Do you have spark? Distributor sends signal to the ECM to trigger injectors, ECM controls ground for injectors.

 

Yes I have spark It will run if I pour gas in the throttle body. So could the module in the distributor be the problem?
Thank you for your reply

 

Could be module, , ECM or a bad ground wire. I have a bad memory so I need to look at the manual for the test. Do you have access to any manuals?

 

Yes i ordered one at the parts store chiltons it hasnt helped very much yet.
I have replaced every module and sensor on top of the motor and the distributor from my 1993 gmc truck and it was running so I know they are good parts the ecm will not interchange truch is a stick , suburban is automatic
so I havent tried that yet . It always had a drain on the battery I think I found part of that though while checking ground wires I found a problem the ground on top of the motor at the thermostat neck has 9 volts running through it so im tring to find the short. I dont know if it will help the injector problem though.
Thanks for helping with this as Im totally lost.

 

Could the injectors be clogged with varnish from evaporated fuel?

 

The injectors are working good , I took the throttle body off my running truck . Im thinking it might be a wire some where that is chewed or broken.
But Im not sure at all. Seems to me there should be a relay to make them work kinda like a relay for the windshield wipers have but I havent found one.

 

The way the injectors work is they have constant +12 going to them and the ECM grounds the other wire to open the injector. It only pulses them on briefly so you can't check this with a voltmeter. You need what is called a "Noid Light" to test whether the injectors are being pulsed by the ECM. This is available as a loaner tool from most auto parts stores.

You might also want to get a scan tool and check the ECM codes. It may tell you if it is missing a critical signal because a wire is cut.

Luckily, the fuel injection system on these trucks is pretty simple, so with a wiring diagram, test light and volt meter you should be able to check out pretty much everything.

 

It was the ecm , just wanted to update and say Thank You !!
farmerjack