No injector pulse no start

So key in the run position you have battery voltage to all the injectors and your just missing the ground pulse side of the injector control? I would check the fuse #10 which powers the injectors. Here is a guide on how to test for power at the fuse:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Here is a engine wiring diagrams so you can see how the ignition works.

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

Cheers

I have this problem #2 injector was shorted blew the fuse had to replace it all fixed now. I love this site.

I have checked all the fuses and fusible links I have fire to the plugs. I have a pulse on white wire from distributor to ext coil. I replaced ECM just to see if that would fix it, no it didn't. It has a new GM fuel pump. Any help I have worked on this truck for 3 days and can't find the problem. Thank Gary

gary i need a little more to work on. does it run on starter fluid? this is a vortec engine, eigth letter of vin w? any codes?

It is a 4.3 Z engine code. It will run if you spray tbi cleaner into the throttle.

z engine makes it a lot easier to diagnose. does it have a check engine light on when the key is in the on position? do you have 12 at the injector feed side? are there any codes stored in memory?

It does have voltage on the injector with the key in on position. The check engine light does not light up with the key on. The scanner will not communicate the ecm. The grounds are good on the ob connector it has voltage the ob connector and I checked the tan wire from the ob connector to the ecm no problem.

thats where we need to start. double check ecm fuse, its got to be blown or there is no power at ecm or the ecm is bad. you did check the ground wire for ecm at the thermostat housing?

both ecm fuses are good 20amp fuses i've checked and double checked power in the fuse panel all is good. I checked the ground on the ts housing and it is good. The ecm has ground where it suppose too according to the wiring diagrams. I looked today to find out why the scanner wouldin't communicate. I use 3 different scanners no communication. I've checked body grounds.

What triggers the injectors---a B+ pulse or a ground pulse with a constant B+ ?? I Can't seem to find anyone who can give me a wiring schematic for this related question,so can't test further to see if I need a computor or something else.I have fuel running to the fuel rack & back thru the return line; just not getting into the cyl's. B+ is present @ one side of all injector connections.

Could be a problem with the computer injector/s driver or the computer is not getting an ignition reference signal from the CHM or pick-up coil.

Try using a noid lite and see if it blinks

Hi Eric,

If you haven't already I would also check fuel pressure and Regulator. You stated you have fuel to rail and also back through return line. If pressure regulator is bad and letting fuel flow freely back to tank then would cause no or very little fuel in cylinders.

Check link below for checking fuel pressure


https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm


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I have a 1991 Chevy S10 pickup, and the single fuel injector is not injecting gas. I don't think it is the injector, I installed a node light on the connection and it did not pulse. I ran a diagnosis with a Inoova tool kit and it says the computer does not have any DTC's. I used a meter and the red and blue wires to the connector seem to be live, so I don't think its a fuse, but I checked them anyways. Any thoughts?

do you have spark to the spark plugs and/out of the coil?the injector should only spray when cranking,

Yes, the truck will run if I pour fuel into the carb,

can you hear the fuel pump run?

Yes, the injector had fuel pressure to it. I just figured it out, when I plugged in the distributor, one of the pins got bent over and against the one beside it. Once I straightened that out, the distributor was able to send the pulse to the injector... Thanks for your advice!!

Completely new fuel system, both physical and electrical. Everything from the fuel pump and sending unit to a new distributor and injectors (TBI). Everything related to the fuel system is new. Not use. Why do I not have injector pulse? I only bought the truck for $500.00. It has already cost me over that in parts alone! Help me, please. Otherwise, there will be a giant bon fire in southwest Ohio. with an S-10 at its center.

that's great,your welcome.thanks for letting me know.

I assume this must be a TBI system. Do you have 12 volts power on one side of the injector plug with the key on?

It is, and I do.

Does the check engine light come on for bulb check when the key is turned on without starting it?

No. I can only assume the bulb is either burned out or I have got two bad computers.

Have you checked all of your fuses with a test light with the key on?

No. I can do that in the morning.

Checked all fuses. All are intact and functional.

That only leaves the ECM. I would go one step further first though. Follow a pinout diagram and verify all powers and grounds at the ECM.

I understand that the electrical systems in these vehicles can be... temperamental. And complicated. I read test the oil pressure sensor can shut the injectors off, of it's bad. True?

No, that is not true. The oil pressure switch provides a redundant power supply to the fuel pump but will NOT cut the engine off unless the fuel pump relay is bad.