1997 Pontiac Grand Am Knock Unit

Tiny
DEBBY1964
  • MEMBER
  • 1997 PONTIAC GRAND AM
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 73,246 MILES
What is the purpose of a knock unit and what does it do does it pertain to the oil
Friday, August 7th, 2009 AT 3:58 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
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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