Bike still won’t start pls help

[HotRods&Heels]

So I’ve replaced the head, spark plugs, throttle body assembly almost all sensors and it turns over, it cranks but just won’t start. I don’t get it

[Bumblebee]

So I’ve replaced the head, spark plugs, throttle body assembly almost all sensors and it turns over, it cranks but just won’t start. I don’t get it

So I guess all the obvious questions are covered:

Fuel pump is priming
You have spark
Compression is good
All connectors are plugged in

[HotRods&Heels]

Yes
Yes
Yes yes


What I don’t have is pulse coming from the injectors

[HotRods&Heels]

I have fuel making it to the fuel rail it’s just not spraying into the cylinders

[Bumblebee]

So you have the same issue you had before the head swap?

Before some thought it was a timing issue but that has obviously been resolved....

Did you use the same throttle body assembly?

You may have to test the fuel injectors to make sure they are working..

[HotRods&Heels]

So you have the same issue you had before the head swap?

Before some thought it was a timing issue but that has obviously been resolved....

Did you use the same throttle body assembly?

You may have to test the fuel injectors to make sure they are working..

Yes exactly except the only thing different now is that it doesn’t backfire. How do I test the injectors? It does the same thing when I swap the throttle body assembly with different injectors too though

[HotRods&Heels]

I have two throttle body assemblies with injectors and neither work and I spray starting fluid and it does nothing at all

[Bumblebee]

I have two throttle body assemblies with injectors and neither work and I spray starting fluid and it does nothing at all

Gotta be a sensor or maybe the ECU?

@sixpack577 what do you think?

[sixpack577]

Gotta be a sensor or maybe the ECU?

@sixpack577 what do you think?

Yep, sounds electrical.
I would first check for power at the injectors, and if the fuel pump is priming.

[HotRods&Heels]

Yep, sounds electrical.
I would first check for power at the injectors, and if the fuel pump is priming.

Ok so the pump is priming, it’s sending fuel to the fuel rail but no further. I absofuckinglutely suck at anything electrical lol but from what o tested there is no power at the fuel injectors. But I did put a known good ecu from a very good running bike and it did the same thing.

[Dnyce]

Does it have a pc?

Also the injectors won’t have power continually unless it’s running. What was the original problem thread, maybe combine em so it shows the whole picture

[GMbusa]

Check your connectors and wires. Always start simple and work up from there.

[202mphbusa]

Does it have a pc?

Also the injectors won’t have power continually unless it’s running. What was the original problem thread, maybe combine em so it shows the whole picture

I think you are mistaken
Injectors like Coils get 12v constant
Grounds are controlled in ECU

[LC4CARL]

Not running on starting fluid indicates other than fueling problems. Hmm.

[Kiwi Rider]

Use a noid lamp to test for pulse at the injector connector harness side.

[GMbusa]

Better yet, check all your grounds first

[202mphbusa]

Not running on starting fluid indicates other than fueling problems. Hmm.

I missed where he said it would not start on starting fluid

[LC4CARL]

Are these "batch" or "sequential?"

[202mphbusa]

Are these "batch" or "sequential?"

OEM is sequential