2002 955i Issue I've Made.....

Discussion in 'Technical Help' started by BlisterMan, Apr 7, 2025.

  1. BlisterMan

    BlisterMan New Member

    Feb 22, 2025
    0
    1
    UK
    #1 BlisterMan, Apr 7, 2025
    Hi guys

    2002 Speed Triple 955i - UK....

    I've just replaced the pipes that go from the IACV to the throttle body with 1/4 silicon vacuum hose, as the old ones were perished and split.


    [​IMG]

    Just reassembled everything, starts OK, and will idle, but when I blip the throttle, the revs drop and it cuts out. I can hold the throttle open at say 2k - 3k RPM, but let go, and cuts out.

    I guess I've done something to the IACV - any suggestions? (I did not knowingly change anything, just connected the new pipes).
    Thanks.
     
    • Useful Useful x 1
  2. joe mc donald

    joe mc donald Joe
    Subscriber

    Dec 26, 2014
    15,014
    1,000
    slough / burnham
    #2 joe mc donald, Apr 7, 2025
    @BlisterMan Welcome to the family. You may need a tune or remap to let the bike know it has something but it should pick up on its own. Also check for air leaks and fitting.
     
    • Agree Agree x 1
  3. TRIPLE X

    TRIPLE X Senior Member

    Sep 1, 2021
    536
    243
    Norfolk
    #3 TRIPLE X, Apr 7, 2025
    To gain access you will have removed the airbox and disconnected the MAP sensor which is attached to the airbox. The MAP sensor has a rubber hose attached to it's underside as well as an electrical connector. If removed have both been reconnected?
     
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  4. blacktiger

    blacktiger Active Member

    May 14, 2023
    42
    28
    St. Leonards on sea
    #4 blacktiger, Apr 14, 2025
    Quite possibly the rubber gasket that goes around the IACV was dislodged when you put the airbox back on. It's too easy to do. I used a few small spots of Blacktac around it to hold it in place before putting the airbox on.
     
    • Useful Useful x 1
  5. BlisterMan

    BlisterMan New Member

    Feb 22, 2025
    0
    1
    UK
    #5 BlisterMan, Apr 14, 2025
    Cheers for suggestions, I think I've covered all pipes to airbox, and all electrical connections. I've just taken it all apart again, and tried the check of the IACV stepper motor, and that seems to be doing what its supposed to. Checked seal on top of IACV. I bought an OBD cable and copy of TuneECU, but I'm struggling to see how to do a reset of the ECU, as it seems likely it needs to be reset after replacing pipes. Any advice there?
    Thanks.
     
  6. BlisterMan

    BlisterMan New Member

    Feb 22, 2025
    0
    1
    UK
    #6 BlisterMan, Apr 14, 2025
    Also - Anybody think I would get a different result from fitting original replacement pipes I have since purchased, instead of the silicon hoses?
     
  7. TRIPLE X

    TRIPLE X Senior Member

    Sep 1, 2021
    536
    243
    Norfolk
    #7 TRIPLE X, Apr 15, 2025
    Wouldn't have thought so, as long as they are the same bore size and length?
     
  8. blacktiger

    blacktiger Active Member

    May 14, 2023
    42
    28
    St. Leonards on sea
    #8 blacktiger, Apr 15, 2025
    On TuneECU there should be a box to tick to reset Adaptions. If not, do the 12 minute reset tune.
     
  9. blacktiger

    blacktiger Active Member

    May 14, 2023
    42
    28
    St. Leonards on sea
    #9 blacktiger, Apr 15, 2025
    Only if your new tubes are colapsing under the vacuum. I believe that's why the originals are rippled/corrugated to hold them open.
     
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