help! injectors not fireing

[jaysee]

hey i just changed the head gasket and a few other things, went to start the car and it starts up but wont stay running for more than a second
i think the cold start calve is starting it but i dont think the injectors are firing to keep it running.. has fuel pressure and spark.. what could this be?
btw the car is a 86 325 eta coupe thx!

[jaysee]

also there is a green wire with red strip that runs above the cam gear, going under the car and back tword the bellhousing that got cut in half, i striped both ends and tied them togather , if that makes any diff.. is that maybe a referance sensor? and woulf that have anything to do with my no start.

[Ceeker]

How do you know the injectors are "not" firing?
the cold start valve dumps more fuel (rich mixture) to keep the car running and then shuts off once the car's reaches op temp. It is possible it is your cold start valve. If it isn't working then sure it cold fire up briefly but then stall due to insufficient fuel at start up. Basically the car is running lean at cold start. So not enough fuel to keep it running.

[jaysee]

Cold start valve works good. Took it off and turned key with it connected. Nice wide thick mist of fuel.. bout to do the same with the injectors to test them..

[jaysee]

so injectors are not fireing.. also this sensor is brike in half i shoved it back on but idk mayne this is why does any1 know what this sensor is and if it will effact the injectors?

[paperplane94]

The blue sensor(looks broken off in the photo) is the ECT sensor. I believe the car may run without it, but definitely replace that sensor as its necessary for the ecu to alter air/fuel ratios. It should be a 19mm open end wrench to remove it, be prepared to lose some coolant.



The brown one is for the gauge on the instrument cluster. THe engine WILL run without this sensor. Definitely replace the blue/broken off sensor.

[jaysee]

Does anyone know what the green wire with red strip is that runs
above the cam gear and up under the engine?

[jlevie]

Something looks wrong. An ETA should have four sensors in the top of the thermostat housing. But I can only see two.

I'd have to look up the wire colors, but that running across the upper timing cover could be for the oil pressure sensor, which is mounted just above the pan on the right side of the engine.

[jaysee]

there is 4, the other two are hiding behind the fpr took a close up with my shitty phone camera, and the green wire is comming out of the same part of the harness as the injectors are on, but yeah that makes sense..

[jaysee]

so it is confirmed the injectors are not firing, checked with a noid light, cheacked for voltage @ the injector and there is an even 12v wierd thing is, there is 12v comming out of both sides of the plug, one should be positive and the other negitive but they are both possitive? wtf? anyone have any clue what would cause this? or is there anyone in the west michigan area that has a extra eta ecu they would let me plug in to see if mines bad?

[jaysee]

i checked voltage at the harness plug with it detached red to plug, ground on engine

[jlevie]

so it is confirmed the injectors are not firing, checked with a noid light, cheacked for voltage @ the injector and there is an even 12v wierd thing is, there is 12v comming out of both sides of the plug, one should be positive and the other negitive but they are both possitive? wtf? anyone have any clue what would cause this? or is there anyone in the west michigan area that has a extra eta ecu they would let me plug in to see if mines bad?

System voltage is supplied to the injectors and the DME grounds one side to cause them to fire. So seeing 12v on both pins is normal when the DME isn't firing the injectors.

It sounds like the injectors have power, but no firing pulses. If the engine has spark when cranking the cause will be a wiring fault or a bad DME.

[jaysee]

okay.. i thought it would only show on both sides if the harness was still pluged into the injector.
how would i go about checking for a wiring fault?

[RagtopE30]

when you did the head gasket repair did you disconnect the sending units that are attached to the bellhousing? If you did make sure they are connected correctly, they both fit in both the female sides of the wiring harness but the engine will not fire if they are not connected properly. Try switching the two plugs with one another and see if that works. another thing is to make sure that the two sending units on the thermostat housing that were hiding in the pictures are connected properly. The wire harness ends should have matching colors for the sending units they belong to. There are two brown connectors but only one is long enough to reach the furthest forward sending unit the other brown one goes to the sending unit closer to the fuel rail. Good luck

[jaysee]

i never dissconnected them, but there could still be a problem, ill check the resistance reading on them tomarrow, i do have spark though.. what one would have to be bad for me to have spark but no injectors? and thx for the luck i need it