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Replace the coolant temp sensor 200 1989

posted by  someone claiming to be George on  Thu May 24 11:00 CST 2007 [RELATED]

You probably know that the mixture is electronically controlled by the ECU and feedback that it receives from the coolant temp sensor, air mass meter, and oxygen sensor.

It is safe to rule out the oxygen sensor, IMO, because ALL of the readings are off. A 'bad' coolant temp sensor is a more likely culprit than a 'bad' air mass meter. A faulty air mass meter would result in an overly lean mixture upon acceleration, and very little power. Also, a 'bad' coolant temp sensor will tell the ECU that your engine is 'cold' and the ECU responds to this by richening the A/F mixture.






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New Too rich on acceleration....failed emission test [200]
posted by  a Volvo believer subscriber  on Tue May 22 10:50 CST 2007 >


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