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Re: Testing Knock Sensors

>> you also should be able to watch the flywheel with a timing light, as
>> your talented assistant taps the block (or the sensor - but with
>> something light like a thin screwdriver - very lightly!), you will see
>> the timing get retarded as the ECU "hears" the knocks you are making and
>> takes corrective measures.

> Probably won't work.  The ECU knock code only takes effect
> over 0.7 bar manifold pressure.

Also the timing light is usually driven by only one of the cylinders,
and retardation is applied on a cylinder-by-cylinder basis.

 Phil Payne
 UK Audi quattro Owners Club
 Phone +44 7785 302803  Fax +44 870 0883933