ENGINE RUNS, BUT
MISSES
(Cont.)
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If a good spark does not occur, the trouble is in the secondary cir-cuit of the system. Check the spark plug wire and the distributor cap.
If a good spark occurs, check the spark plug. If the spark plug is not at fault, a mechanical component of the engine is probably at fault.
Engine
Intake manifold gasket leak.
Perform a compression test to de-termine which mechanical compo-nent of the engine is at fault.
MISSES ERRATICALLY AT ALL SPEEDS
Exhaust system
Exhaust system restricted.
Ignition system
Breaker points not properly adjusted.
Defective breaker points, condenser, secondary wiring, coil or spark plugs.
High tension leakage across the coil, rotor or distributor cap.
Defective Ignition switch.
Fuel system
Float setting Incorrect.
Fuel inlet system not operating properly.
Dirt or water in the fuel lines or carburettor.
Restricted fuel filter.
Loose booster venturi.
Cooling system
Check the cooling system for In-ternal leakage and/or for a condi-tion that prevents the engine from reaching normal operating tempera-ture.
Engine
Perform a compression test to de-termine which mechanical compo-nent of the engine is at fault.
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MISSES AT IDLE ONLY
Fuel system
Idle fuel mixture needle not prop-erly adjusted.
Restriction in idle fuel system.
Ignition system
Excessive play in the distributor shaft.
Worn distributor cam.
Engine
Valve clearance set too tight. Worn camshaft lobe(s).
Perform a compression test to de-termine which mechanical compo-nent of the engine is at fault.
MISSES AT HIGH SPEED ONLY
Fuel system
Power valve or passages clogged or damaged.
Low or erratic fuel pump pressure.
Fuel Inlet system not operating properly.
Restricted fuel filter.
Restricted main fuel system.
Positive crankcase ventilation system restricted or not operating properly.
Cooling system
Engine overheating.
Engine
Perform a compression test to de-termine which mechanical compo-nent of the engine is at fault.
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