1994 Chevy S-10 Starting

Ok I tested the ECM wires at the fuse block and they tested positive(+) now the wires at the PCM I have nothing. My fuel pump is good I replaced it 6 months ago thinking it was the problem, but it didnt help. Than one day it deside to start. Now when I turn the key to the on position I dont hear the fuel pump priming the system. Something is shuting off the whole fuel injection system. And I have no clue ive done a bunch of test. I have new relays in for the fuel pump. Ive tried a new PCM ive looked at all the wiring and I just cant figure it out Please Help:-(

Alright I did that I have no power at the fuel pump and I tested the reelay its good but its not swiching on and off with the key. When I run power right to the fule pump I turns on but the injecters still do come on. I also just tested the ignition switch ever thing test good there.

Well I dont think its the computer I have tryed 2 diff computers with the same ID# and nothing changes im guess its just a wireing problem some where just need to find it. Do you have the whole wireing diagram to the computer so I no what im working with are there any sensors that would tell the computer to not turn on the injecters and fuel pump? Today I examined the wire harness for the computer. No broken or corroded wires im going through all the wires under the dash right now.

I cant read the resolution so small...

If you want since this site only let you put low pixle pics you can e-mail me them if you like. 1985sr5@gmail.com

Alright I have tested all the wire you wanted me to. I have also had me ignition control module tested and it tested good. So I than moved on the the fuel pressure switch I put a new one in. The orange wire I had like 9. Something, the distibutor ref hi (ppl/wht) tested at.131, and the distibutor ref lo (blk/red) tested at.014

I still havent found the prob. If anyone else has any ideas please let me no.

Im having this same problem. Did anyone find the solution, if solet me know hellcarrier67@yahoo. Com

We are having the same problem with our pickup as well. It turns over but no sound from pump. The pump is fine. Anyway we are unable to locate the fuel pump relay switch. Any information on locating this so we can test it would be greatly appreciated.

We replaced the fuel pump relay, but still no sound form the fuel pump. We checked and it isn't pumping any fuel through the lines either. Before we changed the relay, the pump would try to turn on right after you let off the key while cranking, but only then and for a split second. Any ideas?

We supplied 12v to our fuel pump to make sure it was pumping and the truck still wouldn't start. We checked to make sure we had power/signal at the injectors and we did. But the injectors still weren't spraying. So I decided to clean the injectors with B12(chemtool) and blow them out with compressed air. I didn't pay attention, but the orings expanded in the B12 so the injectors couldn't build up any pressure. All the gas came spilling out from the injector housing. I have now ordered a gasket kit from autozone(about 6bucks). I'm hoping that improves the situation. I'll post up with an update.

I replaced the gaskets and o-rings, but the injectors still didn't fire. I was told that I may have done some damage to them when I cleaned them, but I'm not sure yet. I am sure I'm getting fuel pressure, but I'm not sure whey the injectors don't fire. I read that the injectors always have 12v, it's the ground that makes them fire, so I'm gonna go try playing with that a little and see what it does. I'm very close to just pulling the motor out and dropping in a carbureted 350. This is really frustrating my whole family.

Can someone atleast give me an idea of what the problem could have been? We decided to go carbureted since TBI seems to have outsmarted us and everyone we know.