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jumpy tachometer

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    #1

    jumpy tachometer

    So im currently sitting in the parking lot at work and I notice my tach is skipping all over the place. Its not surging or anything and I even killed all loads on the battery and it still did it. When I gave it gas to see if it continued through out the rpm's it went away. I'm thinking maybe an electrical issue? I know my battery isn't in the best shape anymore so could that be the culprit?
    Tags: None
    #2
    sounds like the ignition control module, which can be tested at most auto part stores for free

    http://www.cb7tuner.com/vbb/showthread.php?t=187851
     sold to: cb7rush\h22-accord\Luis\BurtonRiderT6
    bought from:jokerxfn-tommi-'93cb7ex

    Comment

      #3
      Originally posted by 904drACCORDMANG View Post
      sounds like the ignition control module, which can be tested at most auto part stores for free
      Just to clarify, not many stores can test an igniter. The only place i have found is Autozone, and not all of them can test it.
      Originally posted by Mishakol129
      Do not disrespect my intelligence. I am the smartest person I know : )

      Comment

        #4
        Yep, generally your igniter is on the way out.

        Fairly easy to pull out. Call all your local auto parts store and see if any of them can test it.
        "There is nothing wrong with you that an expensive operation cannot prolong."

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          #5
          Snag a few from the junkyard, and keep swapping them until you see a difference. That's what I did, when I wasn't sure it was the igniter.






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            #6
            You can do some basic tests at home with a multimeter to see for yourself if your ICM is out of spec. It is basically just a large high current transistor after all.

            Comment

              #7
              Originally posted by Tw34k View Post
              You can do some basic tests at home with a multimeter to see for yourself if your ICM is out of spec. It is basically just a large high current transistor after all.
              Not really. The ICM has to be brought to operating temp for testing, the testers have a lead that hooks to the mounting plate and causes it to heat up. You can't do that with any multi meter I've ever seen.
              Originally posted by Mishakol129
              Do not disrespect my intelligence. I am the smartest person I know : )

              Comment

                #8
                You do not have to heat the ignitor to test its continuity. I also never said a multimeter had a heater function. Granted thermal changes will affect the operational characteristics of electrical components but in this case the ignitor should still be out of spec at normal ambient temperatures as well if it is indeed on its way out. If you insist on heating the unit Im sure you can get it pretty hot with household items like a blow-dryer.

                TO do this check yourself simply check resistance between the terminal on the side and the one on top directly next to the one located on the side. spec window is between 1 and 3.3k ohm IIRC.

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