BMW 330D losing power intermittently

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  1. BMW 330D losing power intermittently 
    #1
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    beemer111's Car Details
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    330D 2003
    Drives lovely but every so often when I take my foot off the excellerator it loses power.
    Turn it off and start again and it is ok.
    My mate has tried to check the diagnostics but can`t find any info.
     
     

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    #2
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    Aristotle25's Car Details
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    Sounds like faulty MAF sensor. Sometimes they don't log errors into the diagnostics until they are fully failing.

    Or potentially fuel issue, fuel pump and fuel filter all ok?
     
     

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    matthew_henson's Car Details
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    Quote Originally Posted by Aristotle25 View Post
    Sounds like faulty MAF sensor
    More likley to be MAP sensor, failed MAF tends to flatten the power across the rev range and the engine idles badly. MAP sensors give all sorts of funny flat spots when the block up or fail.

    Is yours a vacuum or electronic trubo actuator? they changed over in 2003 and you sometimes get intermittent power loss from the early electronic ones when the get hot
     
     

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    #4
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    beemer111's Car Details
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    The car runs perfectly well otherwise.
     
     

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    #5
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    beemer111's Car Details
    Model of Car:
    525se
    Year of Manufacture:
    2002
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    I`m assuming it is the earlier one, the car is an 03 reg.
    Are the actuators a big job, likely to be expensive ?
     
     

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