Question about Chevrolet S 10

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1983 chevy s10 4cly i have no fuel coming out of injector i have replaced puel pump injector and tps

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  • bert montano Apr 06, 2011

    yes mister darklord i have power to injetor can you tell me what the voltage should be

  • bert montano Apr 07, 2011

    mister dark i have traced fuel all the way to throttle body

  • bert montano Apr 09, 2011

    this one has 12 volts sometimes when i dump fuel down the throttlebody it will run for a day the next day back to no start and i have changed the injector two tlmes by the its only a four cly

  • bert montano Apr 11, 2011

    i have asked one expert and didnt get what i needed

  • bert montano Apr 12, 2011

    im sorry that is a 1989

  • bert montano Apr 16, 2011

    im sorry that was a 1989 s10

  • bert montano Apr 17, 2011

    yes im sorry its an 89

  • bert montano Apr 17, 2011

    i know it has power going to injector i will go test to see if it blinks or not

  • bert montano Apr 23, 2011

    i changed the ecm and got the same results power at the red wire but it does not blink during cranking

  • bert montano Apr 24, 2011

    did you get my last post i changed the ecm and even before i did that i traced the injector wires all the way back to computer and found no breaks or anything anyway it still dont let no fuel out of the injector it has power to red but power stays on during cranking it does not blink help me please

  • bert montano Apr 25, 2011

    im sorry im trying to help my cousin and he is the who fires out with these parts but any way i have steady power to red wire and i will go back today after work and check the blue wire and get back to you this afternoon and the previous owner took out the check engine bulb inside the dash out so its kinda hard for me to retreive anything

  • bert montano Apr 26, 2011

    ok i just got back i have nothing out of blue wire

  • bert montano Apr 26, 2011

    did you get my last message i went after work yesterday and i checked the blue wire no power so i will wait for you before i do anything else

  • bert montano Apr 27, 2011

    ok its been two days are you still willing to help me

  • bert montano Apr 27, 2011

    i. did not have injector pluged in i will try again with it plugged in

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  • Master
  • 4,803 Answers

Before we get into this, you might want to take a look at this article: What Else Could Be Wrong?

Now for your "no fuel" problem. The first thing we need to do is make sure we are talking about the correct vehicle... I understand you to say 1983 Chevrolet S-10 Pick-up with fuel injection? Something is not right with this picture - either the vehicle has been drasticly modified or I am misunderstanding you somehow. There are no S-10's that I can find with an injected 4-cylinder engine in 1983. Straighten me out please.

Posted on Apr 11, 2011

  • 3 more comments 
  • dttech
    dttech Apr 17, 2011

    I'm sorry. I got 2 emails telling me that you had left comments and when I looked at this page, I could not see any changes. Now I see that you have left several comments and I have failed to respond. I appologize for this!

    Anyway, 1989 S-10... Lets see...
    This is a very simple system.
    First, pull a spark plug wire and crank the engine and see if you have spark to your spark plugs If there is no spark, we need to diagnose your ignition system. If there is spark and there is no fuel spraying from the injector, then we need to diagnose your injector circuit. (See the injector circuit diagram)
    The ECM 1 fuse provides the power for the circuit on the RED wire and the power goes through the injector and the ECM switches the ground on and off to fire the injector. (This part is VERY simple) If the fuse is blown, there is a short to ground somewhere in the system that needs to be found and repaired. You can use a regular test light to check these circuits. Just connect one end of the test light to a known good ground (preferably the negative battery post) and connect the other end to the BLUE wire at the injector connector. (Leave the injector connected and probe down through the connector) With the ignition ON, the light should light up. When the ignition is turned to the CRANK position, the light should "blink" as the ECM grounds and un-grounds the blue wire.

