BX16v Idle issue
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  1. #1
    twm
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    Default BX16v Idle issue

    Hey guys

    Just aquired a 16vbx 89, the idle wanders up and down sometimes by is consistantly high around 2000rpm, if you start without accelerator is seems out but as soon as any throttle up it goes again, I was just sittitng wtching it and it went from 1000 to 3000 back to 1500 then to 2000, seems like a vacume leak or something.

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    Any ideas, have had a chance to have a good look yet

  2. #2
    1000+ Posts Dave's Avatar
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    Sounds like a wacky idle stepper motor. Have you read any fault codes from the ecu?

    Dave


  3. #3
    twm
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    Quote Originally Posted by Dave
    Sounds like a wacky idle stepper motor. Have you read any fault codes from the ecu?

    Dave
    No but have a code reader on the way, I suppose this is what you mean.

    I believe there is a switch that is activated at idle as well, I iwll check that out tomorrow in daylight.

    How do you check the steeper motor ?


  4. #4
    twm
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    Quote Originally Posted by Dave
    Sounds like a wacky idle stepper motor. Have you read any fault codes from the ecu?

    Dave
    I fixed it

    It seems that the idle swith/throttle posistion sensor was not quite right/ It was interesting since when releasing the throttle very slowly at the the throttle body by hand with the engine off, I could hear the micro swith (well it sounds like a micro switch??) cut in (click). Doing the same with the engine running resulted in a 2000rpm idle. A quick flick of the throttle would not make any difference, however a very gentle push on the throttle (at the throttle body) would correct it.

    Weird ehh ????

    Any way I adjust the switch/sensor all beit by about a thou and all is well

    One for the records.

    now for the mysterious water loss ................


    Terry

  5. #5
    Moderator Alan S's Avatar
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    Quote Originally Posted by twm

    now for the mysterious water loss ................


    Terry

    Start here:-

    Citroen BX16V/Mi16 A disaster waiting to happen; have you got one?


    Alan S
    If it ain't broke, use a 12" shifter.....that usually does the trick!!

  6. #6
    twm
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    Quote Originally Posted by Alan S
    Thanks Alan

    Great advice

    Someone told me you are the bx16v King is that true ?


    Terry

  7. #7
    1000+ Posts PeterT's Avatar
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    That TPS setting is quite critical. There are three positions - idle, part throttle and WOT. You can check them easily with a multimeter. The idle position often fails completely, leaving you idling at 2000 rpm.

    You don't need a TAD tester to extract the codes. Just a switch and some wire. I posted the procedure and fault codes in the Technical section. Utilising the codes makes fault finding very easy on these engines.

    ECU Fault Codes
    Last edited by PeterT; 14th July 2005 at 11:02 AM.

    '92 205 Mi16
    '90 Mi16x4

  8. #8
    Moderator Alan S's Avatar
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    Quote Originally Posted by twm
    Thanks Alan

    Great advice

    Someone told me you are the bx16v King is that true ?


    Terry
    Wouldn't exactly say that; then again the term "Queen" doesn't rest easy either..

    Nah, just someone who has owned one that was the victim of some pretty ordinary servicing in its earlier life and who lives in an area where I have been asked if Citroens were a model of Nissan. So most of what I've learned has been through experience and a lot of it by trial and error or common sense.


    Alan S
    If it ain't broke, use a 12" shifter.....that usually does the trick!!

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