hey gang
any help would be appreciated on this topic.
my 97 wrx is hesitating under WOT.
ive changed the spark plugs and 2 coilpacks, fuel filter ,oil and filter.
my *** import wrx has lightened flywheel ,apexi super intake
and recently a new powerflow exhaust from cat back
now this hesitation is only noticeable when the car has fully heated up.its like loss of power for a sec then normal then hesitation.i get no CEL. have connected the black plastic connectors under steering CEL flashes constantly (no error codes)
same when i reset the ecu normal flashing,but the car drives ok after a reset but then the hesitation comes back after a day or so.
how can i tell if this is my MAF or the new powerflow exhaust.
does a standard wrx import have 2 silencers (including the backbox) cos the new powerflow replaced 2 silencers one just after the turbo. cos i thought they may have replaced my cat .
any hints
cheers

 

i have a USDM WRX 03MY, and i get a hestitation in 2nd gear only about 2700-3200 RPM. I haven't had a CEL and this started occurring a couple weeks ago. I know i'm not answering your question, but I just wanted to throw in my "problem" (if it is one) in case someone else knows the answer

 

thanx for the replies anyway
this is the thing it has really been happening since the plugs were changed but a mechanic from subaru changed them
and he said they were the proper ones--cost 75 euros too
they are NGK LASER PLATINUM PREMIUM (stock number PFR6B-11)
are these the culprit?????

thanx again lads

 

oh and one more thing ive been lucky enough to get an import with the grounding mod already fitted!!so it cant be that

 

and (sorry) the reason i thought it was the new exhaust is cos it backfires some times and when the guy was fitting it he didnt know if it was the cat he was going to remove then he said it wasnt an fitted the exhaust from just after the turbo (sort of just after the 2 front wheels . was that a silencer or is the cat under the car??
thanx