Question about BMW 550

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I have a 08 550i Great car except bad hesitation when gas pedal is push down half way at all speeds. seems to die then hunts for lower gear then takes off like a bad turbo lag Very annoying Rob

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  • mcmenos Jan 05, 2011

    Hi there The check engine light is not on. It,s a drive by wire car and I'm wondering if it needs a software up date or default. The problem has been showed to local BMW dealer but service manager tells me to switch trans to sport mode to up rpms by thousand or so. Though a bit better the hesitation is still present. Is this normal on these cars or is mine the exception. My previous car was a '03 540 which had instant throttle response Not getting much response from dealer either.

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Hello Rob.

Is the check engine light on?
There must be a sensor not reading correctly.
You will likely need to have it hooked up to a scanner capable of reading the data from the various sensors to find out which one is causing the hesitation.
Mass airflow, throttle position and accelerator pedal position are the first ones I would be suspicious of. While there could be other sensors involved these affect fuel/air ratio control more than others.

Cars have become essentially computer controlled with inputs from the driver and difficult to diagnose without the proper equipment.
This situation will be very difficult to assist you without this information.
I would like to have had a more definitive answer for you.
Thank you for using FixYa.

KL

Posted on Jan 04, 2011

  • FUBAR Jan 05, 2011

    Hello Rob....I checked for any possible service bulletins concerning your BMW but nothing apparent. There were a couple on fuel injector cleaning but not likely your issue.......
    I'm disappointed by the response of the dealer to you. It's only a couple years old, you would think that they would be willing to get your vehicle running well.
    ..I also checked on some forums on the problem but nothing was available that I could find.
    As I had suggested previously the inputs to the computer should be scanned to find out what sensor isn't responding the way it should. One is not doing it's job but not out of range enough to set a code.................

    KL

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