420A 99 Eclipse 420a cyls 3 and 4 injectors don't seem to be firing

[SgtGoldfish]

So cylinder 3 and 4 injectors not giving signal no pulse

car has rough idle idles then quickly shuts off

not crank angle sensor
we did test volt
We swapped injectors
New ecu
All cylinders giving great spark
Its not the fuel pump it works
We tested the wiring its all good
Like i said idk what could be the problem
If anybody has a fuel injector diagram i could see why its not recieving signal

When i got turbo for it ran fine for some reason but i just went stock and now this

 

[Sirius1995]

maybe the new ECU is faulty? you probably got it used? also I would change the injector wiring harness too, you can seperate it from engine harness, if you need one, I have one

 

[dustyboner]

did you check the wires between the ecu and the injectors? have you check the resistance of the injectors? should be around 12 ohms.

if you have voltage on the black/red wires at each injector, the injectors are all reading around 12 ohms and the wires have continuity between each injector and the ecu, it has to be the ecu.

 

[luv2rallye]

May also have a problem with the camshaft position sensor or it's wiring (as it controls injectors).

 

[Sirius1995]

May also have a problem with the camshaft position sensor or it's wiring (as it controls injectors).

I think if it's faulty, it will cut fuel pump off, not one or two injectors, but good thought

 

[SgtGoldfish]

maybe the new ECU is faulty? you probably got it used? also I would change the injector wiring harness too, you can seperate it from engine harness, if you need one, I have one

Theres no way its the ECU my 2 ECUs did the same thing nothing changed

 

[SgtGoldfish]

did you check the wires between the ecu and the injectors? have you check the resistance of the injectors? should be around 12 ohms.

if you have voltage on the black/red wires at each injector, the injectors are all reading around 12 ohms and the wires have continuity between each injector and the ecu, it has to be the ecu.

We’ve done that already not it

 

[Sirius1995]

there's not that many things that it can be, have you checked codes?

 

[SgtGoldfish]

there's not that many things that it can be, have you checked codes?

Yea theres no codes it gives out

 

[Sirius1995]

Have you hard reset the ECU?

 

[SgtGoldfish]

Have you hard reset the ECU?

No idk how or where to go to do it but i dont think its the ecu at all

 

[Sirius1995]

hard reset, I have fixed thousands of cars just by doing that, my old man taught that to me, simply unplug your terminal cables from battery, put them together with zip ties or tape or just hold them together, I normally let them just sit there zipped tied together for 30minutes and take a cup of coffee, that will erase dtc history and drain capacitors making ECU do a hard reset, just make sure that terminals won't touch battery terminals, this is an old school method

 

[dustyboner]

If anybody has a fuel injector diagram i could see why its not recieving signal

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