Lately i've been getting odd knock retard reading on my interceptor. The readings seem to vary in intensity ranging from 2-as high as 30 which is leading me to think its getting a false reading. It seems to jump around more when starting out slowly or when in reverse. Does this seem to be false knock being caused by poor mounts or could this be due to a cracked piston? I pulled and changed plugs yesterday and they all appear fine i put new ones in and same issue. I'm not getting any engine codes either.

 

do you have an aftermarket exhaust?

 

i have the gm cat back since new problem just recently started. I've got ottp stage 2 mounts with 25k miles and i'm thinking they may have just worn out?

 

I'm not sure...I've read somewhere about aftermarket exhausts banging on the frame and people getting false knock readings

 

ya i've been searching and lots point to motor mounts my exhaust isn't hitting anything. I think i'll just switch back to my old poly mounts this week to see if it is the mounts. Just looking for other places to look to just incase its not them

 

I gotcha man. Just let us know what it is. I was reading on my Dad's Turbo Buick forum about false knock. And the sense is designed to "listen" for a specific frequency of sound and thats "knock." The guy posted a list of things that have roughly the same tone/frequency most of them where exhaust things.

 

ya it really bugging me cutting timing and power all the time. Compression is good and so are the mounts search continues