Mazda RX-8 Workshop Manual page 677

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2011 - RX-8 - Engine
NO.4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [13B-
MSP]
4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK
DESCRIPTION
The starter cranks engine at the normal speed but the engine requires
excessive cranking time before starting.
The battery is in the normal condition.
Vacuum leakage
Air leakage from intake-air system
Air suction at intake-air system (between MAF sensor and intake ports)
Air cleaner restriction
Improper operation of drive-by-wire control system
Drive-by-wire control system operates in fail-safe mode
Throttle body malfunction (stuck open)
SSV stuck open
SSV solenoid valve malfunction (stuck open)
APV stuck open
APV motor malfunction
APV position sensor No.1, No.2 malfunction
Poor fuel quality
Jet air mixing system malfunction (restriction or leakage in air passage)
Inadequate fuel pressure
Pressure regulator malfunction (integrated in fuel pump)
Fuel injector (FP) (RP) is clogged