Common Causes for Misfire DTCs -
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post #1 of 1 Old 02-06-2011, 08:58 PM Thread Starter
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1997 ZJ 
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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

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ZeeJay1997 is offline  

cel , ignition circuit , mil

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