Re: 1998 Audi A4 1.8 - Engine is idling badly and stalls...
Is this sensor at the back of the bulk head under the inlet trucking. Are there two of them next to each other that look the same. If so that could be engine/coolant temperture sensor which would cause all sorts of engine running problems If not pluged into the wiring loom. Need more info for a better diagnoses.
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I'm assuming you mean a coolant temp sensor. The sensor tells the computer what the coolant temp is. Normally when a sensor fails the check engine light comes on to warn the driver. Normally but not always. One thing that could affect both problems you describe is the idle air control valve. If the valve fails or sticks, the engine can stall or have a high idle speed. The computer controls idle speed by how much air is allowed into the throttle body. The throttle body could also be very dirty.
Sounds like something is overheating then and possibly a sensor. Not familiar with Rovers but might be a problem with the CAS and/or CPS which tells the ECU the motor is running and when to fire. Also maybe the IAC is bad and when you go from throttle to idle it can't control it and allows it to die.
Hello dholland...The 2 most common stalling problems on this engine is a failing crankshaft position sensor, or a Powertrain Contol Module. Usually the stalling, and rough idle occur after engine warm up. You can inspect and clean the connector terminal to the crank sensor, sometimes this is the problem. Clear all fault codes. If codes return, then proceed with another scan and correction as needed. That would eliminate doubt.
This is caused by a faulty temp sensor, look at the top of the engine coming out of the head right near the distributor there is a coolant housing with a coolant line which should have one maybe two sensors one will be black (square with 2 to 4 wires) the other one will be blue. If yours only has one connector then disconnect it, start engine...the engine may idle higher than normal drive it till it warms up or to the point where it would normally stall, if it doesn't stall then replace the sensor and problem solved.
If you have two sensors, black one and blue one, its been awhile for me but disconnect one or the other, one of them is your temp gauge sending unit can't remember if its the blk one or blue one. But try that.
If you haven't done any tune-up for a while I would start with new set of plugs after that maybe even new spark plug wire set. It could be sensor for a gauge you may not even have. But you can always call the dealer ask for the service department and describe the part and the location.
Maybe a new fuel filter if you haven't replaced it for thirty thousand miles. Good luck.
vacuum leak......bad tps.......bad mass airflow meter system........any of those are suspect...... also check for bad ground at battery to be sure all is not computer freak out from bad readings ...good luck