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Old 02-22-2003, 10:05   #1 (permalink)
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confused stalling when aircon is on

Hi everyone,

My friend's EF fairmont's idle does not go up when the aircon is turned on. As a result, when cold starting with aircon on the car will stall. The idling when aircon off is perfect and no problem.

whenever the aircon is on and gear to drive or reverse then idle speed drop under 500, sometime stall.

I want to ask is the idle up controled by EEC? Or is there any other sensor telling ISC motor to go up when aircon is on?


Any input is appreciated , thankyou.
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Old 02-22-2003, 12:41   #2 (permalink)
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This exact same thing happened on my ED, tho ford told me it was only ED's that suffered it obviously they were wrong. The idle up is controlled by the EEC. I took mine into ford and they hooked it up to a computer, adjusted the idle speed, and i haven't had a worry since. That was over 2 years ago.
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Old 02-23-2003, 01:46   #3 (permalink)
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i would try to clean the idle speed motor first. this controls idle speed and when it clags up the idle speed can sometimes be intermittent or not even change. try this forst then take it to a garage if all else fails. if you know how to retrieve fault codes out of the computer with a multimetre try that.
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Old 02-23-2003, 20:04   #4 (permalink)
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thankyou crodarian and tickfordboy,

I have clean up the idle speed motora and reset the computer, but it still idle badly under aircon.

I guess Have to follow crodarian suggestion and back to the $dealer$.
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Old 02-24-2003, 01:16   #5 (permalink)
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lol its not that expensive, i think it only cost just over $100 and they cleaned the throttle body too they said.
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Old 02-24-2003, 02:37   #6 (permalink)
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ef falcons had a tendency to fry the diode in the pcm for the isc circuit. if you can get hold of a multimeter that measures duty cycle, you can check to see if the pcm is controlling it. duty cycle at idle should be between 40 to 50 percent. if no duty cycle is present or it does not change with power steer/ air con load then the pcm is your problem. just put a paper clip in the back of the wiring connector on the isc. from memory its the bottom wire of the two (someone correct me if i'm wrong) connect the positive lead of multimeter to paper clip and the negative lead to battery negative post.
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Old 02-24-2003, 07:17   #7 (permalink)
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Yep when ever ac is on you should notice a drop in revs and ecu compinsates for this if it does not, then its either ISC problem, or ECU, take it to a dyno tuner.
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