jhota

car is a 1990 Civic wagon 2wd. did DPFI->MPFI swap. used effin guide for swap. all connections soldered and shrink-wrapped.

car cranks but won't start. car is not throwing codes at this time. was throwing a 4 due to bad connection in "b" plug.

when ignition is turned off after cranking, oil pressure and the light next to it (door open? hatch open? i can't remember) are dimly lit. the seatbelt light is very dimly lit - can barely see it. and the ecu blinks randomly. this continues until one of three things happens: 1. disconnect battery. lights and ecu stay off after reconnect. 2. unplug main relay. they stay off after reconnect. 3. randomly turn off on their own.

with key on, have no power out from main relay to injectors or fuel pump. main relay is new - as in, replaced it and the problem persisted.

fuse 14 has continuity and power. fuse 37 has continuity and power.

to check wiring harness to main relay, manual states that yellow/black wire going into main relay should have power with the ignition off. mine does not. fuse 14, which supposedly powers the blk/yel input, appears to be switched. this is according to the wiring diagrams i have and empirical testing.

turning ignition to "on," hear the characteristic "click-click" from the main relay. again, no power to fuel pump or injectors. or out from relay.

relay has continuity to ground through black wire and to ecu pins A12/A14 through blk/grn wire. ecu has continuity to ground through both A2 and A4.

ELD checks good.

two different (one known good) ecus have been tried, no change in symptoms.

main relay has been replaced.

fuse box has been dissasembled and cleaned.

ignition switch has been resoldered, dissasembled and cleaned.

has anybody got any ideas? or should i just splice in a switch and relay to supply power to the fuel system? or will this even work? i'm bloody stumped at this point.

also, car ran fine before swap, other than occasional refusals to crank. when bypassed at starter signal connector, always started.

Rukusmasta2

check ur grounds

jhota

ok, which grounds?

ecu grounds are ok, main relay ground is ok, fuel pump ground is ok, ELD ground is ok. what other grounds are we talking about?

jlicrx

ground wires coming out of engine harness (wires have a small ring type end on them) that connect to the thermostat housing - these are grounds for the ECU and most of the sensors

Rukusmasta2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jlicrx &raquo;</TD></TR><TR><TD CLASS="quote">ground wires coming out of engine harness (wires have a small ring type end on them) that connect to the thermostat housing - these are grounds for the ECU and most of the sensors</TD></TR></TABLE>

slpnz6

very common for people to miss that one... def. check it out man, then when you fix it... you can kick yourself in the *** for missing it.. like everyone else who has in the past.... hahaha good luck bro..

jhota

thermostat housing ground is fine. already cleaned and checked it. any other ideas?

edit: damn, i can't spell.


Modified by jhota at 8:56 PM 9/14/2006

LigerZeroWPC

theres also the tranny ground, motor ground.
r u sure wired up right? check all your sensors etc. if not try switching the 2 peach colored wires in your dizzy plug.

jhota

i've checked and re-checked the wiring.

i don't have any peach wires - am i missing something?

i'm getting spark, btw.

any other ideas? anybody?

what really bothers me is that there is obviously either something staying on that shouldn't, or a short at a relay somewhere. (as evidenced by the ecu and dash lights getting random power after key off).

in that vein, since i've replaced the main relay and bypassed the fuel injection relay, where the heck did they hide the starter relay? i can always pull that out and test it too.