No pulse to fuel injectors

if you have spark at all cylinders then you dont have a bad crank shaft sensor.

first are you sure your getting fuel to the injectors and of enough quantity? perform a fuel pressure test.


next thing to check is if you have power at fuel injectors hook ups by throwing a noid light in there and cranking it if it flashes then you have injector pulse, if not check for voltage comign to it with the key on, one should be hot and the other no voltage at all.

let me know what you find.

I have connected a noid light to one injector. The light did not respond when the ignition was cranked. I dont know if I need a certin light for the make of the vehicle, but I did buy a set and one out of the set fit and like I said did not blink, stay on, or anything so that would be how I came to the conclusion of not getting any pulse to my injectors.
I would check the relay. Problem is there is pictures on the fuse case and I cant seam to figure out wich one it would be. there is a few little pictures that look like a little engine.
I suppose it would be one of them but no parts house even with a cross reffrence can get one.
I do appriciate your advice. If you could get back to me I might find a way to send a money order or somthing so that i can contribute to your site. I know the world is tough out here and if you can make a buck make it but I see you all are trying to provide a lagitamite service and am willing to contribute.

Hello,

There is an ignition failure sensor that can go out causing the injectors to stop working as a safety feature. here is a wiring diagram that can help you test for the problem.

Check to see if everything is getting power and a good ground.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please run some tests and get back to us so we can continue helping you.

Best, Ken

Electrical problem
1996 Mitsubishi Eclipse 4 cyl Front Wheel Drive Automatic 135000 miles

trying to find out why car is running on 2 cyl's, cyl's 1 and 2 are working fine but 3 and 4 injectors are pulsing only every now and then. got a used ecm and it is still pulsing inj. 3 and 4 Intermittently. any ideas on this problem

What is the spark doing on those cylinders. Is it acting the same way?

yes we have good spark on all cyl's

Although it would require some testing with a lab scope to find out, it sounds like the ignition module may be having a problem forwarding the tach signal to the PCM but that's just a wild guess.

thanks wrenchtech, do you think the ignition module could only cause cyl's 3 and 4 to pulse every 3 to 4 seconds? thanks

Yes, I just said it was POSSIBLE but I'm NOT saying to automatically replace it.

is'nt the ignition module in the ecm?

Yes, after looking at the wiring diagram again, it appears you are correct. I thought that one had a separate igniter but it doesn't.