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Bad Missfire and VagCom wot connect?

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  • #1

    Bad Missfire and VagCom wot connect?

    So, Ric was kind enough to come over and plug his vag com into my golf to try and help diagnose the miss fire but the software wouldnt see the car, just wouldnt connect. When he tried it in his it worked straight away!

    so looking for help on two fronts, anyone know why it wouldnt connect to a 2000 GTI? it did work last year when one of the guys plugged in during the Dyno run, he got in no problem. anyone with the full vagcom version want to give it a try?

    And the missfire, seems to be dropping a cylinder when the boost starts to build, typical symptom of a weak spark making the situation worse under higher cylinder compression. can drive it as normal until it gets over 2000 rpm then if you ask for power above gently acceleration it starts to stutter. youve gotta say coil pack first out but just wondering if anyones had anything else similar. Plus George replaced the two most unreliable coil packs just a month or so ago (apparently this year car has two types of coils in).

    Anyone got any ideas?

    anyone got a spare coil pack i can try and diagnose with?

    anyone?
    Last edited by Kordain; 04-26-2008, 06:44 PM.
    Eric..

    Nobody knows everything, but everybody knows something you don't!
    Tags: None
  • #2
    Re: Bad Missfire and VagCom wot connect?

    I had connection problems trying to scan a car with an aftermarket deck that didn't have the K line hooked up properly. Unplugging the deck allowed it to scan.

    The software has a settings screen where you can verify the connection, that is how I found it was the K-line.
    Jeff
    Current: 2017 Audi A4 2.0T Quattro S-Line
    Previous: 2007 Audi A4 2.0T Quattro S-Line, 2001 VW Jetta

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    • #3
      Re: Bad Missfire and VagCom wot connect?

      Originally posted by FlyBoy View Post
      I had connection problems trying to scan a car with an aftermarket deck that didn't have the K line hooked up properly. Unplugging the deck allowed it to scan.

      The software has a settings screen where you can verify the connection, that is how I found it was the K-line.
      Thats interesting, i do have an aftermarket deck and i have changed it since the last time it was scanned, though it was still an aftermarket one then as well.
      Eric..

      Nobody knows everything, but everybody knows something you don't!

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      • #4
        Re: Bad Missfire and VagCom wot connect?

        Originally posted by Kordain View Post
        Thats interesting, i do have an aftermarket deck and i have changed it since the last time it was scanned, though it was still an aftermarket one then as well.
        Probably this is it.
        KR
        Porsche 991 Carrera S

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        • #5
          Re: Bad Missfire and VagCom wot connect?

          sometimes if you just turn off the deck the Vagcom will be ok... other times you may have to unplug the deck and any jumper harnesses!

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          • #6
            Re: Bad Missfire and VagCom wot connect?

            I have aftermarket decks in both of mine, never had a problem

            We did run the test cable thing... showed up just fine

            Pretty sure your deck was off at the time, wasn't it Eric?

            Actual error that it showed on vag-com was 'could not sync to...' something..., cant quite remember, and on the screens when you run the auto scan, after a couple of seconds it usually shows a few lines of info, maybe vin number, etc, we didnt even get that - when I scanned my car, got it immediately....

            :(
            Last edited by ricosuave; 04-27-2008, 12:34 AM.
            Now: 00 2dr Golf TDI, 03 Jetta Wagon TDI, 02 2500HD Duramax
            Then: 69 SC Transporter, 84 Rabbit GTI, 87 Fox GL, 91 Golf IDI, 96 Passat Wagon TDI, 97 Jetta IDI
            "Everything I save by driving diesel I put back due to poor German engineering and crappy Mexican workmanship!"

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            • #7
              Re: Bad Missfire and VagCom wot connect?

              The reason this problem shows up is that if an afternarket harness adaptor is used, the blue wire in the harness is the k-wire on the the factory harness and if people hook it up it either shows - or + on the wire not allowing the Vagcom to send data through it... simple fix don't hookup the wire it is wrong anyway because it should go through the ant wire.
              Richard

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              • #8
                Re: Bad Missfire and VagCom wot connect?

                Originally posted by Dubsport Inc View Post
                The reason this problem shows up is that if an afternarket harness adaptor is used, the blue wire in the harness is the k-wire on the the factory harness and if people hook it up it either shows - or + on the wire not allowing the Vagcom to send data through it... simple fix don't hookup the wire it is wrong anyway because it should go through the ant wire.
                Richard
                thats good thanks,
                so, should the blue wire just be disconnected or connected to the antenna wire then because that blue as well right?

                cant remember if the deck was off or just turned down Rick.

                Cheers
                Last edited by Kordain; 04-27-2008, 11:22 PM.
                Eric..

                Nobody knows everything, but everybody knows something you don't!

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                • #9
                  Re: Bad Missfire and VagCom wot connect?

                  Disconnected All Together. Car Is Still Looking For The Stock Radio Basically. You'll Always Always Get Stereo Faults When Scanning, No Biggy
                  1) 2007 Candy white MKV GTI. DSG, votex kit, 19" Privat netz, tinted tails, smoked side markers & mirror signals, 20% tint, TT stubby, APR sport 3" turbo back exhaust, ABD stage 2 cold air intake. GONE.
                  2) 1993 Green Corrado VR6. ABD intake. FK Silverline coils, Zimmerman cross drilled & slotted rotors. GONE.

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                  • #10
                    Re: Bad Missfire and VagCom wot connect?

                    Thanks Jeremy
                    Eric..

                    Nobody knows everything, but everybody knows something you don't!

                    Comment

                    • #11
                      Re: Bad Missfire and VagCom wot connect?

                      Originally posted by Dubsport Inc View Post
                      The reason this problem shows up is that if an afternarket harness adaptor is used, the blue wire in the harness is the k-wire on the the factory harness and if people hook it up it either shows - or + on the wire not allowing the Vagcom to send data through it... simple fix don't hookup the wire it is wrong anyway because it should go through the ant wire.
                      Richard
                      check the wiring diagram again because some of those harness's loop and the plug still has to be disconnected after the radio is removed.Good Call.

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