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Tach jumping around when cold

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    #1

    Tach jumping around when cold

    Got an issue, where my tach jumps around when the car is cold, I can hear the motor and the RPMs are steady, but the tach is jumping. I also have a problem that seems to be a fuel issue(car dieing and running rough mainly at lower RPMs) and was about to change the fuel filter and clean the injectors, but then this problem came about.
    I recently(2 weeks) replaced the Ignition control module, cap, rotor.
    Any ideas would be helpful before i just start tearing everything apart.
    Tags: None
    #2
    check if egr is stuck open.
    I <3 G60.

    0.5mm Oversized Stainless valves and bronze guides available. Pm me please.

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      #3
      A jumping tach is usually caused by an igniter (ignition control module) going bad. Where did you aquire the replacement igniter? Was it used? I would take it back to wherever you got it, and have them give you another one. Its not uncommon for new parts to be defective.
      PT3/6 Development Thread | My 1991 LX Coupe | DIY: 90-93 Tcu Fix

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        #4
        too bad he already replaced it. they usually go out during driving and not at idle.
        I <3 G60.

        0.5mm Oversized Stainless valves and bronze guides available. Pm me please.

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          #5
          Like i said before, its possible that the ignition control module he installed 2 weeks ago is on its way out. (in response to the tach bouncing and not corrisponding to how the engine is running)

          As for your drivability problem at low rpm, a bad o2 sensor can cause this. (car dieing and running rough at low rpm)

          A way to check if its an o2 sensor related issue is to just unplug it, and see if the drivability problem persists with the o2 sensor unplugged. (it will throw a cel)

          To see if its an egr related issue, you can always put a screw / plug the vacuum line for the egr, and see if the problem persists. (it will throw a cel)
          Last edited by cloudasc; 09-29-2009, 01:35 AM.
          PT3/6 Development Thread | My 1991 LX Coupe | DIY: 90-93 Tcu Fix

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            #6
            A jumping tach can also be caused by a bad ground. Check all your grounds and make sure they have a good connection.

            Originally posted by cloudasc View Post
            To see if its an egr related issue, you can always put a screw / plug the vacuum line for the egr, and see if the problem persists. (it will throw a cel)
            Actually I have my EGR disconnected and the vacuum line plugged with a screw and I do not get a CEL. Weird huh?
            Last edited by AbsurdNY; 09-30-2009, 02:33 AM.


            PARTING OUT MY 1990 EX COUPE!! EVERYTHING FOR SALE! CLICK HERE
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              #7
              Originally posted by AbsurdNY View Post
              Actually I have my EGR disconnected and the vacuum line plugged with a screw and I do not get a CEL. Weird huh?
              When I tested mine (for what ended up being a bad o2 sensor), the electrical for it was still hooked up.
              PT3/6 Development Thread | My 1991 LX Coupe | DIY: 90-93 Tcu Fix

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