strange bog under WOT

so in first gear the car pulls tough but 2,3,4,5th all feel like im hitting a wall. at idle after coming to a stop the idle fluctuates between 680 and 812 rpms then slowly settles to 750. knock sensor under wot shows 12-16. I've searched everywhere in this forum and couldn't find anything similar. any guidance would be appreciated.

 

[Brunoboy]

replace the knock sensor? and what mods. and how much boost are you running? fuel cut maybe?

 

[3rdstrikedsm]

Boost leak causing "rich knock"?

 

Yeah definitely need to know the mods and specs on what you are running.

 

Is the EGR valve still installed? I'm not sure if this could be your problem given the amount of info posted, but I had a problem getting the engine to rev past 6000 in 3rd and 4th gear. I tried all kinds of different things to fix it until I read on a local DSM forum from a guy that does emissions that a bad EGR valve can cause a loss of high RPM power. I installed the block off plate and now hit 7k without problems.

 

it actually feels slow through the entire power band while in 2-5th gear. and the knock will sometimes reach 30+. wideband showing 10.1 under wot. i have a scanmaster3 but im its my first time have a scanner so im not really sure what im looking for. but for mods i have a evo3 swap with a big 16g turbo(17psi) impalla ss maf, maf translator, fmic, rc 550's, stock crushed bov recirculated, mbc, stock fpr.

 

[SouthCaliVR4]

start by checking your cam timing, one could be off a tooth, then check the base timing, make sure your grounding the timing plug. If you havn't done at least the F/P rewire get that done & you should be looking at upgrading pump & fpr, though it sounds like neither is responisble for your current issue. Check the timing.

 

yea i have a 255 pump. ill check timing, my gun recently broke so i gotta find someone with one.