[s-cars] rough idle

[chris chambers]

Martin,

A rough idle can be caused by many things:

1. vacuum/boost leak
2. weak spark plugs
3. dirty idle stabalizer
4. etc.

I recommend you start by cleaning the idle stabalizer, if you look at the boost hose that connects
to the intake manifold it splits into a T with the smaller hose connecting to the right onto the idle
stabalizer. The idle stabalizer has an electrical connection and two hose connections, disconnect these
remove the stabalizer and clean it with carburater/fuel injector cleaner.

Hopefully after reinstalling your idle will smooth out.

HTH
Chris

 


----- Original Message ----
> From: Martin Baggenstos <martin.baggenstos at gmail.com>
> To: s-car-list at audifans.com
> Sent: Thursday, July 30, 2009 11:16:13 AM
> Subject: [s-cars] rough idle
> 
> Hello everyone,
> 
>   I am hoping someone might have some insight into why I am getting a rough
> idle on my 1995 S6. My car has most of the RS2 mods (MRC chip, turbo, FMIC,
> manifold, etc) When at idle, the engine runs rough and it is worst if the AC
> is off and, after about 10 seconds, the check engine light will come on, but
> goes off if I hit the gas. The car will not stall but just runs rough at
> idle. The only things I have change recently is a bad HO coil from the 034
> kit which was giving me problems more under boost. I also recently replaced
> the MAF to turbo hose with the silicone 034 hose for my Rs2 turbo and have
> read some some reports that large silicone MAF to turbo hoses could cause a
> rough idle, but I believe that this one is designed for my turbo. Could it
> be related to a bad O2 sensor? I also have a digital A/F monitor and at idle
> it reads numbers as low as 10-15 when this probelm occurs leading me to
> believe that the car is running very lean.
> 
> Martin
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