First time post and in need of some help.
I have a 90 Accord automatic. I just changed out the motor with one out of a 92.

My problem is it won`t start. It has spark and fuel pressure. Code 16 shows up while scanning...indicating Fuel injectors.

I`ve changed them out but still no start.

If I squirt some gas directly into the plenum it fires up instantly then promptly dies.
Seems like the injectors aren`t getting a signal.

Without a NOID light how can I trouble shoot this problem and is there a way to patch in a jumper to get voltage directly to the injectors ??

Any help would greatly appreciated..thanks

noid light sets are like 15-20 bux at the parts store. buy it.....test for power real quick...then return when finished if you don't want to keep them. i'd check the injector resistor as well.

I changed out the resistor, no change.
Any idea how to supply voltage directly to the injectors?

I`ll try to get a noid light in the mean time.
Thanks

try resoldering your main relay. the solder point from main relay to ecu may be cracked....in turn it may not be sending a signal to the ecu for the injectors to turn on. assuming there still no power to the injectors.

If I`m getting fuel pressure would that tell me that the main relay is good?
I`ll have a look at it thanks

Yeah, buy a $10 noid light or a voltometer or whatever they are called. I am in the midst of fixing an injector problem, and I'd be completly lost if I couldn't check for voltage and resistance.

Any idea how to supply voltage directly to the injectors?
Forget that - you can't "hot wire" injectors.

Forget that - you can't "hot wire" injectors.

What would you say is the problem when, as stated I give it a few shots of gas and it fires right up?

Forget that - you can't "hot wire" injectors.

What would you say the problem is when, as stated I give it a few shots of gas and it fires right up?

Can you give a couple of possibilities?
Thanks

Sorry about the 2x post.

Did a NOID test... NO PULSE!

Does it matter that I haven`t put the radiator and fan assembly in yet?

Now I know the injectors are not getting a signal, now what?

Start working your way down the wiring back to the ECU. Also see if you can find a wiring diagram for the main harness/ECU for your specific car. (possibly in a haynes or chiltons manual?)
Once you have that, you can check intermittantly back to the source, until you can find where you are losing the flow of electricity.
That is where I'd start.

So you are saying none of the injectors are getting a pulse...that would lead me to believe it is closer to the ECU, rather than an intermittant wiring problem somewhere in your engine bay.

As far as what you said about giving it a few shots of gas...if I understand correctly,
Why wouldn't it die...it doesn't have the fuel coming from the injectors to sustain it running...just because it starts...it still needs more fuel to keep going.

I checked voltage at the fuel injector connections... #1 and #4 have voltage the other 2 nothing.
Also when leaving the key on the run postion to check for voltage the injector resistor box gets too hot to touch is that normal?

I have to say it`s about impossible for me to check wiring when it`s in a tightly wrapped harness that ducks back under the motor.

Any ideas why two injector leads would have 12V (# 1 #4 ) and the other two have 0 V ??

What happens when you have the engine off, but the key in the 'ON' position, all four should show zero volts if I'm not mistaken.

I know how impossible it is to try to trace the wires wrapped in heat tape. That is why I suggested finding wiring diagrams for where the wires go, where in teh main harness they are, and which pins on the ECU, etc.


I wish I knew more about this, unfortunantly, it is a problem I'm struggling with as well (just the opposite though, I have 1 injector grounding out)
As far as why 2 aren't getting 12V, it is possible they aren't getting grounded properly.

Guy`s I found the problem...I had the wrong plug lead going into the resistor.
I can`t stand myself right now but i`ll get over it...I think.

Anyway thanks for your help.

Glad you found the problem.