REF•12 Fault finding
Engine (continued)
mm Worn or incorrectly adjusted contact breaker points (Chapter 5B).
mm Fuel pump faulty, or delivery pressure low (Chapter 4A or 4B).
mm Fuel tank vent blocked, or fuel pipes restricted (Chapter 4A or 4B).
mm Carburettor float chamber flooding (float height incorrect) -
carburettor models (Chapter 4A).
mm Vacuum leak at the carburettor/throttle body, inlet manifold or
associated hoses (Chapter 4A, 4B or 4C).
mm Worn, faulty or incorrectly-gapped spark plugs (Chapter 1).
mm Faulty spark plug HT leads (Chapter 1).
mm Distributor cap cracked or tracking internally (where applicable)
(Chapter 1).
mm Faulty ignition coil or ignition module (Chapter 5B).
mm Incorrect valve clearances (Chapter 2A).
mm Uneven or low cylinder compressions (Chapter 2A).
mm Blocked injector/fuel injection system fault - fuel injected models
(Chapter 4B).
Engine hesitates on acceleration
mm Worn, faulty or incorrectly-gapped spark plugs (Chapter 1).
mm Vacuum leak at the carburettor/throttle body, inlet manifold or
associated hoses (Chapter 4A, 4B or 4C).
mm Incorrect idle speed and mixture adjustment - carburettor models
(Chapter 4A).
mm Choke mechanism incorrectly adjusted, worn or sticking -
carburettor models (Chapter 4A).
mm Worn or incorrectly adjusted contact breaker points (Chapter 5B).
mm Blocked injector/fuel injection system fault - fuel injected models
(Chapter 4B).
Engine stalls
mm Vacuum leak at the carburettor/throttle body, inlet manifold or
associated hoses (Chapter 4A, 4B or 4C).
mm Incorrect idle speed and mixture adjustment - carburettor models
(Chapter 4A).
mm Choke mechanism incorrectly adjusted, worn or sticking -
carburettor models (Chapter 4A).
mm Carburettor float chamber flooding (float height incorrect) -
carburettor models (Chapter 4A).
mm Fuel filter choked - fuel injected models (Chapter 1).
mm Fuel pump faulty, or delivery pressure low (Chapter 4A or 4B).
mm Fuel tank vent blocked, or fuel pipes restricted (Chapter 4A or 4B).
mm Blocked injector/fuel injection system fault - fuel-injected models
(Chapter 4B).
Engine lacks power
mm Timing chain incorrectly fitted (Chapter 2A).
mm Incorrect idle speed and mixture adjustment - carburettor models
(Chapter 4A).
mm Incorrect ignition timing (Chapter 5B).
mm Fuel filter choked - fuel-injected models (Chapter 1).
mm Fuel pump faulty, or delivery pressure low (Chapter 4A or 4B).
mm Incorrect valve clearances (Chapter 2A).
mm Uneven or low cylinder compressions (Chapter 2A).
mm Worn, faulty or incorrectly-gapped spark plugs (Chapter 1).
mm Vacuum leak at the carburettor/throttle body, inlet manifold or
associated hoses (Chapter 4A, 4B or 4C).
mm Blocked injector/fuel injection system fault - fuel injected models
(Chapter 4B).
mm Brakes binding (Chapters 1 and 9).
mm Clutch slipping (Chapter 6).
Engine backfires
mm Timing chain incorrectly fitted (Chapter 2A or 2B).
mm Vacuum leak at the carburettor/throttle body, inlet manifold or
associated hoses (Chapter 4A, 4B or 4C).
mm Incorrect ignition timing (Chapter 5B).
mm Blocked carburettor jet(s) or internal passages - carburettor
models (Chapter 4A).
mm Blocked injector/fuel injection system fault - fuel injected models
(Chapter 4B).
Oil pressure warning light illuminated with engine
running
mm Low oil level, or incorrect oil grade (Chapter 1).
mm Worn engine bearings and/or oil pump (Chapter 2B).
mm High engine operating temperature (Chapter 3).
mm Oil pressure relief valve defective (Chapter 2B).
mm Oil pick-up strainer clogged (Chapter 2B).
Engine runs-on after switching off
mm Excessive carbon build-up in engine (Chapter 2B).
mm Incorrectly adjusted idle speed (Chapter 4A).
mm Incorrect ignition timing (Chapter 5B).
mm High engine operating temperature (Chapter 3).
mm Fuel injection system fault - fuel injected models (Chapter 4B).
Engine noises
Pre-ignition (pinking) or knocking during acceleration or
under load
mm Ignition timing incorrect/ignition system fault (Chapters 1 and 5B).
mm Incorrect grade of spark plug (Chapter 1).
mm Incorrect grade of fuel (Chapter 1).
mm Vacuum leak at the carburettor/throttle body, inlet manifold or
associated hoses (Chapter 4A, 4B or 4C).
mm Excessive carbon build-up in engine (Chapter 2B).
mm Blocked injector/fuel injection system fault - fuel injected models
(Chapter 4B).
Whistling or wheezing noises
mm Leaking inlet manifold or carburettor/throttle body gasket
(Chapter 4A or 4B).
mm Leaking exhaust manifold gasket or pipe-to-manifold joint
(Chapter 4C).
mm Leaking vacuum hose (Chapters 4A, 4B, 4C, 5B and 9).
mm Blowing cylinder head gasket (Chapter 2A or 2B).
Tapping or rattling noises
mm Incorrect valve clearances (Chapter 2A).
mm Worn timing chain tensioner, valve gear or camshaft (Chapter 2A
or 2B).
mm Ancillary component fault (water pump, dynamo, alternator, etc)
(Chapters 3, 5A, etc).
Knocking or thumping noises
mm Worn big-end bearings (regular heavy knocking, perhaps less
under load) (Chapter 2B).
mm Worn main bearings (rumbling and knocking, perhaps worsening
under load) (Chapter 2B).
mm Piston slap (most noticeable when cold) (Chapter 2B).
mm Ancillary component fault (water pump, dynamo, alternator, etc)
(Chapters 3, 5A, etc).
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