Technical Definition:

Engine Misfire Detected on Startup (First 1000 Revolutions)

Technical Description:

Possible Causes:

• Damaged or defective Crankshaft Position Sensor (CKP)
• CKP sensor wiring or connector fault
• Poor fuel quality
• Ran out of fuel
• Ignition system malfunction
• Fuel system malfunction: injector or fuel pump
• Mechanical engine problem
• Damaged PCM

Possible Symptoms:

• MIL (Malfunction indicator lamp) illumination
• Rough engine start or idle

Engine Misfire Detected on Startup

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Crankshaft Position (CKP)
– Crankshaft Position (CKP) sensor harness is open or shorted
– Crankshaft Position (CKP) sensor circuit poor electrical connection
– Ignition System
– Fuel Injectors
– Running out of fuel
– Fuel Quality
– Faulty Engine Control Module (ECM)

Specific Makes:

– Engine fails to start
– Engine runs rough