I have a similar issue in mine it doesn't turn off but when I turn on the A/C it drops my idle drastically and I was told that it is because there is too much freeon in it so do to the high pressure it causes the compressor to work harder causing a pull on the timing belt slowing it down.. Get it checked out there's nothing to loose ...Hope this helps

eclipse96dsm - A/C compressor is likely siezed and then stops everything from turning.

hector - Once your a/c is turned on a signal should be sent to the ecu that tells it to raise the idle, the only thing to much freon will do is make the a/c not work very well.

Had the same problem. My Biss wasnt adjusted properly. Simple as that. The ISC can aslo cause the engine to stall out when the ac turns on

well i know it has nothing to do with the ac compressor because im having trouble with idle to begin with. could it be possible that because my power steering cable is not connect it could do this?

update: can ISC,FIAV,CAS,or vacuum leak be the issue?

im just taking a crack at this but maybe you have a short somewhere and when you turn your a/c on its drawing power from somewhere else causing the car to shut off. does it shut off when you run your heat as well or any of your window defrosts?

nope only when i turn on the ac

I'm going to agree that your compressor is likely going bad. Mine does the same thing, it doesnt always shut off but it sure struggles to stay on. Even with there being no freon in the system it still has a very diffiuclt time. espically once you add to the system.

You really need to check your ISC (idle speed control) motor. WHY? When your ac comes on the rpms drop due to the compressor running, the isc opens up just a little bit more to compensate for it, allowing more air into the engine to maintain its idle. Take it off, clean it with carb cleaner and clean it good i promise it'll help. Hope this helps

gsxeclipse97 said:

I'm going to agree that your compressor is likely going bad. Mine does the same thing, it doesnt always shut off but it sure struggles to stay on. Even with there being no freon in the system it still has a very diffiuclt time. espically once you add to the system.

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gonna have to agree might just be your compressor. try draining the freon out of it and see how it runs or if it makes any diference...want the truth on fixing this? take it to a reputable mechanic and that should fix the problem!

will try all of the above. will keep you guys posted thanks

If the comperssor is good then it could be a problem with the pressure switch or isc. When the AC turns on, the ECU is supposed to increase the isc a bit to compensate for the increased load.

update: the car only turns off when the ac clutch kicks in. i know for a fact that its not the ac compressor already got it checked. what can cause that? i checked the ISC seems fine had my buddy lend me his that works. and does the same thing.

eclipse96dsm said:

update: the car only turns off when the ac clutch kicks in. i know for a fact that its not the ac compressor already got it checked. what can cause that? i checked the ISC seems fine had my buddy lend me his that works. and does the same thing.

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Your idle just may be too low. I was going to say too much refridgerant but that will just shut the a/c off and not the engine.

eclipse96dsm said:

update: the car only turns off when the ac clutch kicks in. i know for a fact that its not the ac compressor already got it checked. what can cause that? i checked the ISC seems fine had my buddy lend me his that works. and does the same thing.

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How do you know the compressor is good. What does your car idle at with the ac off. Do you have access to a scanner to see what your ISC position is at idle.

EDIT: Have you connected any gauges to the car to see what your high and low pressures are?

my regular idle is 1k i have cams 272 HKS. and everything was checked out my my boys shop hes a ASE master tech. still going no were with this