just redid the wirring on my racecar. OBD1 p28 RC450 injectors.
Stock honda ecu currently with crome.

I'm not getting any fuel from the injectors. car starts on starter fluid but no fuel from injectors. meassured 12 volts at injectors. when I ground them individualy they fire fine. But the ECU is not firing them. car was running fine before.

checked and redid all ground points.

Help get this bad boy started to get to the dyno.!


Modified by DOHCtor Boost at 10:06 PM 6/29/2007

 

hmm, do you have any pictures of the wiring you could post?

 

No....but would that help with anything? I'll try to take a pic. Nothing special just a basic race harnes..! I made a couple of them already.

 

I just find it easier to look at things

 

what injectors? Are you using a resistor box?

 

if ur useing a risistor box, recheck the 5th wire

 

Is the fuel pump working?

If it's not working the ecu has a bad ground.

 

if you are using the 450cc injectors, with the stock ECU on chrome, you are most likely getting flooded with fuel.
Are you sure there is no signal on the injectors??

you can't run 450cc injectors on the stock ECU program. you should check and make sure what program you have on there and make the proper adjustments

good luck

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by evilhatch2.0 &raquo;</TD></TR><TR><TD CLASS="quote">if you are using the 450cc injectors, with the stock ECU on chrome, you are most likely getting flooded with fuel.
Are you sure there is no signal on the injectors??

you can't run 450cc injectors on the stock ECU program. you should check and make sure what program you have on there and make the proper adjustments

good luck </TD></TR></TABLE>

Not stock program car was running fine on the same tune..!

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1992Si &raquo;</TD></TR><TR><TD CLASS="quote">Is the fuel pump working?

If it's not working the ecu has a bad ground.</TD></TR></TABLE>

Fuel pump is working, again this is not the first wiring I have done.

The injectors are out of the intake manifold I have them setup so I can see them squirt fuel. But no squirt whatsoever.

Injectors are getting 12volts. Checked resistor box 12volts fine.

This is realy weird.

Any more ideas?

 

if the rail is off the im and you are expecting the injectors to squirt then good luck. If you have fuel pressure then the injectors should get blown out of the rail.

 

Your getting 12volts out of your resister box? Isnt it suppost to be 4 wires to the injectors from the ECU, the other 4 wires on the injectors go to the resister box which should be grounded. Its been awhile since i've done this

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DOHCtor Boost &raquo;</TD></TR><TR><TD CLASS="quote">just redid the wirring on my racecar. OBD1 p28 RC450 injectors.
Stock honda ecu currently with crome.

I'm not getting any fuel from the injectors. car starts on starter fluid but no fuel from injectors. meassured 12 volts at injectors. when I ground them individualy they fire fine. But the ECU is not firing them. car was running fine before.

checked and redid all ground points.

Help get this bad boy started to get to the dyno.!Modified by DOHCtor Boost at 10:06 PM 6/29/2007</TD></TR></TABLE>

i ran into this problem before............
it was a crx that a customer swap in a obd1 dash harness and engine bay harness..
so the crx was runing on obd1

theres spark
spray carb clean and car with start
everything works computer just won t send pulse width!
fuel pump works
injectors have power
all 4 wire from the ecu to injector ( injector signal are fine not shorted or open)
i never got to find the problem
the customer wanted to swap back to obd0 because it was a headach..........

what was the last thing u did?


Modified by DOHCtor Boost at 10:06 PM 6/29/2007[/QUOTE]

 

Are you sure you've pinned them right to the ECU? I can't tell you how many times I've gotten those stupid connectors flipped and/or backwards.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SpeedDreamz.com &raquo;</TD></TR><TR><TD CLASS="quote">if the rail is off the im and you are expecting the injectors to squirt then good luck. If you have fuel pressure then the injectors should get blown out of the rail.</TD></TR></TABLE>

the ge fuel rail is holding them snug. I can prime the fuel pump without them blowing of. My fp gauge shows 45psi across the fuel rail.


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SovXietday &raquo;</TD></TR><TR><TD CLASS="quote">Are you sure you've pinned them right to the ECU? I can't tell you how many times I've gotten those stupid connectors flipped and/or backwards. </TD></TR></TABLE>

checked the order today again. by grounding each wire and seeing wich one squirts.


