Question about 2000 Chevrolet S-10

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1988 Chevy S10 2.5

I'm not getting any signal to the throttle body injector to operate. Fuses, fuel pump and pressure are good. There are no broken wires or connections and I have good grounds to negative on the battery and chassis. I'm suspecting the ECU but no troubleshooting codes have been set. Could another sensor cause the ECU to not send a signal to the injector? Any suggestions would be greatly appreciated.

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  • delia3 Sep 29, 2008

    I'm getting plenty of spark. The engine will run for a short time if a small amount of gas is poured in the throttle body. It does not have a cam sensor that I'm aware of. It's not an overhead cam engine.

    Could the electronics in the distributor detect engine rotation?

  • delia3 Sep 30, 2008

    I have 12 volts on my red injector wire. My blue wire back to the ECU has continuity so the only thing left is the ECU. I will order one tomorrow and see what happens. Thank you very much for the

    helpful advice and the diagram.

  • delia3 Oct 01, 2008

    Will do, Thank you again! ECU is on order and should be in by Friday.

  • Anonymous Apr 28, 2009

    no injecter pulse new ecm weak fuel presure suspect oil pressure switch

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Chack and see if your security light is staying on if so then security is shutting down fire to injectors.
are you gettting spark? pcm needs to see a signal from cam sensor to fire injectors. also when you first cut key on you should see the injectors give an initial shot of fuel

Posted on Sep 29, 2008

  • TripleTauto
    TripleTauto Sep 29, 2008

    sorry saw 2000 s10 up top



    you should have 12volts on red wire of injector plug this tees off of ecm1 fuse if you do not have power here then wire is broke somewhere. this same power source goes to egr solenoid so check it for voltage the ecm triggers a ground signal so if you have power and no ground then it is most likely a bad ecm here is a diagram

  • TripleTauto
    TripleTauto Sep 30, 2008

    be sure to swap out the prom from your old computer

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460 ford engine after being parked for 2 yrs wont start unless i feed gas into throttle body then not only does it start but stays running untill i quit feeding it gas.


Sounds to me like you are not getting any fuel to the engine, if you do not have fuel pressure to the throttle body then I would check the pump, if you do have pressure to the throttle body then your injectors are not opening.

Sep 09, 2014 | Cars & Trucks

Tip

My car just died while driving


If you had an otherwise normally* operating vehicle and while driving just decides to die on you then your problem will most likely be lack or inadequate spark/fuel, most likely fuel related in my experience.
*by normal I mean no overheating, starts fine every time


Tools that may be required - test light ($5), needle nose pliers ($5)
First check the basics such as fuses and spark plug wire connections. make sure all your plug wires are plugged in securely. If so check to make sure any ignition related fuses are not blown. You can do this either by removing and inspecting for any broken fuses or hooking a test light to a ground and probing both sides of the fuse (key must be in the "on" position for this).


Still nothing check for spark at the plugs. Do this by taking your test light and probing one of the plug wires near the plug. Have someone crank the engine, the light should be blinking as engine is turning over. Do this for all wires. If you get a signal each wire, disconnect one of the plug wires, remove the plug and reconnect wire. Have someone crank engine. You should see blue sparks coming from the plug as the engine rotates.

Repeat for all cylinders. (you could also skip the first step and just do this)
If you don't get a spark at a particular plug, then you will need to probe each connection (the wire at the plug, the wire coming out of distributor/coil, the wire coming out of the coil. By doing this you will be able to pinpoint where the damaged component is. If you have nothing into the coil than it is likely an ignition related fuse/relay (solenoid on Fords) is bad.
If you are getting spark to each plug then your problem is fuel related.
To test fuel you will need a fuel pressure gauge (rent for free at auto parts store or pick up a gauge for around $30)
Hookup the fuel pressure gauge at check point (hookup point will vary depending on the vehicle but will likely be on the fuel rail or the throttle body on injected vehicles). Also when you rent/buy the fuel gauge ask them to lookup the fuel pressure. Probably around 40psi and up for a functional fuel system (injected) about 4psi for carbureted (look up pressure at parts store or manual for specific application).
If your fuel pressure reads low, then your filter or pump is bad. Replace the filter and recheck, if still low, replace the pump.

If your pressure reads good than it is likely that your crank and/'or cam sensor(s) or injectors are malfunctioning. The crank/cam sensors are what tell the computer when to fire the injectors. Probe the injector connectors while cranking the engine (there are two wires, one should blink when cranking the engine. If you get a signal than the injectors are bad.
If you still are having issues, than you may have a wiring problem or bad ECU

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