Grand Fury/Salon V8-318 5.2L VIN R (1985)
Detonation (Knock) Sensor: Testing and Inspection
Fig. 3 Detonation sensor location
1.
Connect a suitable timing light to engine.
2.
Set parking brake. Start engine and position throttle on second step of fast idle cam (at least 1200 RPM).
3.
Using a suitable hand operated vacuum pump, apply 16 inches of vacuum to Spark Control Computer transducer.
4.
Using a small metal object, tap lightly on the intake manifold near the detonation sensor, Fig. 3. At the same time, using timing light, look for a
decrease in spark advance at the timing marks. The decrease is proportional to the strength and frequency of the tapping. 20° is the maximum
timing decrease.
5.
Kick engine down to normal idle speed and turn ignition Off. Remove timing light and vacuum pump.