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Condition Probably cause Corrective action
ENGINE POWER NOT
UP TO NORMAL
Low compression Previously mentioned.
Ignition system out of Incorrect ignition timing Adjust.
order Damaged spark plugs. Clean, adjust or replace plugs.
Damaged spark plugs. Clean, adjust are replace plugs.
Fuel system out of Clogged fuel pipe or needle valve. Clean.
order Dirty or clogged fuel filter. Replace.
Fuel pump will not work properly. Repair or replace.
Air intake system out Clogged air cleaner. Clean or replace filer.
of order Air inhaling from manifold gasket or throttle body Replace gasket.
gasket.
Faulty P.C.V. valve. Replace.
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