HELP!!! Idle problem
Thread Starter
Team Owner
Joined: Oct 2004
Posts: 35,065
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From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
HELP!!! Idle problem
I am having a problem with Idle.
If I gently race the engine with my foot when it settles back down and races up then drops, up then drops , up then drops. The idle fluctuates by a few 100 RPMs.
1990 Coupe L-98 Unmolested.
Any advice would be appreciated.
Thanks
If I gently race the engine with my foot when it settles back down and races up then drops, up then drops , up then drops. The idle fluctuates by a few 100 RPMs.
1990 Coupe L-98 Unmolested.
Any advice would be appreciated.
Thanks
Team Owner
Joined: Oct 2000
Posts: 96,443
Likes: 9
From: Fort Knox, KY
Cruise-In IV Veteran
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Have you removed and cleaned your throttle body (TB) and idle air control (IAC) motor pintle? If that doesn't fix it, check for vacuum leaks.
Read the C4 Tech Tips Section on this forum for the TB article. It'll walk you right through it. Really mellows your base idle and improves throttle response, too.
Read the C4 Tech Tips Section on this forum for the TB article. It'll walk you right through it. Really mellows your base idle and improves throttle response, too.
Thread Starter
Team Owner
Joined: Oct 2004
Posts: 35,065
Likes: 0
From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
Have you removed and cleaned your throttle body (TB) and idle air control (IAC) motor pintle? If that doesn't fix it, check for vacuum leaks.
Read the C4 Tech Tips Section on this forum for the TB article. It'll walk you right through it. Really mellows your base idle and improves throttle response, too.
Read the C4 Tech Tips Section on this forum for the TB article. It'll walk you right through it. Really mellows your base idle and improves throttle response, too.
Race Director
Joined: Jun 2005
Posts: 17,640
Likes: 1
From: Lenoir City TN
St. Jude Donor '08-'09-'10-'11
Have you removed and cleaned your throttle body (TB) and idle air control (IAC) motor pintle? If that doesn't fix it, check for vacuum leaks.
Read the C4 Tech Tips Section on this forum for the TB article. It'll walk you right through it. Really mellows your base idle and improves throttle response, too.
Read the C4 Tech Tips Section on this forum for the TB article. It'll walk you right through it. Really mellows your base idle and improves throttle response, too.
Most times it is the IAC that gets dirty over time.
