Idle Problem
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Junior Member
Joined: Aug 2004
Posts: 1
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From: Matthews, NC
Car: 1992 Firebird
Engine: 305 TBI
Transmission: Automatic
Idle Problem
I have a 92 Firebird with a 305 TBI, automatic
I have a problem with the idle speed. It refuses to idle below
1800 rpm. I have rebuilt the throttle body and installed a new
idle motor. I can adjust the idle pintle out and get it to idle at
700 rpm, but as soon as I drive a short distance the CPU kicks the idle back up to 1800. Any suggestions would be greatly appreciated.
I have a problem with the idle speed. It refuses to idle below
1800 rpm. I have rebuilt the throttle body and installed a new
idle motor. I can adjust the idle pintle out and get it to idle at
700 rpm, but as soon as I drive a short distance the CPU kicks the idle back up to 1800. Any suggestions would be greatly appreciated.
Joined: Feb 2001
Posts: 13,753
Likes: 560
From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
What is the length of the IAC pintle when you played with it? Did you put a clean drop of oil on the spring and pintle before you reinstalled it? It should not exceed 1.125". I would check for vacuum leaks around the base of the TBI as well as all of your vaccum hoses. Make sure they are all connected and not split in any way.
Member
Joined: May 2004
Posts: 289
Likes: 0
From: SE Michigan
Car: 81 Turbo Trans Am
Engine: 301 T
Transmission: 200-4R
I'm not entirely clear on whether the problem was there *before* the rebuild or *after*. Either way, after checking for the vacuum leaks, make sure you go through the minimum airflow procedure located here :
https://www.thirdgen.org/newdesign/tech/tpimod2.shtml
It may be that an IAC reset is all that's needed if you're able to get the car to idle with it fully extended....?
https://www.thirdgen.org/newdesign/tech/tpimod2.shtml
It may be that an IAC reset is all that's needed if you're able to get the car to idle with it fully extended....?
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