idle help

Discussion in '40- & 55-Series Tech' started by bluemax, Jul 2, 2005.

  1. bluemax

    bluemax

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    when coming to a complete stop the cruisers(70 F155) tends to idle high for a few moments
    and then comes down is this normal
    thank you

    GF..
     
  2. mr_manny

    mr_manny

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    I would guess one of the following:
    carburetor float-level
    fuel pressure...do you have the stock mechanical fuel pump?
    brake booster vacuum leak...try stepping on the brakes in the drive-way, and see if your idle changes.
     
  3. Pin_Head

    Pin_Head

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    If you have a later model carb with smog control and a "throttle positioner" then this is normal operation. I'm not sure when this feature appeared, but I'm guessing '73 or 74. If you don't have a carb with a TP, then I would check the linkage for binding.
     
  4. bluemax

    bluemax

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    it's a 1970 fj40 with single MC. the carb looks to have been changed or rebuilt
    [​IMG]

    [​IMG]
     
  5. FJ40Jim

    FJ40Jim The Cruiser Whisperer SILVER Star

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    Yes, it appears in your photos that the carb & emissions are still box stock. The computer tells the throttle positioner to hold the throttle on high-idle when coasting to a stop. It should drop back to idle when the vehicle stops. If the idle is staying up for more than a few seconds after coming to a stop, then there is a problem.
     
  6. Pin_Head

    Pin_Head

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    You appear to have a cable throttle, which tend to stick more than other types. If it is not the throttle positioner, try lubing the cable with "Dry Slide" (A graphite based cable lubricant available at motorcycle shops) or get a bigger return spring.
     
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