flow chart for 87 ecm checking idle speed
Thread Starter
Instructor
Joined: Feb 2001
Posts: 132
Likes: 0
From: cameron mo
flow chart for 87 ecm checking idle speed
i just replaced a jammed idle air controller. the idle speed would go slower
and slower every time i turned the car on. when it got to 500 i decided to
take out iac and look at it. my question is why was there never a trouble
code? doesn't the ecm monitor the idle speed?
stark@cameron.net
and slower every time i turned the car on. when it got to 500 i decided to
take out iac and look at it. my question is why was there never a trouble
code? doesn't the ecm monitor the idle speed?
stark@cameron.net
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
Re: flow chart for 87 ecm checking idle speed (chas stark)
Hmm.... I know that the ECM can store certain codes yet not display the check engine light. Did you jump it to see if any were stored?
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Re: flow chart for 87 ecm checking idle speed (chas stark)
There are no trouble codes for the IAC. The ECM commands the position of the IAC (number of counts) based on the desired idle speed programmed into the ECM and the actual idle speed of the engine.
