[CDG]

Thx SpeedKlix, I'm not totally convinced I have a bad O2 or Knock sensor because as you describe, they are close to each other.
And Nemesis, great read on that thread on advancing the timing, and I agree, I do believe advancement of 1 tooth can improve performance, but I'm only suspecting one side, and if I think about it I would suspect a 1 tooth slip in the opposite direction, so by counts on that thread, an 8 degree retard on my left side.

So now is my delemna, since a Knock Sensor is $158CDN up here(from the dealer)
1)Can I easily test to knock sensor to ensure its toast??
2)or should I persue the verification of the timing on the left cam? Belt was changed around either 140 or 160k miles, can't remember but I do have a log of all mainitance. Thx John H.

I'm going to try and search the forum for a test proceedure, or could just do a basic resistance test and compare the 2 knock sensors?