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bhlerman 12-06-2012 12:47 PM

Rough idle with AC on
I just had the timing belt and water pump replaced and plugs replaced along with some other repairs on my 1996 legacy outback 2.5l DOHC. Now the car idles rough when the AC is on (no problem before the repairs). Otherwise runs fine. The mechanic says the AC compressor may be going bad. I think it may have something to do with the timing belt. Any help?

monkeyposeur 12-07-2012 12:21 AM

My compressor is kind of messed up ever since I decided to be a dumbass and charge it with a can of refridgerant from the parts store. But it doesn't really affect my idle.

You say it runs fine otherwise. Does this mean that the idle is just fine when the AC is off, and when you turn the AC on it idles rough?

edit: Oops, you specify that it runs rough only when the AC is on. Maybe I shouldn't post after working double shifts.

Tr00b 12-07-2012 06:26 AM

Clean your iac it may not have enough airflow to compensate for the added demand of the compressor running.

bhlerman 12-07-2012 01:24 PM

After more checking I think it is the engine mounts. The idle is more of a vibration than rough. It happens only when the AC is on and the car is stopped and in drive or reverse. I would think if it is a problem with the timing belt adjustment the car would be running worse or not running.

G Man 12-07-2012 05:07 PM

I have to agree with the mecanic. probily a lack of oil in the pump.

bhlerman 12-17-2012 12:49 PM

The vibration is getting worse. Now it happens also when the AC is off (but is worse when AC is on). It happens when stopped and in gear with the brake on. When I had the work done on the car I also had both front axles replaced because the boots were bad. I have been reading on the internet that replacing the axles with rebuilt non Subaru axles can cause this. Doesn't make sense but it seems to be a reported problem after replacing the axles. I'm taking the car back to have it checked for motor mount problem. If that is not the problem then it is probably the axles. I don't want to spend the money again replacing the axles with expensive Subaru axles. Would it be a problem to not replace the axles and live with the vibrations?

Stang70Fastback 12-17-2012 04:38 PM

I've had the axle vibration issue for... many years now... and nothing has blown up yet, so I think you're fine.

I was speaking to a friend mechanic who told me that this "axle nonsense" can actually be fixed by adjusting the wishbone... or dogbone... I think he said it was at the rear of the engine near the tranny. Does anyone know what he was referring to?

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