Diagnostic Strategy

The steps listed in the following charts will provide a systematic evaluation of each component that could cause the malfunction. After completing a repair, repeat the test to ensure the malfunction has been eliminated.

Before performing any of the tests, make sure that the following related systems are operating properly:

• Basic carburetor adjustments.
• Mechanical engine operation (plugs, valves, rings).
• Ignition system.
• Intake manifold, carburetor or base plate gaskets.
• Loose vacuum hoses or fittings.