32
Condition Probably cause Corrective action
ABNORMAL
COMBUSTION
(Backfire, afterfire,
run-on,etc.)
Improper ignition Improper ignition timing. Adjust.
timing
Improper heat range of spark plugs. Use specified spark plugs.
Fuel system out of Damaged throttle body or manifold gasket Replace damaged parts.
order
(backfire afterfire).
Leaky Injector or o-ring Replace faulty o-ring or injector
Clogged injector. Clean or replace.
Faulty cylinder head, Improperly adjusted valve clearance Adjust.
etc.
Excess carbon in combustion chamber. Remove head and clean of carbon.
Damaged valve spring (backfire, afterfire). Replace damaged part.
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