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BASIC SPARK PLUG TROUBLE SHOOTING CHARTS problem symptoms. For model-specific Trouble Shooting, CONDITION & POSSIBLE CAUSE CORRECTION Normal Spark Plug Condition Light Tan or Gray deposits No Action Electrode not burned or fouled No Action Gap tolerance not changed No Action Cold Fouling or Carbon Deposits Overrich air/fuel mixture Adjust air/fuel mixture, see ENGINE PERFORMANCE section Faulty choke Replace choke assembly, see ENGINE PERFORMANCE section Clogged air filter Clean and/or replace air filter Incorrect idle speed or dirty carburetor Reset idle speed and/ or clean carburetor Faulty ignition wires Replace ignition wiring Prolonged operation at idle Shut engine off during long idle Sticking valves or worn valve guide seals Check valve train Wet Fouling or Oil Deposits Worn rings and pistons Install new rings and pistons Excessive cylinder wear Rebore or replace
2008 Honda Civic EX GENERAL INFORMATION Trouble Shooting - Basic Procedures
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