Injectors not getting pulse?

[Tico Frank]

Ok, so I am pretty close to getting this thing running. Here is what I know. There is Fuel, and Spark. There is constant to the injectors. '

BUT the injectors won't pulse!!


I had a friend come over with his running swap so I could borrow parts to eliminate potential issues.

#1 Its not the adapter unless there is an injector wire I am missing since I used a Sedan adapter and I own a vert.

#2 Its not the Crank Position sensor. Swapped with working.

#3 Its not the MAF

#4 Its not the Engine grounds (motor mount and oil pan are grounded)

If my friend uses a test light to ground the injector that individual injector will fire and the car will try to run on one cylinder and if he starts grounding various injectors the car will try to run. Also it will run for a quick second when there is starting fluid put in.

Later this week I will swap the whole injector rail as it was too late for anymore testing tonight.

Any thoughts are appreciated!!

[Tico Frank]

Anyone?

[Tico Frank]

Please help if you have any ideas on why my injectors are not getting a pulse.

[5Toes]

Cam position sensor controls fuel injector firing if I dont recall

[328ijunkie]

If theres no cam sensor the injectors will just batch fire (like M20) so thats not problem. Check Grounds.

[Tico Frank]

So I still have not fixed this because I have been busy but one thing I found was that the #6 pin in the back of the DME is the ground pin so I was wondering if I could test this ground somehow or if I could ghetto rig a ground to this pin just to see if that is the issue? Any advice is appreciated

[cormier]

It should ground on the passenger strut tower. You can meter from that pin to that ground with the dme unplugged to make sure it isn't broken

To recap-- fuel pump working for sure ie pressure at the rail? What dme/chip you using? Have you tried another computer?

[woc]

similar situation with m50 413 dme.
My Main relay wiring is bad. check you relays! the 3 mais relays at drivers side tower.

[woc]

Also check your coolant temp sensor, for some reason the dme wont start the car if sensor is bad. (maybe cuts injection pulse for some reason?)

[Jezza]

I am having the exact same problem with my swap, have you resolved your issues?

[328ijunkie]

faulty C101 wiring can also cause this.

[Jezza]

Went over my wiring and found two connections mixed up. But does anyone know the pinouts on the dme connector to get the injectors to fire?

[Tico Frank]

I am still struggling with this issue. Can anyone tell me what signals the ECU needs to see to then send out the pulse signal to the injectors?

I am pretty sure it needs to see the crank position sensor at a minimum. But is there anything else it needs?

[328ijunkie]

crank sensor. If theres no cam sensor it will batch fire the injectors (like an M20)

[brenE30]

If my friend uses a test light to ground the injector that individual injector will fire and the car will try to run on one cylinder and if he starts grounding various injectors the car will try to run. Also it will run for a quick second when there is starting fluid put in.

Later this week I will swap the whole injector rail as it was too late for anymore testing tonight.

Any thoughts are appreciated!!

Did you check your fuel rail ground? You pretty much answered you own question. If by grounding the injectors they start working, then a ground problem is what you have. Now find it