Common Causes for Misfire DTCs -
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Go Back > General Technical Discussions > Engines & Drivetrain > Common Causes for Misfire DTCs

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Unread 02-06-2011, 07:58 PM   #1
Registered User
1997 ZJ 
Join Date: Dec 2008
Location: , Alabama
Posts: 7,908
Common Causes for Misfire DTCs

• Worn spark plugs
• Cracked distributor caps
• Out of Phase distributor/rotor
• Shorted rotors
• Leaking plug wires
• Low fuel pressure
• Low compression
• Sticking valves
• Broken valve springs
• Worn cam lobes
• Incorrect valve or ignition timing
• Leaking EGR
• Vacuum leaks
• Leaking Injectors
• Clogged Injectors
• Contaminated fuel
• Low fuel tank level
• Excessive EVAP purge
• Low ignition system primary voltage
• Cracked coils
• Plugged exhaust
• Excessive PCV flow
• Wiring Harness
• Faulty PCM

Since the Misfire DTCs cause us Jeepers so much grief. Many of these are cheap and easy.

P0300 P0301 P0302 P0303 P0304 P0305 P0306 P0307 0308

ZeeJay1997 is offline   Reply With Quote Quick reply to this message

cel , ignition circuit , mil

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