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Thread: Help with high idle

  1. #1
    Join Date
    Jun 2013
    Location
    miami, florida
    Posts
    42
    My Cars
    968 LS1, 190e 2.3-16

    Help with high idle

    Have high idle condition in a M88, Here is what I've done so far:

    Engine is newly rebuilt
    New o rings in metering needles
    New o rings in bypass screw
    Fully flowed injectors with new o rings
    Adjusted bypass, throttle blades, bypass screw per manual
    Slide valve works well. fully closed at working temp (an still high idle). caped bypass hose and has no effect.
    new plenum/intake horn couplers with new clamps
    New TPS and it is adjusted properly (click at idle position)and corroborated by terminal ohm readings.
    idle stop screws have throttle blades closed on all cylinders.
    throttle mechanism push rods are adjusted as per manual.
    all gaskets are new, all hoses are new.
    Bypass screw makes very little effect, even when all the way in. At factory spec, rpms are within 50 of full closed reading.

    Ideas are welcome

    TIA

    Jpr

  2. #2
    Join Date
    Jan 2018
    Location
    orange county
    Posts
    29
    My Cars
    1970 2800CS
    This may help...or maybe not, now that I read the complete post

    http://mantismanometers.bigcartel.co...djustment-tool
    Last edited by CSGuy; 02-13-2018 at 02:21 PM.

  3. #3
    Join Date
    Jul 2008
    Location
    Socal
    Posts
    3,441
    My Cars
    Euro 81 628csi. 02 325i
    I do know that ECU plays a role in Idle, as I currently have a euro ECU which has resulted in a higher idle, I also have a spare US spec ECU which allowed the car to idle at a lower RPM.
    So maybe try swapping the ECU?

  4. #4
    Join Date
    Feb 2003
    Location
    North Central Florida
    Posts
    1,282
    My Cars
    88m5,2015 Silverado
    Simple and I'm sure you have checked it. Hose from dipstick tube to plenum ? Make sure the air flows freely, that small hole in the dipstick tube is VERY small

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