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


Incorrect distributor installed position See Adjustments.



Electronic spark timing
insufficient spark advance Refer to Computers and Control Systems.


Restricted exhaust See Catalytic Converter


Poor or contaminated fuel Recommend higher quality fuel



EVAP system malfunction See Evaporative Emissions Systemm


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.
Refer to Fuel Delivery and Air Induction.