ________________________
I'm sure that you mean .8k and 1.2k.
Sorry, I just couldn't resist that one.
________________________________________ ________________________
Yep, thanks I corrected it.
:seeya
Pro
Joined: May 2003
Posts: 671
Likes: 1
From: WATERFORD CT
Re: L98 High Idle (ZR-71)
Check you TPS sensor. Mine went bad and the car idled way high. Also this could be a Throttle Body problem .Have you touched the owl screw?There is a very good TECH TIP on how to set and ajust your TPS and Owl screw for a base idle.
Le Mans Master
Joined: Jul 2002
Posts: 5,818
Likes: 2
From: Alive and well in Burlington NC
Re: L98 High Idle (montie98)
Make sure that the throttle body blades are closing all the way. The IAC should handle the air flow at idle. Your TB and IAC make need a little cleaning.
Le Mans Master
Joined: Jan 2003
Posts: 5,858
Likes: 7
From: Santa Maria CA
Re: L98 High Idle (Steel Blue 91)
I HAD THE SAME PROBLEM WITH MY 86. IT IDLED WAY HIGH. I CLEANED OUT THE CONNECTION TO THE TPS AND IDLE DROPPED BACK DOWN. HERES HOW TO ADJUST IT. https://www.corvetteforum.com/techti...D=55&TopicID=2
