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-   -   How do you verify knock sensors working? (http://forums.pelicanparts.com/porsche-911-technical-forum/685889-how-do-you-verify-knock-sensors-working.html)

Joe Bob 06-27-2012 09:00 AM
How do you verify knock sensors working?
 
Never really thought about this until recently.....do you have to read the DME with a scanner?

911pcars 06-27-2012 09:37 AM
I have verified this method on other vehicles, but not a Porsche. Should be valid.
  1. Connect a timing light to the engine.
  2. Start engine and increase idle speed sufficiently to observe spark advance
  3. While monitoring the ignition timing, position a large drift punch on a substantial part of the engine block/crankcase (near the knock sensor), then strike with a large steel hammer
  4. Observe the ignition timing retard to confirm knock sensor activity.

Sherwood


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