Possible Causes

Malfunction is detected when one cylinder misfires or multiple cylinders misfire. Possible causes are:

• Improper spark plug.
• Insufficient compression.
• Incorrect fuel pressure.
• Injector circuit is open or shorted.
• Defective fuel injectors.
• Intake air leak.
• Ignition secondary circuit is open or shorted.
• Lack of fuel.
• Defective drive plate or flywheel.
• Defective front HO2S.
• Incorrect PCV hose connection.