CIS-E3 problems - temperature sensor?

[john at westcoastgarage.net]

Eyvind E. Spangen wrote:
> Hi!
>
> I have a problem with a CIS-E3 equipped car.
>
>
>
> Problem is - it won't run with the temperature sensor and the DPR plugged in
> at the same time. I have tried replacing the temperature sensor 3 times, but
> same happens every time. When I plug it in, the engine stalls. If I
> disconnect the temperature sensor, it will run with the DPR connected, but
> will be very hard to start when cold and warm (but below operating
> temperature).
>
>
>
> What could be wrong? I even bought the last temperature sensor at the
> dealer, it should really be right. Sounds weird that 3 different, new ones
> should be faulty..
>
>
>
> Somebody had messed with the mixture adjustment to cover up something else -
> CO was around 7% (!!) and I had to turn the adjustment screw about two turns
> CCW. Now it seems about right, but I suspect the O2 sensor is bad -
> replacement due for tomorrow. I just don't want to install a new O2 sensor
> when I'm not sure about the rest working ok, and I really can't understand
> this case with the engine temperature sensor..
>
>
>
> Installing a new O2 sensor and using the mA range to adjust the mixture
> according to the DPR current while having the temperature sensor unplugged
> will probably make it right, but won't solve why the car just stumbles and
> dies with the sensor plugged in..
>
>
>
> Winter is approaching, it would have been great to have a car that will
> start, run and idle properly, give good fuel economy and pass the emissions
> test.. ;)
>
>
>
> The car in question is an Audi A6 2.0 16V, euro-only, it's more or less the
> engine of the early 90s VW Golf GTI with CIS-E/CIS-E3 fitted into an A6, so
> all troubleshooting tips that apply to other CIS-E/CIS-E3 cars apply here
> too.
>
>
>
>
>
> Thanks!
>
> - E. Spangen
>
>
>
>
> Before throwing money at an O2 sensor, unplug it and see how it runs.  If it runs OK, then the O2 sensor could very well be the problem.  If not, look elsewhere first.  John