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Detonation Sensor Test

NOTE: Detonation sensor is used only on Calif. V8 engines.
  1. Connect a variable timing light to engine. Start engine and run it on second highest step of fast idle cam (at least 1200 RPM).
  2. Tap lightly on intake manifold near the sensor with a small metal object. Using the timing light, look for a decrease in timing. The amount of decrease will be directly proportional to the strength and frequency of the tapping.
  3. If sensor fails to perform as specified, replace sensor and repeat test. If new sensor still fails to perform properly, check wiring back to computer.
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