please help with my ka-t

[Riubens]

ok guys ive been turbo for for 2 years and really never had any problems ,,,,,,but today i got a dam problem with this car and i cant figure it out.any time i step on the car over 20% it bogs really hard almost about to die and backfires and wont go in to boost even when am at idle it does the same thing i step on the throttle just a tad and its fine bit i sted on it bogs like its going to shut off.i just upgraded to 525cc injectors the day before and tuned the car with the wideband and the car ran perfect for the whole day,and all the sudden today when i hit boost this happens,i already did alot of stuff to see if i pinpoint the problem with no luck,,i replace the maf wit another n62 and still same $hit,i even put my stock maf back and no luck,hell i put my old 370cc injectors back and nothing,i replaced my sparkplugs and wires,checked my timing,and even replaced my ecu .

i put a vid just to give you guys an idea.http://www.youtube.com/watch?v=RYJCGchoisg

please help!

[del82]

Acts like a MAF problem, but I also hear spark knock in there, so it may be leaning out...not really enough info to help ya, other'n to tell you to take it to a tech. Is it OBD I or II?

[the converted]

Did you check for a boost leak? That's what it sounds like to me.

[UncleBen]

MAFS or distributor. My ka-t setup did this exact thing and it was the distributor.

[Riubens]

ok, so today i checked to see if it was a bad ground and relocated my battery to the front again and added one more ground to the engine and chassis and no luck,then i decided to look for codes in the ecu,at first code 21(ignition signal) and code 34(knock sensor)came up. so i disconnected the knocklite off the ecu and cleaned my sparkplugs which looked super black like it was running rich but my wideband said otherwise??after all that still same problem ,so once again i wanted to see if i still got the same codes after the changes,but this time only code 34(knock sensor) came up?so could my knock sensor cause this issue ? because ive had my KS plug come loose before and all that would happen is the timing would go insane! my afr's are 14-15's so right on point i also checked the TPS signal in the S-afc and everything looks good.tomorow i will change the distributor to see if that helps.

please help !

[del82]

Sounding more and more like a distributor issue, your knock *sensor* is fine, it REALLY IS knocking, and quite badly. That's that clattering noise when its trying to stall that sounds like you got a bunch of marbles in your engine.

And, since its knocking, don't keep driving it around like that, you'll end up damaging your rings and possibly pistons as well.

[kpariaug]

tps???

[Jus14]

Also sounds like IC piping could have busted a boot or come loose somewhere....