Poor Fuel Economy

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

POSSIBLE CAUSE ACTION



Incorrect spark advance ^ Check Spark Controls,


Restricted exhaust ^ Check Catalytic Converter, Catalytic Converter


Incorrect Air-Fuel mixture ^ Check Air-Fuel ratio, perform injector balance test, inspect regulator operation (check vacuum line and return hose), check fuel pressure


EGR malfunction ^ Check EGR system, Exhaust Gas Recirculation


Air filter restricted ^ Clean or replace


Poor or contaminated fuel ^ Recommend higher grade fuel