1989 D100 intermittently stalls and idles poorly..
Administrator
Joined: Apr 2010
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From: Clayton MI
Disconnect the battery for 30 minutes. 
When you have it all put back together, turn the key to on, not start, count to ten, then start the truck. Let the computer re-learn how to idle the truck.
When you have it all put back together, turn the key to on, not start, count to ten, then start the truck. Let the computer re-learn how to idle the truck.
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Rookie
Joined: Aug 2018
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Yeah seems way to high but idk why it would be doing that and what you mean close all the way I have the adjusting screw as far in as possible and it moves good I mean it’s a brand new one so I’m not sure why it’s like that
Administrator
Joined: Apr 2010
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From: Clayton MI
The pintle on the IAC moves in and out to regulate airflow that bypasses the throttle plates. It should extend OUT far enough to completely close off the hole in the throttle body. You should be able to look down the iac well, and see it. If you have been moving the pintle around, and NOT resetting the PCM, that may be the reason for the high idle. So, reset the PCM, (just disconnect the battery for 30 minutes or so.) Then, turn the ignition on, (not start, yet) count to ten, THEN start the motor. That *should* let the pcm relearn the IAC. If you still have a high idle, then, you have a pretty massive vacuum leak somewhere......... Gonna have to figure out where.
Legend
Joined: Jun 2009
Posts: 8,025
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From: orangeville ontario
there is no IAC on a TBI setup. there is a idle speed controller that pushes the throttle open.
have you adjusted it using the procedure described in one of the posts i posted earlier? i am guessing this may be why you are suppose to disconnect the idle speed motor while adjusting it.
have you adjusted it using the procedure described in one of the posts i posted earlier? i am guessing this may be why you are suppose to disconnect the idle speed motor while adjusting it.
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Rookie
Joined: Aug 2018
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Well when get to the part where you disconnect the idle control and the coolant sensor and go start back up let warm until normal operating temp it goes to like 8-9000 rpm for some reason idk why but it does