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Old 08-21-2002, 21:30   #1 (permalink)
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Question Air con troubles

hey guys,
when ever my air con comes on whilst the car is idleing it is like the car is about to stall. its fine whilst driving along, but when you change gears or whilst the car is idleing the revs fall very quick like it is about to stall. ie whilst at idle it normally sits around 600 - 800 rpm but when the air con comes on its down near 500ish or below. i thought that the idle was supposed to go up when the air con came on?????
just thought i would ask b4 i take it into the dealer

Tim
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Old 08-21-2002, 22:18   #2 (permalink)
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Yeah it should, whats happens when you roll the car in neutral at idle and steer? im pretty sure the EEC bumps the idle to compensate for the load on the engine with the P/S too.

Either the EEC is not receiving the extra load signal from the A/C and/or P/S, the EEC isn't sending the signal to the ISC or the ISC is dirty/stuffed

could be somthing unplugged somewhere?

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Old 08-22-2002, 05:24   #3 (permalink)
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could also be a very minor vacuum leak
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Old 08-22-2002, 06:09   #4 (permalink)
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thanks guys. i have the day off tomorrow so i will check these things out.
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Old 08-22-2002, 20:05   #5 (permalink)
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I had a bad bearing in an a/c which caused a grinding noise under load and grumpy idle. There should be an A/C switch (like the power steering switch) which tells the ECU when the A/C is running. See if it shows up on the self-diagnosis.

Good luck with it.
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Old 08-22-2002, 22:54   #6 (permalink)
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ok. i checked the isc unit and it tested ok. it has the right resistance acording to the book. and i also tested the voltage coming from the ecu and this is fine too. the isc its self didnt look that dirty but i will clean it tomorrow with some carby cleaner. Also the revs die down with the air con on aswell as when i move the steering when the car is idleing.

i did a check of all the vacum hoses aroung the manifold and could not find any disconnected or any that apperead to be damaged.

i will try cleaning it and if that doens work i recon i will put it in to the ford dealer to get fixed.

Its a bloody pain in the ass when using the air con and the car wants to stall all the time
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Old 08-23-2002, 04:45   #7 (permalink)
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make sure that the A/C pump is operating properly. If the pump is seized (stuffed) it will affect the idle and can also blow the main fuse, and so nothing works. Trust me I know this!

Keep the rubber side down
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