[s-cars] Intermittent: Bad Idle, Stall & Black Smoke

[Emre Washburn]

Keith,

A bad water temp sensor can exhibit the symptoms you are experiencing.
They cost only $7.62 from SJM Auto, why not replace it?
<http://catalog.eautopartscatalog.com/sjm/022805/quote.jsp?clientid=sjm&cookieid=1LX1301LX1LX130PMI&baseurl=http://www.sjmauto.com/&partner=sjm&year=1995&product=C6020-30949&application=000899746>

Also, you may want to check your MAF. Last month I had a high boost
misfire, coupled with a rough idle that would not go away when I
borrowed two known good POSs and 5 known good coils. I swapped in a
friend's good MAF, and my car was a beast again. The car had been
running rich enough to make a stink, just ask Paul K and Jim P. as
they commented on my stinky car just before I left //S Fest '05 (my
sinus' was clogged, head cold, I couldn't smell it).

Also, if you decide to try a good MAF, reset your ECU. I didn't do
this and my car ran like hell for the 15 minutes of driving. I suspect
that the fuel trim form the old MAF in the ECU wasn't agreeing with
the good MAF.

HTH.

-- 
Emre
92 //S4
90 Cq
40 valves 'O plenty!

On 9/6/05, Keith Bedard <keith at castlegraphics.net> wrote:
> Car = 1995.5 S6
> Symptom = intermittent erratic idling, stalling, black exhaust smoke.
> What I have already changed = coil/plug boots, fuel pressure regulator
> (FPR), O2 sensor, fuel filter
> 
> I have owned this car for about 2.5 years.  This condition has been
> driving me insane for over a year.  When I first bought the car, this
> condition did not exist - car ran perfect.  I had the ECU chipped when
> I first bought it, and for quite some time, the performance was great.
> Then it started having the strange symptoms listed above.  It either
> runs fairly well (with none of those symptoms), or it runs horrible
> (with all of the symptoms appearing at once).
> 
> I had the VAG hooked up, and one of the possibilities the VAG suggested
> was high fuel pressure (which is why I changed the FPR, which had no
> affect).  When it is running poorly, much black smoke, fuel odor, seems
> to be burning too rich.  If I accelerate hard when it is in this poor
> run mode, I will sometimes get the rotten egg cat converter smell (I am
> a little nervous to hollow out the cat - new strict emissions in
> Massachusetts will certainly make car fail inspection if that is
> done)...
> 
> We disconnected each fuel injector and saw the idle change in a similar
> fashion on each one, which proved to us that the injector, POS, coil
> and plug boot are good on all 5 cylinders.
> 
> I have heard rumors that a bad Water Temp Sensor can cause some weird
> idle conditions.
> 
> Any BTDT, would be GREATLY appreciated!
> 
> Thanks!
> Keith Bedard
> Templeton, MA
> '95.5 S6
> '87 4kq
> 
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