Accesport keeps coming up with all cylinders misfiring, what to do?

 2002 Wrx

Mods:

IHI VF30 19psi

STI 550cc inj

APS cold air w/K&N filter

Samco MAF hose

Perrin turbo inlet hose

APS Front mount intercooler

Walbro 255lph fuel pump

PDE catless downpipe, uppipe and highflow cat

step colder plugs

Edited May 25, 201312 yr by smr6879

What codes?

step the plugs back up and see what happens.

Has the car been tuned professionally on a dyno?  I assume you have it on a basic stage 1 map?  19 PSI is awfully high if you haven't had a dyno tune done.  Do you have an AF gauge so you know where you are in the stoichometric level?  14:1 goal and I bet you are real rich with those mods and have fouled plugs.

P0301,P0302,P0303,P0304 are the codes im getting, the previous owner said it was tuned by P&L motorsport in IL

My initial thought is fouled plugs because of the colder heat range, WRX runs cold plugs anyway, I don't see any need to have them even colder. Try a set of stock plugs first.

 

Second thought is the MAF sensor could be covered in oil from that K&N.

i got the codes to go away by changing the map, my 02 wrx over revs when boosting after i went to the drags. Would that be my clutch? Stage 1 exedy, previous owner says he had it put in at 80k now has 125k

I've seen lightened flywheels on the '02 and '03 WRXs cause misfire codes.