Poor gasoline mileage
Perform troubleshooting referring to the followings when ECM has detected no DTC and no abnormality has been found in Visual Inspection:M13A with VVT and Engine Basic Inspection:M13A with VVT .
Condition Possible Cause Action
Poor gasoline mileage
Leaks or loose connection of high-tension cord
Faulty spark plug (improper gap, heavy deposits and burned electrodes, etc.)
Malfunctioning EGR valve
High idle speed
“Improper Engine Idling or Engine Fails to Idle” under Engine Symptom Diagnosis:M13A with VVT
Poor performance of TP sensor, ECT sensor or MAF sensor
Faulty fuel injector(s)
Faulty ECM
Low Compression
“Low Compression” under Engine Symptom Diagnosis:M13A with VVT
Poor valve seating
Dragging brakes
Slipping clutch
Thermostat out of order
Improper tire pressure
“Replacement Tires” under Tires Description
Camshaft position control (VVT) system out of order