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

i ran into this problem before............
it was a crx that a customer swap in a obd1 dash harness and engine bay harness..
so the crx was runing on obd1

theres spark
spray carb clean and car with start
everything works computer just won t send pulse width!
fuel pump works
injectors have power
all 4 wire from the ecu to injector ( injector signal are fine not shorted or open)
i never got to find the problem
the customer wanted to swap back to obd0 because it was a headach..........

what was the last thing u did?</TD></TR></TABLE>

Car was running on a OBD0 to OBD1 jumper harnes. I decidet to redu the entire harnes and make it OBD1. Its an OBD0 motors swap.

I see more poeple have run into this problem and all are obd0 swaps.

Bump for more info.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SlowReaction &raquo;</TD></TR><TR><TD CLASS="quote">Your getting 12volts out of your resister box? Isnt it suppost to be 4 wires to the injectors from the ECU, the other 4 wires on the injectors go to the resister box which should be grounded. Its been awhile since i've done this</TD></TR></TABLE>

this is wrong, you should have a 12 powr source go to the resistor box, then all the "powers" for the injectors will come off the resistor box, each "ground" from the injector will go to its own pin location on the ecu.


to the OP. what did you do with the wires at pin locations..

A11-Ignition power 1
A23-Power ground 1
A24- Power ground 2
A25- Ignition power 2
A26- Logic ground 1

B1-Igntion power 2
B2- logic ground 2

D1- voltage backup

 

Always thought that the dead end connector was a ground didnt know it was 12v. I would always depin the injector wires from the dead end plug, then into the resistor box.Then the last wire from the resistor back to the dead end plugs. Good thing I never grounded it haha. Thanks

 

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

this is wrong, you should have a 12 powr source go to the resistor box, then all the "powers" for the injectors will come off the resistor box, each "ground" from the injector will go to its own pin location on the ecu.


to the OP. what did you do with the wires at pin locations..

A11-Ignition power 1
A23-Power ground 1
A24- Power ground 2
A25- Ignition power 2
A26- Logic ground 1

B1-Igntion power 2
B2- logic ground 2

D1- voltage backup</TD></TR></TABLE>

A11-Ignition power 1 --&gt; empty pin I don't have this on my ecu plug, and I don't see it in my pinout diagram either.
A23-Power ground 1 --&gt; ground point on thermostaat housing (G101) + pin 2 on obd0 main relay
A24- Power ground 2 --&gt; ground point on thermostaat housing (G101) + pin 2 on obd0 main relay

A25- Ignition power 2 --&gt; Pin 3 on OBD0 Main relay (This is ignition power 1!)
A26- Logic ground 1 --&gt; ground point on thermostaat housing (G101)

B1-Igntion power 2 --&gt; Pin 3 on OBD0 Main relay
B2- logic ground 2 --&gt; ground point on thermostaat housing (G101)

D1- voltage backup --&gt; Constant 12volt from battery

 

what about pin b9 -start sig ?
and A7-

on obd1 relay (i thought should match from, non-obd to obd2)


igp1 +igp2 (a25 +b1) go to pin 6 on relay
start sig (b9) go to pin 2 on relay
a7-flr1 go to pin 1 on relay
pg1 + pg 2(a23 + a24) go to pin 3 on relay, + thermoground 101

 

the pinout of the obd0 relay is different than the OBD1 diagram I have. Can anyone confirm this??

B9 is start signal. I T-ed in the wire at the starter selonoid one wire going to the ecu and another goint to the MAIN RELAY.

 

Here is the OBD0 main relay and pinout.

 

Up for more help...!

 

does the car still have a key on it ? or just a switch and a push button start ?

you can "prime" it and get 45 psi @ the rail ? which means the main relay should be doing its job ?

also, are you sure those rc's need the resistor box to run ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dturbocivic &raquo;</TD></TR><TR><TD CLASS="quote">does the car still have a key on it ? or just a switch and a push button start ?

you can "prime" it and get 45 psi @ the rail ? which means the main relay should be doing its job ?

also, are you sure those rc's need the resistor box to run ? </TD></TR></TABLE>

yes car still has key in it. yes the fuel pump is primming. 45psi @ the rail. ecu working no cel. Yes the RC's are low impedance injectors. about 2.9 OHMS to be exact.

Anyone think other inputs are faulty causing the ecu not to fire the injectors.


Modified by DOHCtor Boost at 5:35 PM 7/1/2007

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DOHCtor Boost &raquo;</TD></TR><TR><TD CLASS="quote">
Anyone think other inputs are faulty causing the ecu not to fire the injectors.
</TD></TR></TABLE>


possible that you have a wire or 2 switch at the distributor ? how well does the car run with starting fluid ? barely ?

 

Are you refering to sparkplug wires? checked them already. Checked the CYP TDC CKP wires to.