idle problems
Thread Starter
Registered User
Joined: Jan 2003
Posts: 891
From: Central Iowa
idle problems
idk what the deal is it just started happening to me today...
on my way home from a nice sunday morning cruise, my car was being kinda hesitant adn when i came to a stop sign it died on me it ussually idles at 1000-1100 rpms then it went to 500 then it died... idk what the deal is, i fired it up later this afternoon and it did the same thing. any info would be greatly appreciated.
on my way home from a nice sunday morning cruise, my car was being kinda hesitant adn when i came to a stop sign it died on me it ussually idles at 1000-1100 rpms then it went to 500 then it died... idk what the deal is, i fired it up later this afternoon and it did the same thing. any info would be greatly appreciated.
Administrator
Joined: Nov 1998
Posts: 71,094
From: Hell was full so they sent me to NJ
Idle speed is controlled by the PCM, using the idle air control (IAC) motor in the base of the throttle body. Possibly the IAC motor is faulty, the wiring is faulty, or the IAC passages in the TB housing are plugged up. Could also be a sign that the TB was not set up properly when it was installed, checking to insure the IAC counts in the PCM are in the range of 20-40 when the engine is idling at the RPM programmed into the PCM.
Thread Starter
Registered User
Joined: Jan 2003
Posts: 891
From: Central Iowa
how do i check to make sure that is the problem? do i take it to a shop and have em hook the beast up to see whats wrong with it or won't that help....
the CPU was programmed by ed wright with a list of all the engine info, when the engine was installed.
the CPU was programmed by ed wright with a list of all the engine info, when the engine was installed.
Administrator
Joined: Nov 1998
Posts: 71,094
From: Hell was full so they sent me to NJ
You need to put a scanner on it and look at how the IAC counts are reacting to the incorrect idle speed. IF the PCM is increasing the counts, but the idle speed isn't coming up, you know that you have one of the above problems.
Administrator
Joined: Nov 1998
Posts: 71,094
From: Hell was full so they sent me to NJ
When in doubt, go to Shoebox's tech pages, and pull up a picture.....
IAC motor
The idle air enters through a hole in the bottom triangle between the throttle bores in the throttle body, and goes into a removable cover plate on the bottom of the throttle body, where the IAC motor is located.
IAC motor
The idle air enters through a hole in the bottom triangle between the throttle bores in the throttle body, and goes into a removable cover plate on the bottom of the throttle body, where the IAC motor is located.
Thread Starter
Registered User
Joined: Jan 2003
Posts: 891
From: Central Iowa
how hard is this to fix? i'd like to try to attempt to clean it myself. can you buy the IAC unit by itself or do i just clean it really well and put it back together? any info on doin this project would be great. thanks
Registered User
Joined: Nov 2003
Posts: 644
From: Mustang OK
Originally posted by fstenuf
how hard is this to fix? i'd like to try to attempt to clean it myself. can you buy the IAC unit by itself or do i just clean it really well and put it back together? any info on doin this project would be great. thanks
how hard is this to fix? i'd like to try to attempt to clean it myself. can you buy the IAC unit by itself or do i just clean it really well and put it back together? any info on doin this project would be great. thanks
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