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Accelerate engine to full throttle. If engine detonation occurs, initial ignition timing setting is too high, spark plugs are loose, gasoline octane rating is too low, fuel system pressure is too low or fuel injectors are clogged.
Accelerate engine to full throttle. If engine detonation occurs, initial ignition timing setting is too high, spark plugs are loose, gasoline octane rating is too low, fuel system pressure is too low or fuel injectors are clogged.