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extremely high idle on 96 supercharged EFI

Discussion in 'Subaru Sambar' started by DOUGNASH, Sep 20, 2023.


    DOUGNASH Member

    Hi everyone

    I'm a new owner of a 96 Kv4 DIAS II van in NY

    It idles extremely high around 1500-1800 rpms.

    It just came over from Japan with 69,000 km

    I have worked on diesels before but never these small gas engines.

    Any advice on where to start ?

  2. OhDeer

    OhDeer Active Member Supporting Member

    If it hasn't been done already, I'd replace all of the vacuum lines. A leak will cause all kinds of issues, it's super cheap, and you will have a nice base state.
    DOUGNASH likes this.
  3. rkrenicki

    rkrenicki Active Member

    Is this a supercharged Dias? If so, the two rubber couplers for the supercharger have probably cracked with age letting in unmetered air. You can replace them with some 48mm silicone joiners that are cut down to length.
    DOUGNASH likes this.

    DOUGNASH Member

    Thank you, I ordered a roll of new 3mm ID silicone tubing

    DOUGNASH Member

    Yes this is a supercharged Dias

    I ordered two new couplers

    Thank you
  6. udidwht

    udidwht Member

    You'll need to remove the supercharge duct to replace both the couplings. Not a difficult job. The gasket between the supercharge and head is reusable. Prior to replacing it carefully clean it with acetone and then smear a thin coat of Hylomar blue on each side prior to install and re-torque.

    DOUGNASH Member

    Turns out the distributor was off a few degrees, idles nice now after adjusting

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