[s-cars] Rough running - need advice what to try next?

[chris chambers]

James,

If your oxygeon sensor is old I'd replace that first. 

Based on the fact that it happens after the car has warmed up makes
me want to look at the wiring to the coils. I'm picturing a crack in
the
wiring or a weak coil.

Good luck

Chris


--- James Murray <james.murray at ericsson.com> wrote:

> 
> Is my email getting through? I see nothing posted...
> 
> /J
> > _____________________________________________ 
> > From: 	James Murray  
> > Sent:	Monday, September 24, 2007 3:09 PM
> > To:	s-car-list at audifans.com
> > Subject:	Rough running - need advice what to try next?
> > 
> > List advice needed....
> > 
> > Patient: 93 UrS4
> > 
> > Symptoms: Once warmed up, car runs rough, loss of power
> (hesistation
> > and slight bucking on acceleration), as if running with one less
> > cylinder or not getting fuel...no check engine light illuminated
> (but
> > have not pulled codes yet). Car seems fine when first cold,
> starting
> > up. 
> > 
> > Procedures attempted: Swapped out coil pack, Spark Plugs, and WGFV
> (no
> > appreciable difference). Have tried pulling injector connectors on
> > each cylinder, just makes it worse at idle.
> > 
> > Next on the list of potential items to check:
> > 
> > 1. Oxygen Sensor
> > 2. Knock Sensors
> > 3. POS Device
> > 4. Fuel pump
> > 5. Injectors
> > 6. MAF
> > 
> > My number 1 candidate right now is the Oxygen Sensor... what is the
> > list advice? 
> > 
> > Cheers, /Jamu.
> _______________________________________________
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> 


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