fuel issues

[gstryda]

i have a 95 eclipse gst with 84000 miles on it. ive added an intake, down pipe and exhaust. i have this issue where excessive fuel is fowling out two of my four plugs causing serious misfire! what would be the cause? oh i also have a evo 3 16g turbo installed also

[eighty9crx]

Do you have upgraded injectors and an ecu?

[gstryda]

no. not at this time

[gstryda]

i didnt think that would throw things off that much. it does it even when idleing for a while too

[eighty9crx]

Are you getting a check engine light?

[gstryda]

multiple cylinder misfire

[eighty9crx]

You might want to do a fuel pressure test on the car and see what that reads.

[Ax]

Are you sure you're getting too much fuel? Or not enough? Because if you're getting a misfire code, it's most likely because you're too lean. You can't just slap on a 16G and call it good. You're getting a lot more air with the bigger turbo, and your stock injectors can only support about 16psi. Get a boost controller, boost gauge and an A/F Ratio gauge. Turn boost down to 15-16 pounds and see what that does. I would also recommend getting some oversized injectors, and possibly a larger fuel pump. Like I said, you're only going to get as much power as your fuel flow allows. If, and when you do upgrade the fuel system, be sure to buy an SAFC tuner as well...