2000 E39 530d, Turbo Actuator sticking! - Page 2

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    I do a 12 mile trip to work mostly motorway. I think the car has had an easy life and I think that could be the reason it's like this. Clearly the turbo is working I think it will need removing decoking and fixing the actuator. So wouldn't be loads of money if the turbo was off.
     
     

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    How many miles has the car done??
     
     

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    Just wondering did you ever get this sorted? My car has the same problem?
     
     

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    Quote Originally Posted by Xmak 330d View Post
    Worse case would be taking the turbo off and manually cleaning it off
    +1. And thats the worst case scenario.

    Tempermental boost, ie little then all at once can be caused by a few things, worth a fault code check just in case a pressure sensor or similar is tacky. An induction leak can produce that too from personal experience, or a leak in the vac system. Sure the hose to the turbo may be perfect, but if another vac hose is dodgy the vacuum build up can be weak, then when your rpm climbs it actuates more confidently. A healthy vac system relies on all the connections and hosework connected to the main vacuum box being good. Any leaks can cause all sorts of weird and tempermental gremlins.

    Keeping in mind the vacuum system is rpm related, the higher the rpm the greater the vacuum and greater the actuation of related components, hence the simplicity and genius behind vacuum actuation versus electronic. Could also be a dodgy/tacky pressure converter I guess.

    If it is actually sticky vanes, I'd be more inclined to use a de-coke foam. Injected just after the MAF, the foam then goes down the hose, into the turbo intake, then through the intake system, through the combustion system, and out through the turbo outlet, then out through the exhaust. I think thats pretty much the best way to clean that system. After that, I'd be inclined to just take the turbo off, or at least gain access, and do a manual clean. I have used this method on multiple cars, and even on my current BM with mixed results. Worst case scenario there is it doesn't do anything, but it won't cause any harm if used correctly.

    Heres a pic from when I de-coked my motor:



    The smoke is the foam/moisture getting processed, the grey'er the smoke the more crap is coming out, pure white smoke implies little cleaning. Don't be alarmed by the mushroom cloud the process causes
     
     

  6. Turbo cleaning 
    #15
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    Innotec is the stuff a lot of trade guys to clean the exhaust side of variable vane turbos, where the actuator stops being able to change the vane angle smoothly. You release the exhaust near to the turbo, block it up and pump a can of cleaner in, then after and hour and a bit of manual manipulation of the actuator lever, you fire a can of neutraliser in to wash out the aggresive stuff. For £40 and a bit of work its worth a try if you can get to the turbo. I've just had to do it on my VW T5 van to stop it going into linp mode and its a lot more consistent on boost now.
     
     

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