IAC motor testing - Muscular Mustangs
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post #1 of 6 Old 10-26-2008, 04:13 PM Thread Starter
 
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IAC motor testing

Does anyone know how to test the IAC motor? My 5.0 surges at idle. I have looked at the motor and it is clean with no obvious problems.
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post #2 of 6 Old 10-26-2008, 05:03 PM
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I've never heard of a way of testing them and a local dealer once told me that they don't test them they just replace them...LOL



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post #3 of 6 Old 10-26-2008, 07:54 PM
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The only "test" is to unplug it. If there's no change in the idle performance, then change it. They can be cleaned once or twice, but this is a temporary fix. I would try the battery disconnect/idle re-learn trick first.
https://www.muscularmustangs.com/idlereset.php

'87 GT with a battery
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post #4 of 6 Old 01-11-2009, 03:40 PM
 
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My idle is fine most of the time, but sometimes will act up. I have also noticed that when running my A/C it has a consistent 100 rpm surge. What would cause this?
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post #5 of 6 Old 01-11-2009, 07:23 PM
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Do you mean that the idle jumps when you turn the AC on? That is normal.



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post #6 of 6 Old 01-11-2009, 09:20 PM
 
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No. the idle will have a constant 100rpm up and down surge with the a/c on. If I turn it off it will sit there and idle steady. At times my rpm's will go crazy jumping up to 2000 or so and hunting. I can usually turn the car off and restart it and it will level back out.
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