Poor Fuel Economy

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

POSSIBLE CAUSE ACTION

EGR malfunction, Check EGR system in TESTING
Flange gasket leaking, PROCEDURES
solenoid and thermo valves
malfunctioning



Ignition timing Check Ignition Timing in ADJUSTMENT
PROCEDURES



Spark timing Check Spark Controls (EST/ESC) in
COMPUTERIZED ENGINE CONTROLS



Restricted exhaust Check Catalytic Converter in
TESTING PROCEDURES