Poor Fuel Economy

Fuel economy is noticeably lower than expected. Customer detects a significant reduction in fuel mileage.

POSSIBLE CAUSE ACTION

EGR malfunction See Exhaust Gas Recirculation System


Incorrect distributor installed position See Adjustments



Electronic spark timing
insufficient spark advance See Computers and Control Systems


Restricted exhaust See Three-Way Catalytic Converter


Poor or contaminated fuel Recommend higher quality fuel



EVAP system malfunction See Evaporative Emission Control System


TURBOCHARGER ENGINES

Turbocharger or wastegate control malfunction Check for damaged turbocharger
or seized turbocharger bearings.
Check for wastegate stuck open
or faulty wastegate control solenoid.
See Fuel Delivery and Air Induction