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
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1997 ZJ 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,378
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.

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