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Knock sensor retarding timing

Tiny
WILL GIBSON
  • MEMBER
  • PONTIAC GRAND PRIX
My '96 Pontiac Grand Prix with 147K on 3.1 V6's knock sensor has taken to retard the timing to 0 and less. It only does it after it has been driven for about 15 minutes or so. Then, as you excellerate up to say 50, at about 2,000 rpm it quits excellerating, untill it finally downshifts, and then it runs great. Once you level off, if you try to accelerate, nothing happens untill it downshifts again. Once it gets over 3,000 rpm, it'll run fine. But who can cruise at 100?
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Thursday, February 15th, 2007 AT 2:39 PM

3 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Any check engine light? If so lets get it scanned and go from there
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Friday, February 16th, 2007 AT 7:49 AM
Tiny
WILL GIBSON
  • MEMBER
  • 3 POSTS
No check engine or SES ever came on.
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Friday, February 16th, 2007 AT 1:36 PM
Tiny
WILL GIBSON
  • MEMBER
  • 3 POSTS
Scan was uneventfull untill under a light load at 2K, and then the timing started retarding to zero if you kept your foot in in.
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Friday, February 16th, 2007 AT 1:38 PM

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