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, 08:58 PM   #1
Registered User
1997 ZJ 
Join Date: Dec 2008
Location: , Alabama
Posts: 8,242
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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