Possible Causes

Possible causes are:

• Camshaft Position (CMP) sensor malfunction
• CKP sensor malfunction
• Damaged vacuum hoses or improper connection
• EGR valve malfunction
• Engine malfunction
• Excess air suction in intake air system (between MAF/IAT sensor and dynamic chamber)
• Fuel filter clogged
• Fuel leakage in fuel line
• Fuel line clogged
• Fuel pressure regulator malfunction
• Fuel pump malfunction
• High-tension lead malfunction
• Ignition coil malfunction
• Insufficient compression
• Mass Airflow/Intake Air Temperature (MAF/IAT) sensor contamination
• PCM malfunction
• PCV valve malfunction
• Purge control solenoid valve malfunction
• Related connector and terminal malfunction
• Related wiring harness malfunction
• Variable valve timing control system improper operation