TBI injectors not firing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

FrankyV8 · 04-20-2015, 06:11 PM

I'm in need of some help guys!!

I've got a '93 tbi engine in my '60 c10 and more or less everything works but injectors are not firing. Engine ran when removed from donor car.
I'm thinking there is a trigger signal I'm missing or something really simple but at, I'm a little lost!! Could it be that the ecu needs a signal from the fuel pump to fire the injectors?
I can't find any pinout diagrams for these ecu's so not sure about the fuel pump signal !!

Any help is welcome!

Frank

cableguy0 · 04-20-2015, 07:38 PM

Try replacing the ignition module. It triggers both spark and injectors on a tbi engine. Its common for them to fail and wind up with people replacing the injectors and a fuel pump chasing the no fuel condition. Also make sure you have hooked up all of your grounds. The tbi engines are pretty simple.

T and S · 04-20-2015, 10:34 PM

Also may want to check fuses. Had tbi trouble one time, bad injector also blew a fuse.

FrankyV8 · 04-21-2015, 11:51 AM

Thnx guys,
@cableguy0: I'll meassure the ignition module tonight. But I have spark so me thinks it should be okay?? Or not?
@Tom, fuses are ok, I've checked them.

Are there any sites for ecu pinout diagrams?

FrankyV8 · 04-21-2015, 04:04 PM

Ok guys,

Problem solved, what I was thinking (ecm needs signal that fuel pump is on) was the trigger why the injectors would not fire!
Engine fired right up
Happy camper......

04-20-2015, 06:11 PM	#1
FrankyV8 Registered User Join Date: Jan 2014 Location: Holland Posts: 82	TBI injectors not firing I'm in need of some help guys!! I've got a '93 tbi engine in my '60 c10 and more or less everything works but injectors are not firing. Engine ran when removed from donor car. I'm thinking there is a trigger signal I'm missing or something really simple but at, I'm a little lost!! Could it be that the ecu needs a signal from the fuel pump to fire the injectors? I can't find any pinout diagrams for these ecu's so not sure about the fuel pump signal !! Any help is welcome! Frank

04-20-2015, 07:38 PM	#2
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	Re: TBI injectors not firing Try replacing the ignition module. It triggers both spark and injectors on a tbi engine. Its common for them to fail and wind up with people replacing the injectors and a fuel pump chasing the no fuel condition. Also make sure you have hooked up all of your grounds. The tbi engines are pretty simple. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

04-20-2015, 10:34 PM	#3
T and S Registered User Join Date: Dec 2013 Location: Oak Ridge, Mo. Posts: 301	Re: TBI injectors not firing Also may want to check fuses. Had tbi trouble one time, bad injector also blew a fuse. __________________ If you don't like this pound sand .....

04-21-2015, 11:51 AM	#4
FrankyV8 Registered User Join Date: Jan 2014 Location: Holland Posts: 82	Re: TBI injectors not firing Thnx guys, @cableguy0: I'll meassure the ignition module tonight. But I have spark so me thinks it should be okay?? Or not? @Tom, fuses are ok, I've checked them. Are there any sites for ecu pinout diagrams?

04-21-2015, 04:04 PM	#5
FrankyV8 Registered User Join Date: Jan 2014 Location: Holland Posts: 82	Re: TBI injectors not firing Ok guys, Problem solved, what I was thinking (ecm needs signal that fuel pump is on) was the trigger why the injectors would not fire! Engine fired right up Happy camper......



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