    If the light just comes on and stays steady (does not blink) the blue wire could be open between the injector and the ECM or you may have a defective ECM. (We are assuming at this point, that you have spark - problems with the ignition system can also cause this to happen)
    If the light does not light up at all, check power on the RED wire. If there is power on the RED wire and no power on the BLUE wire, the injector is bad. (open circuit) If there is no power on the RED wire, check the fuse. When you check the fuse, check it with a test light with the ignition in the RUN position. If there is no power at the fuse, you most likely have a bad ignition switch. If there is power at the fuse and the fuse is not blown, then you need to repair the wire between the fuse and the injector.
    If you don't have spark when you check it, let me know and I'll post some information for your ignition system.

  • dttech
    dttech Apr 17, 2011

    P.S. Sorry! The injector circuit diagram did not post. I Can't get it to post in a comment - it will only post in an original "solution" If you think you really need it I can Rmail it to you if you want to post an email address. (Not really recommended)

  • dttech
    dttech Apr 25, 2011

    OK, finally got your post. I don't know what the delay is - I check my messages twice a day.
    Anyway, the RED wire SHOULD stay on steady during cranking. It is the BLUE wire that is supposed to blink.
    Why do you go off replacing things like ECM's when you don't know what is wrong? The point of Do-It-Yourself is to SAVE money....You will pend MORE money if you keep doing things like that. I will work with you to get this thing fixed, but I cannot help you if you just go off and do stuff on your own.

    There are a few things you need to check - Is there power on the BLUE wire? Does the BLUE wire blink?
    Have you retrieved fault codes from the ECM?

  • dttech
    dttech Apr 25, 2011

    The Check Engine bulb was probably removed because there was a problem and the previous owner probably did not want to spend the money to fix it. There is a very good chance that this is why you are having problems now. You need to get the bulbreplaced so the system can be diagnosed properly. Otherwise, you could be just blowing in the wind.

  • dttech
    dttech Apr 27, 2011

    OK. Look at my original "comment". Are you checking the blue wire at the injector with the injector plugged in? You can use a paperclip to "back-probe" the connector if your test light tip will not make contact through the back of the connector. If you have no power there when you do this, the injector is bad. (open circuit) If the light lights up with the key in the ON position, this is when you try to crank it and check for "blinking". The power SHOULD be going THROUGH the injector from the RED wire to the BLUE wire. The blinking is caused by the PCM grounding the blue wire to make the injector fire.

    '
    Also please be patient with me. I work a day joband do this at night as a community service/hobby...I will not always get back to you real fast, but I WILL get back to you.

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  • Master
  • 2,427 Answers

Check and see if your injector is getting power, you can use a multimeter to test the wires as you tumble.. if not check the fuse for it,, in the fuse box under the hood, if the fuse is good check that the ecu (Pcm or cpu) is sending a signal to the injectors,, again use a multimeter to check the wires. To find the exact wires, trace it back through the harness from the injectors.. remember the color codes,, its the same right through.

Posted on Apr 05, 2011

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  • Rishi Roshan Ali Apr 07, 2011

    once the injector has power your injector isnt at fault..

    locate the fuel filter on the car, remove the hose leading to it, put the hose in a glass jar, turn the ignition on, gas should flow out into it (if not check your fuel pump fuse or if the pump is getting power if so then this pump is bad as well),,

    ok now connect back the fuel filter and remove the hose leading to the injector rail, put that in the glass container, turn ignition on again, if there is no fuel replace the fuel filter of make sure it isnt connected opposite as to how it should be, or there is a clog in the line.

    post the results of these test.

  • Rishi Roshan Ali Apr 08, 2011

    then the problem has to be with the injectors,, once the rail has fuel it means the injectors are not opening, Can u\you get a diagnostic test done,, this can be computer or low power to the injectors, some use 5 v other 12 v..

  • Rishi Roshan Ali Apr 13, 2011

    what about the throttle body sensor ? did you check that ? that helps control the air fuel ratio so if its malfunctioning it can cause the vehicle to send no fuel.

  • Rishi Roshan Ali Apr 17, 2011

    if dumping fuel down the throttle body help,, the the problem is with your mass air flow meter , oxygen sensor,,

    replace it its on the throttle body, it will solve your problem.

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