After completing my swap, I found that I am getting extremely **** poor gas mileage (8-10 mpg) and have a huge cloud of USDM smoke coming out the back. I assume that I am running WAY too rich. This is my setup

92 DX hatch w/95 USDM b18c1
Stock fuel pump, regulator, lines
MSD wires and NGK plugs (came with swap, no clue how old they are)
AEM intake
99-00 Si exhaust
GSR cat

I've had one guy tell me that it is probably the ignition (plugs and wires) and all the fuel is just not burning. Anybody have any suggestions on what I can do to fix this problem?

 

btw - No CELs and the 02 is wired in right.

 

Hmmm...

Did you use a new O2 sensor, or the old, original one?
What ECU are you running? Chipped, or stock program?
Did you tune the engine up with new plugs, cap, rotor, wires?

 

Have you checked the plugs and wires? That's something that should be replaced when doing a swap. Go ahead and try throwing in a new fuel filter and the rest of a "scheduled" tune-up.

 

Thanks for the help so far.

Stock OBDI p72 ECU
Plugs/wires/cap/rotor have no been replaced yet
Brand new o2 sensor (had to buy one because my swap didnt come with it)

 

You will get smoke and 8-10 mpg at WOT, slap yourself in the face for me. Notice smoke during VTEC, yeah, that would be the cause...

Reset ECU and do a tune up.

 

sounds like your running rich, happened to me with my si, whats your fuel preasure at???

 

i had sorta same problem, except i had a dd16z6, found out that the wire harness was phucked and injector 2 was constantly spraying.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jazz215 &raquo;</TD></TR><TR><TD CLASS="quote">i had sorta same problem, except i had a dd16z6, found out that the wire harness was phucked and injector 2 was constantly spraying. </TD></TR></TABLE>

did you take a voltmenter to the harness to find that out or did you take it to a professional?