E70 40d hesitant / lazy

Discussion in 'X5' started by snrbrtsn, Jun 18, 2017.

  1. snrbrtsn
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    snrbrtsn WARLORD

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    Overall car drives fine no concerns when abused it's like a scalded cat!


    However, on a sensible driving day, once up at cruising speeds 60/70mph and settled into the cruise (no cruise control in use), when light power is requested car stumbles and gives hesitance / vibration, push the pedal further to kick down point and a gear is dropped and away it pulls.
    It does not present itself in DS mode


    A possible imaginary fault though it does give concern.....

    My thoughts are mixed & looking for pointers?
    Initially thought about swirl flaps, gunked manifold etc though flaps are inactive below 2000rpm ([​IMG]) the Rev range of this troubles seems to be circa 1400-1800rpm. Is that where the first turbo spools ?

    Maf sensor fault ?
    Dpf / Egr [​IMG]

    I'll plug Carly in though don't think I'll get error codes, does that mean my thoughts are imaginary? Anyone experience similar, is it a trait of the twin turbo engine?
    [​IMG]
     
  2. JasonH
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    JasonH

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    Could be the vacuum pipes - guaranteed to fail on the 535d - I'd imagine fairly similar setup to a 40d. Just one needs to fail to mess up the operation of the turbos.
     
  3. snrbrtsn
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    snrbrtsn WARLORD

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    Thanks Jason
    In all honesty I'd overloooked vac lines on the thinking the turbo was electronically controlled
    How wrong was I, easily checked - the air filter and hosing were off recently.....
    IMG_0948.PNG
     
  4. slim_boy_fat
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    slim_boy_fat WARLORD Site Supporter

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    I very much doubt that, Sean. We tend to get attuned to our vehicle's behaviour [well, I do] and alert to anything 'out of the ordinary'. Hope you track this down easily. (y)
     
  5. kleynie
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    kleynie WARLORD Site Supporter

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    Did you get anywhere with this Sean?
     
  6. snrbrtsn
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    snrbrtsn WARLORD

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    Not really - played with the bike instead!

    I plugged Carly and c310 in, no fault codes, removed the air filter and housing to check the vac hoses and had a brief look though they all look fresh and pristine, not brittle also looked at the intercooler & pipework in case damaged / cracked, nothing untoward..
    I reset the adaptions but had no need to drive or take for a run "as yet" - shall be laid up for the next two & half weeks whilst I line the pockets on the steal island, next time home shall be put to use and checked,
    I'm reluctant to put in dealers have them read the codes and come up with the same - no fault!

    The power is not down, it still goes like the proverbial when abused, just seems lazy when bumbling!
    I'll be finishing the service with fuel and air filters soon, not that I think it'll make a difference,

    What I have noted, the sweetest Diesel engine is the 3.0d, best balance of useable torque & refinement through the legal range and suited best to the 8 speed box, the twin turbos are harsh / brash!
    Though very quick and very wanting to be abused and not fettled!

    It's possible I'm driving too gingerly..... Either a trait of age or a pre teen child in the back....
    It's also possible a change may be brewing.............
     
  7. kleynie
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    kleynie WARLORD Site Supporter

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    I agree the 3.0d is the sweet spot, I said that immediately after changing to the 3.5d
     

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