Quote:
Originally Posted by Laird Scooby
Try running it on decent petrol Tony - super unleaded, preferably BP Ultimate, if not Shell V-Power as a (sort of) passable second.
Also check your wiring to the knock sensor as they tend to be tough little animals and don't fail often. You can check continuity with your DMM, can't remember the figures and they're usually pizeoelectric devices so the continuity will be different to the usual electromagnetic sensors such as ABS, wheel speed, timing and so on.
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Would that not be less likely to generate a knock signal?
We don't know how it decides to generate the code. As you say a piezo crystal is hard to test with resistance. Maybe you could put a pulse in and look for a slighly delayed one back. Maybe you can feel or hear it in test mode, but its normally an input, it would need a strong output to do that so I doubt it. Maybe there is a low level noise signal from the engine running.
I have experienced it working with 95 and 12psi boost, you get a big flat spot.
In any case it hasn't come on again.