Strange idle problem

[boschmann]

The blue coolant temp sensor that has the wrong readings.

[Nexarius]

Originally Posted by boschmann

The blue coolant temp sensor that has the wrong readings.

Boschman, you are absolutely right. My grandfather disconnected the blue sensor and it solved the starting problem and the idle speed problem. For some reason it seems to be working fine with the sensor disconnected!!

We will try and source a new one.

Thanks Boschman for all your help! Us novices would be lost without experts like you giving up your time to help us, so Cheers!!

[spasticone]

did you change the o2 sensor?

[criada84]

Originally Posted by Nexarius

Im not sure what you mean by sensor, but we have replaced the "idle stabalisation valve" that connects to the air intake, and it made no difference

Guys, I have too an idlle problem. Can somebody help?
The car is a Passat 1992, automatic, 2L, 16 Valves, all equiped.
Idelle is OK at cold start-up for about 1 min. Then, it becomes more and more oscilating while the motor warms-up.
Also black smoke starts to come out from exhaust at idlle.
When the motor is hot, the idlle dies.
Another symptom is that the automatic transmissin, after reaching 100Km/h and going down, it does not change up unless I reach 4000 rpm.
Recently I have found the oxigen sensor wires broken. I have re-connected them, but no improvement. Did not check the fuse.
The exhaust system is not in a very good condition.
I do not feel the switch at the throttle valve, as I feel at my 1991 scraped Passat.
I have lots of parts from my 1991 Passat