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Home >> Pontiac >> 1992 >> Grand Prix V6-204 3.4L DOHC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> - Diagnosis By Symptom >> Poor Fuel Economy

Poor Fuel Economy


Fuel economy is noticeably lower than expected. Customer should drive vehicle and note miles per gallon decrease.

POSSIBLE CAUSE ACTION


Restricted exhaust Check Catalytic Converter. Refer to EMISSION CONTROL DEVICES/DIAGNOSIS, TESTING AND INSPECTION PROCEDURES/TESTING PROCEDURES/CATALYTIC CONVERTER.




Poor or contaminated fuel Recommend higher grade fuel



Other mechanical problems Check for overheated engine, slipping transmission or clutch, dragging brakes etc.