Phantom knock problem solved...?

[L98guy]

Ok, for the like the last 2 years I've been trying to get rid of a terrible phantom knock issue on my 93 GSX. I was always getting like 30-43 counts of knock at anything above a light throttle under load. I tried everything mentioned on this board to get rid of the phantom knock but nothing worked. It seems as though I've stumbled across the problem. It seems that the knock sensor was picking up a false knock from my ext. dumped O2 eliminator downpipe. I've got a 50 trim that has the divider cut out of the exhaust housing so exhaust was always coming out the ext. dump at light throttle and causing this false knock. I rigged up a plate over the external dump tube and took the car for a drive. To my surprize I would get no knock at light throttle and only like 2-3 counts at moderate throttle which is probably actually real knock. Anybody ever heard of someone else experiencing something like this?

 

['92-RiceEater]

I was getting BAD phantom knock from my stock lifters about 3 weeks ago, got some revised lifters and it fixed the problem, went to the track, ran great (no knock on any of my runs). Then the next day i go to take the car out and i'm getting maxed out knock readings anything over 10-15% throttle, in or out of boost. I finally came to the idea after replacing the knock sensor and swapping computers that it could be my exhaust. I had a 3" done about a week before the lifter install. I was thinkin, man it keeps knockin at the same rpm point every time but it just finally dawned on me that it could be the exhaust because there is nothing but pipe and a flex sec. So Mon. i'm goin to go back up the the muffler shop and get them to weld in a resonator, or 2 to see if that will quiet it down and solve the problem. I hope it does, but the only think that kind of confused me was why would it not knock one day then all of a sudden out of the blue just like max out the sensor.