Quote:
Originally Posted by ischmitz
The American word tachometer refers to the rev. counter (engine speed). You seem to indicate that your speedometer drops by some value 5 - 7 km) when the noise occours, correct?
-->CORRECT!
Thinking out of the box could the periodic noise be your AC-compressor kicking in with a bad bearing or similar. Maybe that in combination with some poor GND causes your board voltage to change. The compressor uses a magnetic clutch that can either be bad (drawing too much current) or simply bog down the board voltage due to issues elsewhere......
--->I don't have AC in my car.
But then agian it is really difficult to diagnose something remotely. A good mechanic familir with 911 should be able to narrow things down pretty quick especially when you can provide solid observations of what happens.
Good luck,
Ingo
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Thanks Ingo, The mechanic that drove it, said he hasn't seen this before and could not give me a diagnosis on the spot...