94 1500 4X4 will not start & run - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Casablanca · 06-26-2011, 06:57 PM

have good fuel pressure yet the injectors in my tbi will not work. i can energize them myself and thay work. when I present bat voltage to the dist ref (pink w/white wire) from the dist to the ecm the injectors will work. I have replaced the ecm and the ignition mod and there has been no change. what can I do to get an energizing signal to the injectors in my tbi?

ChevyTech · 06-26-2011, 10:41 PM

The computer needs to receive a distributor reference pulse from the distributor module to trigger the injectors.
A bad distributor module or wiring between the module and the ECM/PCM can cause this.

You replaced the ECM and the distributor module but still get not injector pulses.

Is there spark at the spark plugs?

A bad pickup coil in the distributor can also cause no spark and no injector triggering.

Did you make sure the distributor is turning?

Welcome to the message board!

Casablanca · 06-29-2011, 10:57 PM

the truck will run on starting fluid, thus telling me that I do have spark and timing is good. I did check the pink w/white wire between the dist. and ecm, and of course it is ok also.

onequickchevy · 06-29-2011, 11:14 PM

Chevytech is right, it is more than likely the ignition module. If it is bad, the injectors will not pulse. Was your part new? I have replaced the one in our 92 work van, and my Tahoe. Same symptoms, fixed it both times. Chevytech is da' man
!
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06-26-2011, 06:57 PM	#1
Casablanca Registered User Join Date: Jun 2011 Location: Sheridan, CO Posts: 2	94 1500 4X4 will not start & run have good fuel pressure yet the injectors in my tbi will not work. i can energize them myself and thay work. when I present bat voltage to the dist ref (pink w/white wire) from the dist to the ecm the injectors will work. I have replaced the ecm and the ignition mod and there has been no change. what can I do to get an energizing signal to the injectors in my tbi?

06-26-2011, 10:41 PM	#2
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,620	Re: 94 1500 4X4 will not start & run The computer needs to receive a distributor reference pulse from the distributor module to trigger the injectors. A bad distributor module or wiring between the module and the ECM/PCM can cause this. You replaced the ECM and the distributor module but still get not injector pulses. Is there spark at the spark plugs? A bad pickup coil in the distributor can also cause no spark and no injector triggering. Did you make sure the distributor is turning? Welcome to the message board! __________________ For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too.

06-29-2011, 10:57 PM	#3
Casablanca Registered User Join Date: Jun 2011 Location: Sheridan, CO Posts: 2	Re: 94 1500 4X4 will not start & run the truck will run on starting fluid, thus telling me that I do have spark and timing is good. I did check the pink w/white wire between the dist. and ecm, and of course it is ok also.

06-29-2011, 11:14 PM	#4
onequickchevy Registered User Join Date: Sep 2009 Location: Marianna, Florida Posts: 339	Re: 94 1500 4X4 will not start & run Chevytech is right, it is more than likely the ignition module. If it is bad, the injectors will not pulse. Was your part new? I have replaced the one in our 92 work van, and my Tahoe. Same symptoms, fixed it both times. Chevytech is da' man ! Posted via Mobile Device __________________ Slowly but surely getting it done. Last edited by onequickchevy; 06-29-2011 at 11:17 PM.



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