GMC Repair: knock sensor, pontiac grand prix, knock sensor

Question
where are the knock sensors locate because i was told that i have 2 on my 99 Pontiac grand prix

Answer
the Knock sensor is located just under the manifold back next to the fire wall you can see it from the bottom. It's hard to get to if you have small hands you can touch it from the bottom. However it is much easier to let the eng. cool down lean over the eng. close to the front of the eng. if you can get your hand and arm back there it is much easier to remove and replace from that point. I know I did one from the bottom it took 1.5 hours from the top it less than 15 minutes.

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