idle questions

**bOOOOstedAudi** · 08-02-2004 10:48 PM

When I was in Cali my car started to idle roughly when I have the ac on. It doesn;t do this when its off but its annoying. I was thinking maybe it was the oil I put in but i doubt it. I usually use Castrol Syntec but for the first time evr I used Mobil 1 0w 30. What could possiblely be wrong?

**SEXICÄN** · 08-02-2004 11:19 PM

your car has to make extra juice to support the AC, and will cause your car's needle to just a bit. Nothing to worry about. If you want to make sure, try letting your car idle, and either turn the steering wheel, or(While the windows are up) just try and close them, your needle will jump around too.

**littlewhite** · 08-02-2004 11:49 PM

Originally posted by bOOOOstedAudi
When I was in Cali my car started to idle roughly when I have the ac on. It doesn;t do this when its off but its annoying. I was thinking maybe it was the oil I put in but i doubt it. I usually use Castrol Syntec but for the first time evr I used Mobil 1 0w 30. What could possiblely be wrong?

i use mobil ow40 winter time. Since CA is quite warm, try movin up to 5w30 or 10w40

**xburbx** · 08-03-2004 05:52 AM

its normal, mine does the same thing

**Devious27t** · 08-03-2004 08:39 AM

Originally posted by bOOOOstedAudi
When I was in Cali my car started to idle roughly when I have the ac on. It doesn;t do this when its off but its annoying. I was thinking maybe it was the oil I put in but i doubt it. I usually use Castrol Syntec but for the first time evr I used Mobil 1 0w 30. What could possiblely be wrong?

if you have access to a vag-com check your maf readings and find someone with a similar setup to compare data with. i was having idle issues and it turned out to be a bad maf and primary o2 sensor. woo hoo yeay 2000 maf recall oh well at least i get one for free.

**DRA4** · 08-03-2004 10:21 AM

mine does that from time to time.

**imsosure** · 08-03-2004 10:50 AM

My car is doing the same thing with A/C on. I noticed that the vacumm pressure is less when I have the A/C on than without.

It's idling much more roughly than normal. I can see the steering wheel vibrate with the A/C on at idle.

**nizmosx** · 08-03-2004 10:58 AM

normal, and i agree with moving your steering wheel all the way to either right and left and watch the needle, it will move irratic. totaly normal and have nothing to wory about.

**bOOOOstedAudi** · 08-03-2004 11:15 AM

i knew it was somewhat normal but when i noticed it it was really shaking.

**TheDude** · 08-04-2004 12:08 PM

Mine shakes even when the AC is off. It idles low at like 700 rpm. Also the check engine light is on. I VAG'ed it and it came out with and idle response error. I think i might try changing the spark plugs, im not sure if that will fix the problem.

**Devious27t** · 08-04-2004 12:21 PM

Originally posted by TheDude
Mine shakes even when the AC is off. It idles low at like 700 rpm. Also the check engine light is on. I VAG'ed it and it came out with and idle response error. I think i might try changing the spark plugs, im not sure if that will fix the problem.

just a random thought but you might try a throttle body adaptation