Mazda RX-8 Workshop Manual page 747

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2011 - RX-8 - Engine
NO.14 POOR FUEL ECONOMY [13B-MSP]
14 POOR FUEL ECONOMY
DESCRIPTION The fuel economy is unsatisfactory.
Contaminated air cleaner element
Air suction at intake-air system (between MAF sensor and intake ports)
Poor fuel quality
Inadequate fuel pressure
Pressure regulator (integrated in fuel pump unit) malfunction
Fuel pump relay stuck closed
Fuel leakage from fuel injector
Restriction in exhaust system
Erratic signal from eccentric shaft position sensor
Improper MAF sensor installation
Improper fuel injector control operation (abnormal signals from MAF, ECT,
A/F sensor, HO2S and IAT sensors to PCM)
KS malfunction (abnormal signal to PCM)
Contaminated MAF sensor
Improper engine compression
Engine internal malfunction
Abnormal engine oil condition (viscosity, deterioration)
Low oil pressure
Excessive fuel pressure