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355 High idle solved

Discussion in '348/355' started by F355Bob, Aug 29, 2019.

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  1. F355Bob

    F355Bob Formula 3

    Nov 4, 2003
    2,001
    Madison, Wisconsin
    #1 F355Bob, Aug 29, 2019
    for a few months my car idle,would creep up from 1000 rpm to 1500 rpm. I cleaned both idle valves and checked the linkage. Still the idle would go to 15oo rpm. After I replaced my alternator and replaced a broken alternator wire, my idle is now a steady 1000rpm. The IAC valve was not getting the correct voltage so it did not work correctly. Always amazed how important that everything is getting the correct voltage.
     
    Qavion and Natkingcolebasket69 like this.
  2. Ferrarium

    Ferrarium F1 Veteran
    Sponsor Rossa Subscribed

    Jul 28, 2018
    5,728
    Central NJ
    Full Name:
    Eric
    #2 Ferrarium, Aug 29, 2019
    I just added 2 new ground wires because of this fear of electrical grounding issues and wire brushed original ground locations. Thanks for sharing reminding!
     
  3. Qavion

    Qavion F1 World Champ
    Silver Subscribed

    Feb 20, 2015
    14,268
    Sydney
    Full Name:
    Ian Riddell
    #3 Qavion, Aug 29, 2019
    How sure are you it was the valve and not some other component getting the wrong voltage?

    Does the IAC operate with straight DC or a square wave with a differing duty cycles? The manual doesn't specify.
     
  4. F355Bob

    F355Bob Formula 3

    Nov 4, 2003
    2,001
    Madison, Wisconsin
    #4 F355Bob, Aug 29, 2019
    Just assumed it was IAC not controlling idle. Seems likely. Water temp sensor to ecu or TPS is posssible also I suppose
     

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