InfernoSoul

Ok, me and my friend took a D15B2 swaped it from DPFI to MPFI. The car is ------ snapy, but we keep getting a code #1. We replace the o2 senor with a brand new one didn't do anything replace it again still nothing same damn code. It takes about 5 or so minutes before the code clicks. When we take off the airfliter which is directly on the TB it sometimes won't trip the code. Sometimes the code doesn't trip till we start driving. The car doesn't seem to lose much power but when you're driving and have your foot on the gas a quarter of the way just cruising it jerks. We sloved that problem by bumbing up the fuel pressure to 60pounds.
The intake manifold we are using is off a 97 Civic HX, we are using 93 Civic DX fuel injectors, along with 91 fuel injector resistor pack. We are using a 91 Civic Si ECU. Another thing is when we turn off the car it loses fuel pressure quick like in about 30-40 minutes it had lost all fuel pressure.

Any help on solving this problem would really help. If you need any other information that i have left out that might help you figure out why it keeps tripping a code #1 ill post as soon as possible. Thanks.

88crxSi

hrmm..

what car is all this crap in/? you have obd0, 1 and 2 items all matched!

the only thing I can think of is that the 92+ cars use a 4-wire o2 sensor and the 88-91 use a 1-wire. The ecu you installed is expecting a 1-wire o2.

but what car is all this in!?!

InfernoSoul

Its a 91 Civic DX Hatch switch over from DPFI to MPFI, were using s 91 Civic SI ECU, 93 DX injectors, 91 Civic SI o2 senor, 91 Civic SI resistor pack, 97 Civic HX intake manifold, A6 cam along with aem adjustable cam gear, fuel pressure regulator, no fuel filter just so you don't say its the fuel filter.

88crxSi

there is NO fuel filter at all!?

are you sure the o2 sensors wire didnt break anywhere.. maybe when you switched the ecu around u popped a wire out?

alwaystootall

93 DX injectors right there is ur problem i tried to use obd2 injectors in my swap and i had the same exacpt problem u have to use non obd injectors u have to get a set of crx or civic si injectors

alwaystootall

1988-'91 Civic Si/CRX Si Peak and Hold 240cc
1992-'95 Civic Si/EX Saturated 240cc

InfernoSoul

Just a quick question we don't have any SI injectors but we will get them if this idea won't work. Would by any chance 88 Prelude SI injectors work?

alwaystootall

will if they are non obd, peak and hold they should, i think they will work but im not for shure. the clips will fit tho

alwaystootall

https://www.homemadeturbo.com/forum/...threadid=11316 i remembered seeing these a while ago just had to dig, this is a damn good deal and he prob. still has them