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92' 944 Non-Turbo concerned about the oil analysis

posted by  Bill J. on  Thu Oct 31 15:40 CST 2002
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last visit: Sat Oct 20 02:07 CST 2001
[RELATED]

Diagnosis from my certified Volvo/Mercedes technician of 35+ years experience: "Bad Oxygen Sensor". On the earlier cars (this is a 92') a slowly failing (130K+ miles)will not set a code. The aging sensor cannot keep up with quickly changing engine management functions, and so the extra rich condition, as evidenced by slowly decreasing gas mileage, and the oil test results.

With a new oxygen sensor installed the car runs great. The gas mileage is back up, maybe even better than the last 50K.

The fuel pressure regulator was fine.

--
92-944, 94-944, 97-960 - Amsoil lubes throughout,, Silverstar headlights, Green Diamond Tires






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