Pug 306 Lambda system control problem

Discussion in 'Peugeot 306' started by Cookacat, Jul 14, 2004.

  1. Cookacat

    Cookacat Guest

    I recently used a gunsons unit to flash the fault code from my PUG 306 2.0
    XSi 1997 reg. Basically it stalls when starting from cold. I thought it was
    something to do with lambda sensor. The gunsons unit gave me code 52 which
    in it's code book means the car has a fault with the Lambda system control.

    Now is this something I can fix myself? I.e. put in a new lambda sensor or
    lambda system control or is this a garage job? I'm pretty handy with the
    car, not the best but I can muddle through. The Haynes manual I've got isn't
    much use with this problem.
     
    Cookacat, Jul 14, 2004
    #1
  2. Cookacat

    Guest Guest

    Basically 1) the lambda sensor doesnt have sufficient control of the
    fuelling to cause a stall (i.e. enough of a rich or lean condition)- it only
    affects fuel trim within a +/- 15% range, and 2) the lambda sensor will not
    be heated sufficiently to produce a realistic signal until ~ at least 5 mins
    from cold start. In anycase the ECU will disregard the o2 sensor signal
    until a certain coolant temp and run time from startup have occured, and run
    in open loop mode, deriving the fuelling purely from the stored map +
    compensation from CTS and ATS + a small amount of trim from what its
    adaptive memory.

    So, although you may have a fault with the lambda sensor system which needs
    checking out and rectifying, it won't be causing your stalling when starting
    from cold. More likely its overfuelling from either an oil filled MAP sensor
    hose, or CTS fault, or along those lines...

    Tim..
     
    Guest, Jul 14, 2004
    #2
  3. Cookacat

    cookacat Guest

    A couple of weeks ago I drove up to Nottingham and back from London. I
    put some injector cleaner in the tank. For a few starts it didn't
    stall from cold, then it went back to normal, ie stalling from cold
    starts. When starting it after 5 mins of warming up it doesn't stall.
    Also I've had a look at the MAP sensor, and it seems to be ok, but two
    out of the three wires that link to it were rubbing and were bare and
    touching. I put insulating tape round these wires. Could this be the
    problem? I could look at these wires again and re-insulate them alot
    better. Many thanks for your info.
     
    cookacat, Jul 15, 2004
    #3
  4. The lambda sensor doesn't effect the mixture on a cold engine.
     
    Dave Plowman (News), Jul 15, 2004
    #4
  5. Only if they were worn through or shorting.

    Common cause of poor running while warming up is the coolant temperature
    sensor - it has a large effect on the mixture.
     
    Dave Plowman (News), Jul 15, 2004
    #5
  6. Cookacat

    Cookacat Guest

    Thanks for that but any ideas what is causing the car to stall if it isn't
    the lambda sensor?
    I can see no air leaks, and all hoses seem ok.

    Only thing I did notice and rectify was three leads coming from the MAP
    sensor. Two of the were wearing against a plastic hose clips, and were quite
    bare. I put insulating tape round the two wires. Could these need replacing?
     
    Cookacat, Jul 15, 2004
    #6
  7. It would probably be worth buying Mr Haynes Engine Management book - I'm
    not sure if the latest version covers your car exactly. but much of the
    fault finding is common to many. And cheaper than just guessing.
     
    Dave Plowman (News), Jul 15, 2004
    #7
  8. Cookacat

    Cookacat Guest

    In the past 6 weeks I have replaced the stepper motor and the engine temp
    sensor with new parts.

    I'm just trying to eliminate all diy efforts before I take it to a dreaded
    garage.
     
    Cookacat, Jul 15, 2004
    #8
  9. Cookacat

    Mindwipe Guest

    always nice to see people out there giving advice who havent the
    faintest idea what they are talking about
    dont be insulted guys most of the people i work with in the motor trade
    are exactly the same
    its why people are driven to guessing games using out of date equpment
    from the likes of gunson
     
    Mindwipe, Jul 15, 2004
    #9
  10. Cookacat

    Guy King Guest

    The message <rpEJc.275$>
    And more to the point - it's far from clear which bit he didn't like.
     
    Guy King, Jul 15, 2004
    #10
  11. Cookacat

    Cookacat Guest

    Pardon me for asking what the problem is. I thought this was a forum for
    asking other people's advice. If you cannot help, please don't patronise.
     
    Cookacat, Jul 16, 2004
    #11
  12. Ahh - but he works in the trade. This automatically means he knows what
    he's talking about.
     
    Dave Plowman (News), Jul 16, 2004
    #12
  13. Cookacat

    Guy King Guest

    The message <>
    And doesn't need to explain to us - just sneer and suck air through his teeth.

    What is it the last few weeks - we've had a flood of these people.
     
    Guy King, Jul 16, 2004
    #13
  14. Yup. They have to gain credibility by explaining properly problems that
    defeat others before doing that with justification.

    But of course it's easier just to try and appear clever.

    I notice our AC 'expert' from across the pond who didn't know the
    correlation between BTUs and watts seems to be a bit quiet...
     
    Dave Plowman (News), Jul 16, 2004
    #14
  15. Cookacat

    cookacat Guest

    Thanks for your help guys. I'm gonna bite the bullet and take it to a
    garage. it needs a service, and hopefully that may sort out the
    problem in turn.
     
    cookacat, Jul 16, 2004
    #15
  16. Cookacat

    miner.- Guest


    the 206 suffers from a fairly common cold start routine problem
    and as of yet there's no guaranteed fix

    good luck with it

    miner.-
     
    miner.-, Jul 17, 2004
    #16
  17. Cookacat

    Mindwipe Guest

    but the point is still valid the dealer has the equipment needed and you
    could easily spend a fortune fitting unneeded parts
    just because a fault on someone elses car needed a certain part to cure it
    doesnt really mean you need the same part
    if in doubt at least buy a wiring schematic and check the systenm
    yourself for wiring faults
    but to just keep fitting parts is a waste of money
     
    Mindwipe, Jul 17, 2004
    #17
  18. Cookacat

    Mindwipe Guest

    i'm not sneering ,,,,,,,,,,the car needs to go to the dealer
    gunsons equipment is shite
    thats it
     
    Mindwipe, Jul 17, 2004
    #18
  19. Cookacat

    Guy King Guest

    The message <40f98c67$0$6446$>
    Are you saying that what his reader says is a fault 54 (or whatever it
    was) isn't a fault 54? While their analogue stuff might be somewhat
    flakey they'd be hard pushed to design a code reader which returns the
    wrong codes.
     
    Guy King, Jul 17, 2004
    #19
  20. Similar advice was given earlier in the thread.
     
    Dave Plowman (News), Jul 17, 2004
    #20
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