random high idle
Thread Starter
Drifting
Joined: Apr 2003
Posts: 1,379
Likes: 4
From: rome ny
random high idle
just yesterday i was getting a random high idle.it would stick at about 1200 rmps then i would hit the gas and it would settle down. i first thought throttle cable but it isnt. im not getting any code on the scanner. what could possibly cause this??
Drifting
Joined: Nov 2002
Posts: 1,593
Likes: 0
From: Mobile AL
St. Jude Donor '05
Could be IAC (Idle Air Control) valve. They get carboned up. Remove & clean and replace, or just buy a new one. They are about $40. (there's threads here on proper setup procedure).
the butterflies in the tb were getting hung up.
Burning Brakes
Joined: Jun 2003
Posts: 1,229
Likes: 1
Hey! I have the same problem, it will sometimes keep reaving to 1200 at a stop or red light and if I just touch the gas pedal like you it will go back to normal. I first through it was also the IAC.
What do you mean the butterfly in the TB was getting hung up? was it really dirty? what did you do to fix it.
What do you mean the butterfly in the TB was getting hung up? was it really dirty? what did you do to fix it.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Take some TB Cleaner to the TB plates & bore; if that doesn't fix the idle issue, pull the IAC and clean it's pintel and bore under the TB. Then reset base idle, per directions on my site but ignore the TPS adjustment on a '90 or '91 L98 as the TPS is not adjustable in those years.
Thread Starter
Drifting
Joined: Apr 2003
Posts: 1,379
Likes: 4
From: rome ny
Originally Posted by 65Z01
Take some TB Cleaner to the TB plates & bore; if that doesn't fix the idle issue, pull the IAC and clean it's pintel and bore under the TB. Then reset base idle, per directions on my site but ignore the TPS adjustment on a '90 or '91 L98 as the TPS is not adjustable in those years.
if yours is dirty then i would take it off and clean and lube it up..
Burning Brakes
Joined: Jun 2003
Posts: 1,229
Likes: 1
I put about 15 000 maybe 20 000 km in 3 years since the last time it was cleaned, but I don't know how clean it was after they cleaned it, maybe they just clean it with a rag or something (engine was rebuilt 3 years ago)
I'll look at it this weekend, but if it is in fact dirty and needs to cleaned out, can I just leave the TB on the car and just clean it out with some brake cleaner and a tooth brush?
If its not dirty, I'll just put some WD40 on the butterfly
If I have to clean it should I really consider taking it out and cleaning the IAC pindles? (keep in mind I don't even know what the pindles are and have never cleaned the TB before on my own)
I know there is a procedure on the tech Tip section, but if you take it all apart to clean, do you have to unscrew the two screws that holds the TPS? and then readjust it once re-installed or do you just need to re-adjust the IAC screw?
Thanks
I'll look at it this weekend, but if it is in fact dirty and needs to cleaned out, can I just leave the TB on the car and just clean it out with some brake cleaner and a tooth brush?
If its not dirty, I'll just put some WD40 on the butterfly
If I have to clean it should I really consider taking it out and cleaning the IAC pindles? (keep in mind I don't even know what the pindles are and have never cleaned the TB before on my own)
I know there is a procedure on the tech Tip section, but if you take it all apart to clean, do you have to unscrew the two screws that holds the TPS? and then readjust it once re-installed or do you just need to re-adjust the IAC screw?
Thanks
