KNOCK UNIT

1997 Pontiac Grand Am

Tiny

Debby1964

August, 7, 2009 AT 3:58 PM

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

FOUND 1772 RELATED QUESTIONS

1 Answer

Tiny

mmprince4000

August, 9, 2009 AT 8:57 AM

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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