Need help with knock

[86SS86LS]

I'm trying to diagnose a knock problem. Stock turbo, 30 lb injectors, SMC methanol kit and a new TT chip. WOT O2 readings are 775 and EGT's are around 1200. At 18 psi, I am seeing up to 4 degrees of knock. I am running 91 octane and I just installed the RJC power plate but it did not seem to help. I shouldn't be seeing any knock at 18 psi with methanol injection. Where should I start...could it be false knock?

 

[John Wilde]

Are you sure that your timing is correct?
A bad crank sensor can give you a lot of issues.

 

[86SS86LS]

How do I know if the crank sensor is not functioning correctly?