1997 Pontiac Grand Am Knock Unit

Tiny
DEBBY1964
  • 1997 PONTIAC GRAND AM

Engine Mechanical problem
1997 Pontiac Grand Am 6 cyl Front Wheel Drive Automatic 73246 miles

What is the purpose of a knock unit and what does it do does it pertain to the oil

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Friday, August 7th, 2009 AT 3:58 PM

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Tiny
MMPRINCE4000
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If you are talking about a knock sensor? It screws into a water jacket and like a microphone listens for any pinging or pre-ignition. If it detects is it will tell PCM to retard timing anywhere from 1-15 degrees, to prevent damage to engine.

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Sunday, August 9th, 2009 AT 8:57 AM

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