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Thread: E34 535i Diagnostics

  1. #1
    Join Date
    Feb 2008
    Location
    Sydney, Australia
    Posts
    4

    Default E34 535i Diagnostics

    Hi guys

    Recently I acquired an E34 535i '91 model with about 128,00 kms. Immaculate, well looked after and runs like a dream ***but***

    I've noticed very occasionally that at lower revs and idle (say as I've slowed right down and about to stop when pulling up at a red light).

    It will seem to start idling too low, with the car (assuming throttle control - methinks from memory this car/engine has one) trying to rev a little so it doesn't stall. Once I'm driving normally or opening her up all is good.

    This leads me to think it may be one of the following, but am interested to see what u dem expertsd out in der teknical lands thinks (trying to mimic Cletus the slack jaw yokel ):

    Simple stuff that might be worth checking/replacing??

    Fuel filter or even fuel pump

    What I think is more likely:

    AFM (wanting to get it replaced with a MAF and corresponding chip soon anyhoo).

    Computer/software (I'm assuming that replacing the chip will fix this if it is indeed a computer problem, unless the issue is more terminal?)

    O2 sensor or even temp sesnor (I believe if one of either is out or playing up the car will run like crap) or wiring of.


    What I would like to do is get a code reader (and am wondering where I can get one, approx $$$ ertc) so I can see exactly what the OBC is saying and try some simple troubleshooting myself first (I have a service reset tool but it only resets, can't read codes or anything).

    Any help or suggestions would be greatly appreciated.

    Thx,

    Matt.
    Co-driver, Will Iams racing.

    '91 BMW E34 535i Exec

    "Failure is not an option, it comes bundled with Windows"

  2. #2
    Join Date
    Jan 2008
    Posts
    59

    Default

    Could be simpler than you think....A very dirty air filter causes exactly the symptoms you speak of. Can't hurt to check.

  3. #3
    Join Date
    Feb 2008
    Location
    Sydney, Australia
    Posts
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    Default

    Quote Originally Posted by pcross
    Could be simpler than you think....A very dirty air filter causes exactly the symptoms you speak of. Can't hurt to check.
    Hi pcross

    That sounds like a very good idea, will do so tonight "

    Thanks very much for your help mate. :thumbs

    Cheers,

    Matt.
    Co-driver, Will Iams racing.

    '91 BMW E34 535i Exec

    "Failure is not an option, it comes bundled with Windows"

  4. #4
    Join Date
    Aug 2004
    Posts
    162

    Default Check and clean the ICV as well

    Hi,

    Assuming the car has an idle control valve, pull it out and give it a thorough cleaning. If you have the M30 engine, that's a distinct possibility.

    Regards,
    Adnan

  5. #5
    Join Date
    Feb 2006
    Location
    Seattle, Wa
    Posts
    290

    Default

    See Stumbles at Idle
    and Idle Control Valve?

    Somehow I posted the above to wrong thread last night.

    Good Luck

    Jim

  6. #6
    Join Date
    Dec 2005
    Location
    Brisbane Australia
    Posts
    1,447

    Default

    JMI that pulse sensor you're talking about in that thread of yours, is that just the Cam Angle sensor?

    Germans: Why can't they make everything?

  7. #7
    Join Date
    Feb 2006
    Location
    Seattle, Wa
    Posts
    290

    Default

    Quote Originally Posted by rob101
    JMI that pulse sensor you're talking about in that thread of yours, is that just the Cam Angle sensor?
    It determines when #6 fires so I guess it knows the cam angle.

    Jim

  8. #8
    Join Date
    Mar 2004
    Location
    NSW, Australia
    Posts
    445

    Default ICV and....

    Quote Originally Posted by mattyp
    Hi pcross

    That sounds like a very good idea, will do so tonight "

    Thanks very much for your help mate. :thumbs

    Cheers,

    Matt.
    A throttle body thats full of crap. Pull it out and give it a good clean with carby cleaner, same with ICV good luck matey!

  9. #9
    Join Date
    Feb 2008
    Location
    Sydney, Australia
    Posts
    4

    Default

    Thanks very much guys for all of your help

    I'm going to pull the carby cleaner ourt and give the ICV and throttle body a good cleaning this weekend & will let everyone know how I go next week.
    Co-driver, Will Iams racing.

    '91 BMW E34 535i Exec

    "Failure is not an option, it comes bundled with Windows"

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