i recently got my ls/vtec into my 91dx, did the whole mpfi business as per the good instructions by fourthgenhatch. anyway, i've been having issues with it running right, and i'm looking for some help.
when i first start the car it fires up nice, revs to about 2000rpm, then the revs drop and it dies. i can keep it going if i give it a bit of gas, but it also bogs at the first bit of throttle, then revs up when i let off. i've checked all the tps, white wire business and thats all fine.

what i have discovered though is that if i pinch the fuel return line, my idle rises up nice, and i have way better throttle response, almost no bog at all. what would you guys think.... reg gone bad or stock dx pump giving up? the fuel filter is new, inj work, proper resistance, i can hear the pump prime up etc...

i do have a chipped(mugen) pr3 ecu, it seems to run very rich at first, it dumps lots of fuel at startup, but has lots of trouble with hesitation and bogging, and the a/f meter goes to lean after a while of running.

 

bump

 

going through same deal

and i wish i could figure it out

hopefully u and I can get a plan where to begin

 

give me some more info about your trouble?

 

Definitely need a little more info in order to help.

Speedave,

Sound like possible fuel pressure regulator, but have you installed fuel pressure guage on it to see what fuel pressure is?

Also, sure you don't have MAP and TPS connectors swapped?

 

well i just came from chinatown showoff

and well i floored it and it boggs and if i slowly press down car rpm's goes up
but as i said as soon as i mashed it the cars boggs or smoke goes out like a fuel cutt

 

sounds like your A/F ratio is off. Try putting a fuel pressure gauage on and a regulator. Bet your running richer then you think.

 

do have these
all Aem expect the gauges
autometer and liquid filled in the fuel rail

and i am at 45 psi

i just don't think that is it...