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Rough idle and stalling, already cleaned TB

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Old Nov 19, 2006 | 05:10 PM
  #1  
charlesharrison's Avatar
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Joined: Nov 2006
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Default Rough idle and stalling, already cleaned TB

Hi all,

I have a '97 A4 1.8T Quattro with 98K miles and have been having an issue recently with rough idling and stalling. The car pretty much is always rough idling now. The stranger problem to me is that when I'm coming to a stop, or slowing down enough to turn onto another street, the engine nearly stalls (sometimes does stall, but usually the RPMs bounce back up after nearly stalling). Sometimes this happens right away, and sometimes it takes a few minutes of driving before the issue starts. I was told that it was likely a gunked up throttle body, but I cleaned it today and the problem did not change at all. The car operates normally when already moving and accelerating. There aren't any check engine lights or anything else.

Any ideas?
 
Old Nov 19, 2006 | 05:22 PM
  #2  
wood_e's Avatar
3rd Gear
Joined: Feb 2006
Posts: 1,764
From: Ames, IA
Default RE: Rough idle and stalling, already cleaned TB

Clean the idle control valve (ICV)
 
Old Nov 26, 2006 | 01:57 PM
  #3  
dankhound's Avatar
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Joined: Oct 2005
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Default RE: Rough idle and stalling, already cleaned TB

Check for vacuum leaks.
 
Old Nov 26, 2006 | 01:58 PM
  #4  
BzeA4's Avatar
2nd Gear
Joined: Jul 2005
Posts: 600
From: NW Burbs of Chicago
Default RE: Rough idle and stalling, already cleaned TB

could be your maf. might want to clean that too, but be careful when cleaning it. theres a write up somewhere.
 
Old Nov 26, 2006 | 02:33 PM
  #5  
techbod's Avatar
Joined: Nov 2005
Posts: 12,826
From:
Default RE: Rough idle and stalling, already cleaned TB

ISC how to check it

[IMG]local://upfiles/12092/2B1181A0243D4C06881C3B7180752CE9.jpg[/IMG]

[IMG]local://upfiles/12092/9B0D74C51C8A4D53ACD5FEDA87A01668.jpg[/IMG]
 
Old Nov 27, 2006 | 01:22 PM
  #6  
acetrebo's Avatar
4th Gear
Joined: Nov 2005
Posts: 3,393
From: Columbus Ohio
Default RE: Rough idle and stalling, already cleaned TB

He's a 1.8t.

He doesn't have an ICV. Only the 6 cyl has it.


ORIGINAL: wood_e

Clean the idle control valve (ICV)
 
Old Nov 27, 2006 | 01:26 PM
  #7  
acetrebo's Avatar
4th Gear
Joined: Nov 2005
Posts: 3,393
From: Columbus Ohio
Default RE: Rough idle and stalling, already cleaned TB

I would try to read codes anyway.

If it is misifiring, then there are codes.

If you are unable to get the codes read, you could always try to reset the ECU and let it reset everything.

Just pull neg battery cable for five mins. Then, allow a good 100 miles and see if it smoothes out. If not, go get a code reader or use the sticky posts to find someone with a vag-com near you.



ORIGINAL: charlesharrison

Hi all,

I have a '97 A4 1.8T Quattro with 98K miles and have been having an issue recently with rough idling and stalling. The car pretty much is always rough idling now. The stranger problem to me is that when I'm coming to a stop, or slowing down enough to turn onto another street, the engine nearly stalls (sometimes does stall, but usually the RPMs bounce back up after nearly stalling). Sometimes this happens right away, and sometimes it takes a few minutes of driving before the issue starts. I was told that it was likely a gunked up throttle body, but I cleaned it today and the problem did not change at all. The car operates normally when already moving and accelerating. There aren't any check engine lights or anything else.

Any ideas?
 
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