choppy idle problem

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Mar 25, 2003 | 06:46 PM

simply J

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choppy idle problem

when idling my rpm's jump around between 900 and 1000 rpms and the car vibrates a lot when the rpms dip. Any idea what could be causing this? TIA

Mar 25, 2003 | 06:53 PM

Yippers®

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Vacuum leak, bad spark plugs, weak coil pack(s), carbon build up in the cumbustion chambers, weak

ignition amplifier, pinholed or carbon tracked boots on the bottom of the Coil Pack(s). Try a TBA ?

Mar 25, 2003 | 06:59 PM

201-A4

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Re: TBA?

Mar 25, 2003 | 07:02 PM

Yippers®

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Throttle Body Alignment

Mar 25, 2003 | 07:12 PM

201-A4

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Ah yes, how obvious.

Mar 25, 2003 | 07:52 PM

iota

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TBA is the first thing I'd do. I had the same problem, TBA (and auto trans adapt.) fixed it right up

Mar 25, 2003 | 07:57 PM

Crisqo09 T.O.

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What is Auto trans. adapt?

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Mar 25, 2003 | 09:24 PM

ThirdEye

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mine too! exact same problem trying to figure out what's wrong(more)

does it no happen all the time, just occasionaly when idling? I think it might be the throttle position sensor gone bad in the TB but I gotta check first.

Mar 26, 2003 | 04:35 AM

#10

RAD69

AudiWorld Super User

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From: Central NJ

I just delt with this problem...

My friend who owns a shop had a customer car - 97 1.8T w/ 113k miles that had the same problem. He told me that they did not know what is wrong and "why don't you fix it for me - Mr. Audi..."

Anyway - There were a coupla DTCs for Throttle body issues. I simply cleaned the throttle body which had heavy deposits - The butterfly valve could not even close all the way.

Well - they laughed at me for thinking it only needed to be cleaned, but that fixed the problem. BTW - but I did an adaptation when I was done and replaced the vacum lines - the OEM ones seem to fall apart after a few years.