87 c10 tbi

[Sharpie]

Thanks for letting me join and having somewhere to gain knowledge.

Have no spark and no spray of fuel from injectors. Ignition module has been checked & is good. Pick up checked & good. Have 12v at coil and 12v at the dist. Power @ coil in cranking mode. All fuses are good ECM1 & 2 & gauge/idle. Checked codes only 1 I get is 12. Fuel pump runs when switch is first turned on and will start running after oil pressure is present. New cap and rotor button. Any suggestions as where to go next?

 

[bucket]

What's the back story? Was it running and just quit one day?

Who checked the module? That's the likely culprit.

 

[1987 GMC Jimmy]

Agreed. I would say check the ignition module again if you can. Hell, check it more times in a row. Those things can work properly in terms of spark, but they can partially fail in terms of mediating grounds/signals between the ECM and injectors that make them pulse. Sometimes the machine will pass a bad module and fail a good one. I just went through an ICM episode a little while back. If you don't get anywhere with that, I'd look at my fuel pressure to make sure I'm getting consistent pump operation, and I may even look at my ECM. They can do weird things sometimes.

 

[Sharpie]

Truck has been sitting for a while. Ran when parked with issues. 1 fuel pump didnt work and 1 injector didnt spray it dripped. Removed tanks and cleaned replaced both pumps. Rebuilt TB installed new injectors. Ing module checked on test machine approx 8 to 10 times to heat it up checked good (AZ). Replaced coil because of corrosion on terminal. Pick up coil test good.

 

[Sharpie]

Update. Ign module made it fire. Thanks for the sounding board.

 

[bucket]

Cool. It sounded like the symptoms of one of them pesky little buggers.