Rough Idle
Thread Starter
Instructor
Joined: Apr 2002
Posts: 159
Likes: 0
From: Delanson NY
Rough Idle
Have a 89 L98 which starts and runs great when cold, but after she warms up she tends to idle rough when coming to a stop and also when you start after warm if you don't touch the gas a bit she'll stall. any ideas as to how to fix or adjust??? Thanks!
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
If you had hard starting when warm I might suspect a leaking injector, but in your case I think the rough warm idle is due to a problem with a dirty IAC and/or TB.
Get some TB cleaner and clean out the TB & throttle plates. If that doesn't do the job, pull the IAC motor and clean it's pintel and the bore under the TB. Then set base idle to 450RPM, method on my site.
Get some TB cleaner and clean out the TB & throttle plates. If that doesn't do the job, pull the IAC motor and clean it's pintel and the bore under the TB. Then set base idle to 450RPM, method on my site.
