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Thread: R36 BWS, random high idle RPM, system lean

  1. #1
    Join Date
    Aug 2023
    Location
    NORTH RYDE NSW
    Posts
    6
    Users Country Flag

    R36 BWS, random high idle RPM, system lean

    As title suggests, the car is randomly at about 1100 RPM at a stop for a few secs, then goes back to 7-800 RPM.

    I have looked at RossTech however would be great if any owner can shed some lights, as I am not sure whether this is a Low Pressure/High pressure fuel sensor issue or a rear main seal issue(which is leaking a bit but not horrible)

    I have used VCDS and returned these logs for engine:

    Address 01: Engine (BWS) Labels: 03H-906-032-BLV.clb
    Part No SW: 03H 906 032 FS HW: 03H 906 032 AB
    Component: CC3.6-FSI-EU5 G 4855


    4 Faults Found:
    004506 - Fuel Pressure Sensor (G247)
    P119A - 001 - Malfunction - Intermittent
    Freeze Frame:
    Fault Status: 00100001
    Fault Priority: 0
    Fault Frequency: 8
    Reset counter: 255
    Mileage: 114311 km
    Time Indication: 0
    Date: 2018.03.17
    Time: 09:41:57


    Freeze Frame:
    RPM: 650 /min
    Load: 16.5 %
    Speed: 0.0 km/h
    Temperature: 65.0 C
    Temperature: 42.0 C
    Absolute Pres.: 1000.0 mbar
    Voltage: 14.097 V


    001287 - Idle Control System RPM
    P0507 - 001 - Higher than Expected. - Intermittent
    Freeze Frame:
    Fault Status: 00100001
    Fault Priority: 0
    Fault Frequency: 3
    Reset counter: 255
    Mileage: 114323 km
    Time Indication: 0
    Date: 2018.03.17
    Time: 11:57:21


    Freeze Frame:
    RPM: 1016 /min
    Load: 16.9 %
    Speed: 0.0 km/h
    Temperature: 85.0 C
    Temperature: 39.0 C
    Absolute Pres.: 1010.0 mbar
    Voltage: 13.843 V


    000372 - Fuel Trim; Bank 2
    P0174 - 004 - System Too Lean - Intermittent
    Freeze Frame:
    Fault Status: 00100100
    Fault Priority: 0
    Fault Frequency: 2
    Reset counter: 255
    Mileage: 114403 km
    Time Indication: 0
    Date: 2018.03.17
    Time: 00:06:46


    Freeze Frame:
    RPM: 643 /min
    Load: 17.2 %
    Speed: 0.0 km/h
    Temperature: 85.0 C
    Temperature: 26.0 C
    Absolute Pres.: 1000.0 mbar
    Voltage: 13.970 V


    000369 - Fuel Trim; Bank 1
    P0171 - 004 - System Too Lean - Intermittent
    Freeze Frame:
    Fault Status: 00100100
    Fault Priority: 0
    Fault Frequency: 1
    Reset counter: 255
    Mileage: 114403 km
    Time Indication: 0
    Date: 2018.03.17
    Time: 00:06:49


    Freeze Frame:
    RPM: 644 /min
    Load: 17.2 %
    Speed: 0.0 km/h
    Temperature: 85.0 C
    Temperature: 26.0 C
    Absolute Pres.: 1000.0 mbar
    Voltage: 13.843 V

  2. #2
    Join Date
    Feb 2011
    Location
    Newcastle
    Posts
    5,797
    Users Country Flag

    A hunting idle is usually an air leak somewhere. Check all your vacuum lines going to the intake as well as your airbox etc. Also the PCV's on the 3.2 and 3.6L V6's are very well known for leaking - so this is likely to be a possibility.

    RKX 3.6 3.2 L Valve Cover PCV Valve Diaphragm membrane for VW AUDI 3.6L VR6 R32 | eBay
    2017 Ford Fiesta ST
    2015 Audi SQ5 bi-turbo V6 TDI family hauler

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