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Condition Probably cause Corrective action
Others Incorrect valve clearance. Adjust.
Malfunction of the ignition system (spark Replace.
plug, high tension cable, ignition coil, etc.
Incorrect basic ignition timing. Adjust.
Faulty P.C.V. valve. Replace.
Clogged air cleaner filter. Replace air cleaner filter.
Loose manifold and cylinder head bolts. Retighten bolts.