8v high idle

Discussion in '8-valve' started by eddiedebo, Apr 23, 2019.

  1. eddiedebo New Member

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    Hi

    I've tried to follow rubjonny setup for digifant timing and idle however when i set the idle and plug the blue sensor in again the idle shoots back up to 11-1200rpm.

    I have tried the procedure multiple times and every time is the same.

    It's a brand new genuine blue sensor.

    Any ideas?

    Thanks

    Andy
     
    Last edited: Apr 23, 2019
  2. rubjonny

    rubjonny Administrator Admin

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    did you check the idle switch is working as per my guide, plus checked the ignition timing?
     
  3. eddiedebo New Member

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    I've set the ignition timing with a timing light at 2250rpm with the blue sensor unplugged. Plug the sensor in and it advances the timing as it should.

    I may have missed the bit about the idle switch...what do I need to do?

    I've just read it again and I had not bunged the vacuum line to the UFO. Could it be a vacuum leak?

    Thanks
     
  4. rubjonny

    rubjonny Administrator Admin

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    make sure the idle switch clicks as the throttle is closed, to check it electrically you use a multimeter on the 2 pin plug round the back it should read closed circuit with the throttle closed, go open circuit when opened, and closed circuit again when throttle is wide open. to make sure the wiring from the plug to the ecu is good if you hold the throttle just off idle and press the full throttle switch on the top the revs should drop back to idle rpm.

    with the breather pipe you will need to block the side which goes to the inlet otherwise you have a massive air leak. the connection from the breather valve itself needs to be left open though. This is only needed when adjusting the CO% though and the oil is heavily contaminated as the block gasses will affect the readings. If oil is clean and/or just setting the idle you can leave the breather pipework alone.

    Worth checking the inlet pipe work all over for air leaks, the breather bung is a good one plus a few more tips in my guide
     

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