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5.1 Starting

There are three main requirements for starting the engine:
1. The starting system (battery and starter) must provide adequate engine cranking speed.
2. The ignition system must function properly.
3. The fuel system must correctly deliver fuel.

Observing the symptoms of a starting problem will give clues to its cause. Too low cranking speed indicates problems with the electrical system-probably the battery or starter. Further troubleshooting should focus on the electrical system-tests of the ignition or fuel systems at this point would be meaningless. See ELECTRICAL SYSTEM.

An engine that cranks normally is confirmation that the battery and starter are fine, so starting problems suggest an ignition or fuel system problem. If there is no sign whatsoever of starting, make sure there is adequate fuel in the tank. On gasoline engines, check for loose wires around the coil and distributor. Check to see that the distributor cap and spark plug wires are dry.

Unless this basic inspection turns up a cause, the cause could be in either the ignition system or the fuel system. For gasoline engines, the ignition system is the more likely culprit and is also easier to evaluate. The condition and function of the ignition system should always be confirmed before suspecting the fuel system. For diesel engines, the most likely cause of starting trouble is the glow plugs. For either gasoline or diesel engines, see IGNITION. If troubleshooting of the ignition or glow plug system indicates that all is well, proceed to FUEL SYSTEM.

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