spoonef

My d15b stock header was pretty short and would not reach my stock cx piping.So my mechanic says we should put on my cx header so that i have a cat.So now im driving and i can hear some backfiring just a bit.Would that be because of my exhaust setup or the p28 getting used to the motor?.

Im also getting a code 21(vtec spool solenoid) so i took off the solenoid and cleaned it out and went for a little test.I didnt notice anything so im not sure if the solenoid is not working or if my ecu is bad.Whats the vtec crossover on the p28?.The light is constant and people say that it must be the ecu cuz the light should ony come on when im in the vtec range.

Street Ghost

I think the crossover is 4800rpm. Check your connections to the VTEC solenoid. If it's on constantly, it might be a connection problem. Did you reset the ECU after you cleaned it?

spoonef

I did not how would i go about doing this?

Street Ghost

Pull the backup fuse for about 15 seconds or so. I think disconnecting the battery also does the same thing.

jdmsiR20

what harness are you using? are the three wires for vtec connected to the shock tower/ecu?

header should mate up perfectly to the cx exhaust also

spoonef

Im using the cx harness and the exhaust bolted up but that backfiring is there and i dont kno why

spoonef

Bump for me

jdmsiR20

check firing order... replace to new spark plugs, spark plugs wires, wire up vtec, run 4wire o2

GdmLaz

if your using the cx harness how do you have the vtec runned since the cx is not a VTEC wiring harness and another thing if you have a check engine light on the vtec is not going to turn on

2fast4u831

I'd say you hook up your vtec. Need help let me know,Surge

spoonef

Firing order is right i also have brand new oem plugs and wires