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DIAGNOSTIC PROCEDURE NO.4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK (MZI-3.7) POSSIBLE CAUSE Spark plug malfunction Air leakage from intake-air system Erratic signal from CKP sensor Erratic signal from CMP sensor Improper air/fuel mixture ratio control Air cleaner restriction Improper operation of electronic throttle control system PCV valve malfunction Inadequate fuel pressure Purge solenoid valve malfunction MAF sensor contamination Incorrect MAF sensor GND voltage Restriction in exhaust system Pressure regulator malfunction (built-in fuel pump unit) WARNING: The following troubleshooting flow chart contains the fuel system diagnosis Fuel vapor is hazardous. It can easily ignite, causing serious injury Fuel line spills and leakage are dangerous. Fuel can ignite and cause (See BEFORE SERVICE PRECAUTION [MZI-3.7] .) (See AFTER SERVICE PRECAUTION [MZI-3.7] .) CAUTION: Disconnecting/connecting quick release connector without cleaning it
2008 Mazda CX-9 Grand Touring 2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
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