Engine won't start
- Low battery
- Loose battery connections
- Loose or broken ignition wiring
- Moisture on spark plugs, distributor cap, or high voltage wires
- Wrong spark plug
- Split cover of the breaker-distributor or slider
- Dirt or water in the carburetor
- Empty fuel tank
- Defective fuel pump
- Defective starter
- Low compression in the engine cylinders
Engine stalls
- Incorrect idle adjustment
- Air leak from intake manifold
- Wrong ignition timing
Erratic idle
- Air leak from intake manifold
- Leakage through the cylinder head gasket
- Worn camshaft cams
- Defective fuel pump
- Loose crankcase ventilation hoses
- Incorrect idle adjustment
- Unequal compression in the engine cylinders
Misfire
- Incorrect spark plug gap
- Faulty ignition coil or ignition components
- Dirt or water in the carburetor
- Burnt valve
- Leakage through the cylinder head gasket
- The cover of the breaker-distributor is split
- Unequal compression in the engine cylinders
- Incorrect idle adjustment
Back flashes
- Incorrect idle adjustment
- Wrong ignition timing
- Air leak from intake manifold
- Valve stuck
Excessive oil consumption
- Worn pistons and cylinder bores
- Worn valve guides and valve stem seals
- Oil seeps through crankshaft seals, valve cover gasket, etc.
Insufficient engine power
- Wrong ignition timing
- Incorrect spark plug gap
- Low compression in the engine cylinders
- Excessive soot in the engine
- Air filter clogged
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