Short background:

OBD0 90 crx Si w/a b18c swap.

Sparks all cylinders. All cylinders have fuel EXCEPT #1. Swapped injectors and cylinder 1 still isn't getting fuel.

Tried 2 different ecu's with the same result.

2 wires on the ecu aren't pinned to the ecu harness. Pic below. They looked to be out of the middle (B) plug. I have checked a few pinout charts with no luck.



Any help would be greatly appreciated.

 

Anybody?

 

what computer are you running?
on stock odb0 crx harness those wires are
white/yellow (b5)- alt. rf signal
green/red (b19) - eld unit imput

all the injectors and fuel control should be in the a plug.
i would test the number 1 plug and see if any power is getting to it when it should be.

i dont know if this link will work but its the plugs for the ecu
http://ondemand5.com/mric/comm..._BW=0&


Modified by GroundZer0 336 at 6:38 PM 10/4/2008

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GroundZer0 336 &raquo;</TD></TR><TR><TD CLASS="quote">what computer are you running?
on stock odb0 crx harness those wires are
white/yellow (b5)- alt. rf signal
green/red (b19) - eld unit imput

all the injectors and fuel control should be in the a plug.
i would test the number 1 plug and see if any power is getting to it when it should be.

i dont know if this link will work but its the plugs for the ecu
http://ondemand5.com/mric/comm..._BW=0&


Modified by GroundZer0 336 at 6:38 PM 10/4/2008</TD></TR></TABLE>

Thanks.

I have swapped ecu's. First one was a jdm pr3 for a b16. I forget what the 2nd one was, but regardless of the ecu I used, neither ecu provided fuel to cyl 1.

I thought the ecu powered the injectos ? How would I check power there?

Pull the clip and put a volt meter ? The car won't run @ all.

It should @ least fire on 3 cylinders..

 

Ohm out the wires from the ECU to the injectors and ensure that there is continuity, A1, A3, A5 and A7 are cylinder 1 2 3 and 4. (That's the top right most wires going into the ECU on the white plug in your picture) then check the other side of the injectors to be sure that there is continuity with the injector resistor box. When wiring is unknown, I usually suspect it first...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IndySporty &raquo;</TD></TR><TR><TD CLASS="quote">Ohm out the wires from the ECU to the injectors and ensure that there is continuity, A1, A3, A5 and A7 are cylinder 1 2 3 and 4. (That's the top right most wires going into the ECU on the white plug in your picture) then check the other side of the injectors to be sure that there is continuity with the injector resistor box. When wiring is unknown, I usually suspect it first...</TD></TR></TABLE>

Thats what I thought, but I didn't have a piece of wire handy at the time to extend my probes.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GroundZer0 336 &raquo;</TD></TR><TR><TD CLASS="quote">what computer are you running?
on stock odb0 crx harness those wires are
white/yellow (b5)- alt. rf signal
green/red (b19) - eld unit imput
</TD></TR></TABLE>

What do they do?

 

Bump.

 

More bumpage.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ExVtec &raquo;</TD></TR><TR><TD CLASS="quote">

Thats what I thought, but I didn't have a piece of wire handy at the time to extend my probes.


</TD></TR></TABLE>
Yeah dude I have my positive lead on my Ohmmeter extended long enough to reach to the back of my car from the front lol, I do stuff like that all the time with wiring.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IndySporty &raquo;</TD></TR><TR><TD CLASS="quote">
Yeah dude I have my positive lead on my Ohmmeter extended long enough to reach to the back of my car from the front lol, I do stuff like that all the time with wiring.</TD></TR></TABLE>

I grabbed some extra wire, I am gonna try it out.

 

Have you tried to probe the injector to see if its getting +/- from the ECU?

How do you know its not getting fuel to cyl 1?