[Pontiac48]

I drove the truck in the garage and removed the engine. I had two bent valves. I removed the engine, had it rebuilt, and put it back in the truck. I tried to start it and no spray from the injectors. I can pour fuel in the throttle body and it runs. I have checked and replace the ignition module, the fuel pump and sock, the fuel relay,and the computer.I checked the fire at the injectors and had fire. I checked the harness with special round test light and it does nothing. I have tested all of the circuits in the module and ignition module to be sure that all have a ground, and they do.I have not replaced the pickup coil yet.

[Pontiac48]

I drove the truck in the garage and removed the engine. I had two bent valves. I removed the engine, had it rebuilt, and put it back in the truck. I tried to start it and no spray from the injectors. I can pour fuel in the throttle body and it runs. I have checked and replace the ignition module, the fuel pump and sock, the fuel relay,and the computer.I checked the fire at the injectors and had fire. I checked the harness with special round test light and it does nothing. I have tested all of the circuits in the module and ignition module to be sure that all have a ground, and they do.I do not get the 2 second prime but do get pressure after the oil pres. Gets up.I have checked for fuel pressure and have it after the eng.turns over a while. I have not replaced the pickup coil yet.

[TxGreaseMonkey]

. Test all under hood and under dash fuses with a test light or multimeter:

https://www.askmehelpdesk.com/cars-t...tml#post252145

. Clean main ECM ground.

. Check ignition switch for wear, pitting, or melting.

[CaptainRich]

If you can supply fuel and the engine runs, it's not ignition related.
You tested the injector harness (with special round light) but didn't get anything, you need to check first for power to the injector. If you have power, then the ground path, provided by the ECM is missing. You may need an ECM.

[CaptainRich]

Duplicate post

[TxGreaseMonkey]

Yes, it's very annoying!

[Pontiac48]

If you can supply fuel and the engine runs, it's not ignition related.
You tested the injector harness (with special round light) but didn't get anything, you need to check first for power to the injector. If you have power, then the ground path, provided by the ECM is missing. You may need an ECM.

I have replaced the ecm. I have redone the grounds to the back of the head, frame. Where would the ground from the ecm be located. I put the two grounds that were on the intake and thermostat housing on the thermostat housing together. I have checked to make sure the engine is grounded to the frame and that the ground leads are grounded to the motor. I painted the engine , but scraped all places where there was a ground lead to be anchered. When I tested the injector harness one side was hot and the other side was not on each harness.

[CaptainRich]

I have replaced the ecm. I have redone the grounds to the back of the head, frame. Where would the ground from the ecm be located. I put the two grounds that were on the intake and thermostat housing on the thermostat housing together. I have checked to make sure the engine is grounded to the frame and that the ground leads are grounded to the motor. I painted the engine , but scraped all places where there was a ground lead to be anchered. When I tested the injector harness one side was hot and the other side was not on each harness.

Power is supplied to one lead, the ECM provides ground on the other.
You've gotten me very confused. You said,

I checked the fire at the injectors and had fire. I checked the harness with special round test light and it does nothing.

Are you checking for injector pulse while running/cranking?
If so, and you don't get injector pulse but you do have power, you likely need an ECM. Let me know and I can help with that, too.

[Pontiac48]

Power is supplied to one lead, the ECM provides ground on the other.
You've gotten me very confused. You said,

Are you checking for injector pulse while running/cranking?
If so, and you don't get injector pulse but you do have power, you likely need an ECM. Let me know and I can help with that, too.

I am checking with a regular test light, the ignition on, and engine not running, the injector harness at the end of the injector harness. I am getting one wire hot and one wire not on each harness at the injectors.
Then I checked the same harness at the same place with round test light(strobe/pulse) and with the engine turnning over I am get nothing. No light at all. I have replaced my ecm with a new one. If you could send me your number I would like to talk or mine is 704-929-9582. My email is [email protected]

[Pontiac48]

I found the problem. It was the ground that went to the ground stud in the thermosat housing. I clean this stud twice before. I changed the ground wire to the a/c bracket and it fired right up. THANKS to everyone for their help.

[CaptainRich]

I found the problem. It was the ground that went to the ground stud in the thermosat housing. I clean this stud twice before. I changed the ground wire to the a/c bracket and it fired right up. THANKS to everyone for their help.

Outstanding!
Perseverance pays off.
It's good that you back-tracked on that poor ground.

[carlos80]

I have same problem with no injector pluse I changed ecm and have power going to injector I still do not get a pluse and checked grounds

[CaptainRich]

i have same problem with no injector pluse i changed ecm and have power going to injector i still do not get a pluse and checked grounds

Carlos, when you replaced the ECM, did you need to do any security programming?
What motivated you to replace the ECM? DTCs and/or any symptoms, please...

https://www.askmehelpdesk.com/cars-t...le-303903.html

[femafixcar]

Hi everybody. Can somebody help me I have a chevy silverado 1990 k150, I changed the intakemanifol but no gas in the injectors I changed relay, fuse, ecm, fuel pump, filter but everything its OK,what can I do next step helppppppp Please Thank You. Fema.