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Bad 02 Sensor

posted by  someone claiming to be JimL on  Mon Apr 12 02:29 CST 2004 [RELATED]

The vacuum line sucks on the diaphragm in the FP regulator to cause it to lower the FP. If the diaphragm fails the FP will be too high causing a rich condition and (I suppose) problems for the O2 sensor. You can test the FP regulator diaphragm with a hand vacuum pump. Check the actual fuel pressure when runing with gauge setup.






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