so i just got back from the state ref and my results were good, besides a high level of HC an CO, which is a rich mixture( not burning all the fuel)
all thats left on my car that isnt stock is the Walbro 255 fuel pump and 2.5 exhaust with a cat. he said it wasnt an exhaust problem though, anyone?

 

maybe your fuel pump is too much for stock injectors. is your car built or stock? if you have a stock car that fuel pump should not be necessary. could be a possible o2 sensor going bad. do you have a cel?

 

no cel, occasional speed sensor, but i know whats wrong with that....um i thought if the fuel pressure regulator was stock itll pump stock fuel. my cars all stock i just gotta pass ref and build it up hahaha, again. i think it might be the o2 sensor im gonna get it diagnostic tommorow though the guy at the ref said its close to stock it probley needs to be tweaked cus theres tomush fuel and not enough air....but my spark pugs look a little on the lean side, o2 sensor?

 

I'd agree that the pump is too much. The guys at RC Engineering told me that a stock pump should be plenty for a B series swap. I had the exact same issue in my eg. Plugs look a little on the lean side, bogged down some, and ran like complete **** until i swapped the pump back to stock. The pump should be good enough, as well as injectors, for most of the bolt-ons to be installed. I'm running a civic si pump with a b18b1, stock injectors, header, exhaust, skunk2 im, skunk2 tb, msd ignition, etc.

 

yes!! it was just the o2 sensor fuel pump doesn t do anything with outh an upgraded fuel pressure regulator

 

good info