Horizon L4-97 1.6L SOHC (1984)
Detonation (Knock) Sensor: Testing and Inspection
1.
Connect a suitable timing light to the engine.
2.
Start engine and increase speed to 1200 RPM.
3.
Connect a suitable vacuum pump to the vacuum transducer. Set pump to 16 inches vacuum.
4.
Tap on the manifold near the sensor. Using the timing light, check for a decrease in spark advance. The amount of decrease in timing is
proportional to the strength and frequency of the tapping. The greatest decrease in timing will be approximately 11 degrees.
