Engine idle RPM drops when using windows or AC

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Aug 9, 2011 | 04:43 AM

Mumawalde

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Engine idle RPM drops when using windows or AC

I've searched this topic for a while but haven't had any luck finding anything.

My '01 A4 1.8T has done this since I purchased it (used)

When the car is idling and I roll the windows down, the engine drops in rpm. Almost like the electrical load causes the engine to slow. I really don't think that window motors should do that. It does it on all 4 windows, and it's mostly pronounced once the windows is all the way up or down and the motor stalls.

Also, putting the AC on causes the idle to drop pretty significantly as well; to the point where I keep my foot on the gas just to keep it up to normal.

Any ideas?

Thanks

Aug 9, 2011 | 10:04 AM

turbo510

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Joined: Jun 2008

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From: Fallbrook, CA

Sounds like the throttle motor isn't opening the throttle plate enough to compensate.

Aug 15, 2011 | 09:59 AM

Mumawalde

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How do I check the throttle motor? Is there a procedure posted somewhere?

Aug 15, 2011 | 11:08 AM

4Driver4

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Joined: Oct 2002

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VAG-COM is your friend.

May 16, 2012 | 03:42 PM

Mumawalde

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Audiworld Junior Member

Joined: Nov 2008

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is the throttle motor in the throttle body?

I still have this problem. I tried tuning it with VAG-COM, nothing..

I think it's time to change the motor. Is it part of the throttle body?

Also, will a swap out require VAG-COM intervention or will the ECU figure out what's going on?