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    Thread: Car idles at 1500 no matter what I do.

    1. Member LO-vw's Avatar
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      mk6 Diesel tampon
      09-30-2012 09:14 PM #1
      I can play with the idle screw and kill it and open it up and somehow it will still find a way to idle at 1500.
      It will creep up but eventually it idles at that speed.

      Any ideas? Im guessing the car is now in open loop.

      Car ran and drove great, then I did a hard launch and its been idling high.
      FS: Happich Replacement seals

      **WTB: G60 or lysholm chargers** **WTB:mk6 TDI Turbo upgrade** **WTB: mk6 power folding mirrors**

    2. Member Prof315's Avatar
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      1992 Corrado ABA-T and MS3-Pro powered, 84 Honda V65 Sabre
      10-01-2012 07:07 AM #2
      Quote Originally Posted by LO-vw View Post
      I can play with the idle screw and kill it and open it up and somehow it will still find a way to idle at 1500.
      It will creep up but eventually it idles at that speed.

      Any ideas? Im guessing the car is now in open loop.

      Car ran and drove great, then I did a hard launch and its been idling high.
      Sounds more like a vacuum leak to me
      The Professor
      Melbourne, FL
      92 Corrado OBD2 ABA-T (BW EFR 6258) Powered by MS3Pro
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    3. Junior Member
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      1990 Corrado G60
      10-01-2012 02:34 PM #3
      What sucks is WHICH vacuum line is the problem, because there's too many.
      but, I'm sure if I had some time, I'd get the soapy water in a spray bottle and get to work!
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    4. Member weejunGL's Avatar
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      10-01-2012 02:54 PM #4
      check that small hose that connets the ISV to the intake manifold ,that one cracked on mine once. and i got high idle due to that

      i've never seen 1500rpm out of a small vacuum hose break before, it has to be bigger then 3.5mm inner dia for that

    5. 10-02-2012 05:09 PM #5
      Or check the two behind the throttle body.

    6. Member LO-vw's Avatar
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      mk6 Diesel tampon
      10-02-2012 08:36 PM #6
      I can pinch the line to the ECU and the car dies.
      I pinch any other line and nothing happens.
      FS: Happich Replacement seals

      **WTB: G60 or lysholm chargers** **WTB:mk6 TDI Turbo upgrade** **WTB: mk6 power folding mirrors**

    7. 10-03-2012 03:59 PM #7
      Disconnect the ISV and plug back in.

    8. Member
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      10-03-2012 07:23 PM #8
      Do not disconnect the ISV valve while running. Only disconnect and re-connect with the ignition off.

    9. Member crazynorweegian's Avatar
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      1990 Corrado 1.9L G60-ST5 Black, 01 stage 3 allroad 6MT
      10-06-2012 03:13 AM #9
      Quote Originally Posted by DigiMatrix View Post
      Do not disconnect the ISV valve while running. Only disconnect and re-connect with the ignition off.
      Or better yet, with the battery disconnected.

      I watched a mechanic do this recently. Get a vac gun (should be a free rental or max $30) and plug it into the ends of the vac lines in the bay. Draw a vac and listen for the hiss. You might have to pump pretty fast. I would say you have a blown off line. Good luck.

      Edit: Quick tip, the only line that really matters for your idle that much is the ECU line. That, and the idle screw.
      Stephen
      Portland, OR
      Black 1990 1.9L Stage 5 G60 - keeper
      Corrados decay in a way that can only be measured using quantum physics
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    10. Member
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      10-08-2012 11:30 AM #10
      Quote Originally Posted by crazynorweegian View Post
      Edit: Quick tip, the only line that really matters for your idle that much is the ECU line. That, and the idle screw.
      That or the Tee'd hose fitting between the intake, (above ISV) the throttle body and the carbon canistor. A split in this line will cause the idle to jump to 1500 RPM. Take it right off to check because it is usually on the bottom side.
      Last edited by DigiMatrix; 10-09-2012 at 12:19 AM.

    11. Member crazynorweegian's Avatar
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      10-10-2012 12:35 AM #11
      Quote Originally Posted by DigiMatrix View Post
      That or the Tee'd hose fitting between the intake, (above ISV) the throttle body and the carbon canistor. A split in this line will cause the idle to jump to 1500 RPM. Take it right off to check because it is usually on the bottom side.
      Very common.
      Stephen
      Portland, OR
      Black 1990 1.9L Stage 5 G60 - keeper
      Corrados decay in a way that can only be measured using quantum physics
      http://sites.google.com/site/corradoproject/

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