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

Tue Sep 25 16:17:19 PDT 2007

Hi Jamu,

If it can help diagnose your problem, you're more than welcome to come home
and swap any part with my S-Bitch or my Rossato bins content. As she's
collecting dust for now (thinking of planning on working on the Fiat for the
moment but mostly lazily doing nothing), you can even leave with the part
that solve the problem until you receive the replacement. AFAIK, everything
is fine on my car beside the compression. Beside, I have some spare parts
that I'll probably never use.

IMS-BitchE, as it's heat related:
- Coils: could be but no BTDT. You can swap my entire coil cover with coils
and wires and you'll have a quick easy answer. If it's a problem, I have a
full set of known good 190KKm old coils collecting dust because I replaced
all of them 5 years ago while the problem was elsewhere. If needed, you can
pick the whole set for the price of one so you'll have backup.
- Not the O2 sensor, which is usually bad when cold (heater fried) or all
the time (sensor fried). Beside, it doesn't run rough at the beginning, it
just suck gas like a souped up SUV. I think I have a new one in Rossato bins
if you still want to try it. Just don't cut the wires so I can reuse it if
you don't need it.
- Don't know for heat vs knock sensors but shouldn't affect idle or low
acceleration, AFAIK. You can still try mine (you don't want to replace them
just in case, they're not cheap) but I have no idea how to remove them.
- POS, could be heat related but usually die without warning sign (one
cylinder missing hot and cold). Mines are both good if you need to swap them
or for a temporary fix.
- Could be Fuel Pump. If it's the fuel pump, it should be much worse when
you floor it. Fuel pressure variation vs rpm will also tell you. You can
check the very neat permanent fuel pressure gauge Don installed in 5 min. on
the S-Bitch for 20$. You can even take it out and install it on yours, I'll
just replace it with a straight barbed connection as I now know my problem
is not related to fuel pressure.
- Injector problems are not heat related AFAIK but I have a full set of low
mileage ones Rossatoing in the garage if you want to try them (10 min.
install as seen at the last S-Fest).
- MAF, no idea, but mine is clean so you can swap it if you want.

I won't be at home this weekend but I can leave the S-Bitch and garage keys
to my neighbour so you can do whatever you want to the S-Bitch with no
witness, and you don't even need to bring your own tools. Or we can meet on
Wednesday, or Thursday and pick the keys as I'll have no time to work in the
garage or on the S-Bitch until October so I can live without the keys for a
few days.

Fortunately, this week-end is warm and sunny because you'll have to work
outside, the Fiat is taking the warm covered spot inside. However, there's
one place in my driveway where you should be able to park both urS side to
side (work with Fiat and urS though the Fiat is quite narrower) for easier,
faster swaps.

HTH,

Vincent.

-----Message d'origine-----
De : s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com] De la part de James Murray
Envoyé : 25 septembre 2007 13:02
À : chris chambers; Scar
Objet : Re: [s-cars] Rough running - need advice what to try next?

I swapped out all coils with a new pack... So unless it's the wiring
from the POS or the POS itself I don't think that's the problem :-(

/J. 

-----Original Message-----
From: chris chambers [mailto:fastscirocco_2000 at yahoo.com] 
Sent: Tuesday, September 25, 2007 12:24 PM
To: James Murray; Scar
Subject: Re: [s-cars] Rough running - need advice what to try next?

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.
> _______________________________________________
> S-CAR-List mailing list
> S-CAR-List at audifans.com
> http://www.audifans.com/mailman/listinfo/s-car-list
> 

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