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Dose any one know to make Noid Light tester feed back need — Parallax Forums

Dose any one know to make Noid Light tester feed back need

sam_sam_samsam_sam_sam Posts: 2,286
edited 2010-12-21 00:34 in General Discussion
Look for info on how to make a good one.............. Need to make one to fix truck which is dead right now

Comments

  • icepuckicepuck Posts: 466
    edited 2010-12-07 16:58
    If its the test lights used for EFI injector testing you all you need is a 12v test light and a DVOM to check the injector coil for shorts or opens.
    -dan
  • bill190bill190 Posts: 769
    edited 2010-12-07 21:29
    If it is a low voltage signal, I would imagine an LED with a 750 ohm resistor in series would do the trick.

    Note a fully charged car battery will be 12.75 volts or higher. And will remain about that with a load on like the headlights. If it is a newer vehicle, be sure to not run down the battery trying to start. Recharge the battery. The electronics will not work with a low battery.

    If the truck will crank and battery charged, then here is some general vehicle troubleshooting for fuel injected vehicles...

    Check the basics, Fuel, Spark, Air.

    Fuel: While someone is turning the key to start, have someone else spray starting fluid into the throttle body (just a light spray - two seconds). If you get a response, then this is a fuel problem.

    Spark: Remove a spark plug and place the side screw portion against a piece of body metal or engine metal (grounded to battery negative/ground). Then watch as someone turns the key to start. See if there is spark. Advanced spark testing is to use a spark testing tool which would typically have a gap of .25 inch. You should see a crisp blue spark. This is a larger gap than a spark plug and tests that the coil is producing a high enough voltage. (Good spark as opposed to weak spark.)

    Air: Slightly press on the accelerator while trying to start. Normally the throttle is completely closed and the IAC (Idle Air Control) valve adjusts to admit air into the engine. By pressing slightly on the accelerator, you are bypassing the IAC valve and allowing air to enter the engine.

    Combination test: While someone slightly presses on the accelerator and turns the key to start, have someone else spray starting fluid into the throttle body.
  • sam_sam_samsam_sam_sam Posts: 2,286
    edited 2010-12-08 08:10
    Voltage Probe.pdfThis is the one I am going to make and use to trouble shoot what wrong with this truck

    Thanks to all that replyed
    pdf
    pdf
    Voltage Probe.pdf
    21K
  • sam_sam_samsam_sam_sam Posts: 2,286
    edited 2010-12-11 18:50
    I builted the one in the PDF file I post

    I changed the 10k ohm resister to a 5k ohm because the LEDs where not bright enough the only problem with do that is that both led are (ON meanig that they lite) just a little which is ok when the input is floating

    Some time next week I am going to work on the truck again and let see what happen
  • sam_sam_samsam_sam_sam Posts: 2,286
    edited 2010-12-16 04:54
    Update to the problem with truck

    Found that I do not have a pulse on injectors 2 & 3
    Now if I unplug the injector # 2 then I get a pulse on injector plug
    Now injector is not easy to get to maybe today

    Found that I do have a pulse on injectors 1 & 4

    The Voltage Probe that I built works very well to trouble shoot to find out what has to this truck D.V.M. was not doing much for me and the test light was a little bit better
  • phoenix28phoenix28 Posts: 5
    edited 2010-12-21 00:34
    uhmm...very well detailed design for the Noid Light..i dont have time to experiment. Last month I buy this noid light since I badly needed it to work out and fix my car.
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