With respect to testing the knock sensor, the Green Book manual for my 83 (first year for the knock sensor) says:
"Read ignition timing. Then use a hammer to tap on the cast iron boss on the engine right side, above the oil filter. Read ignition timing. It should be retarded by max. 6 degrees. It will return to normal automatically."
According to another section in the book, the retardation and return happens very rapidly.
--
Bob: Son's XC70, my 83 240, 89 745 (V8) and S90. Also '77 MGB and some old motorcycles
|