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  1. Vw golf mk5 1.9 bkc overboost 
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    Hi guys
    New to the forum and need some help as im out of things to check. I have a mk5 golf 1.9 bkc and I have just fitted a new turbo and it's overboosting when revving past 3k. I have tried the map maf and n75 box off another car, adjusting the actuator to 18inhg, fixed all boost leaks. I also blocked of the vac line to the actuator so it couldn't open the vnt and made no difference. Any help would be much appreciated as its really bugging me.
     
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  2. Re: Vw golf mk5 1.9 bkc overboost 
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    Is it remapped in any way?

    Presumably it feels "limpy" if you disable the actuator. But still overboosts? What fault code are you seeing with what reader?
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  3. Re: Vw golf mk5 1.9 bkc overboost 
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    Over and under boost feel the same, I suspect you have code P0299 and possibly P0234 as well.
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  4. Re: Vw golf mk5 1.9 bkc overboost 
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    60% of defects on vehicles is down to wiring 0r faulty fuse boxes or components not being energised by the ecu switched earth. In your case i would first check out turbo pressure control solenoid which is earthed at ecu b29 switched wire colour blue/black
     
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  5. Re: Vw golf mk5 1.9 bkc overboost 
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    Quote Originally Posted by VAG-Abound View Post
    Is it remapped in any way?

    Presumably it feels "limpy" if you disable the actuator. But still overboosts? What fault code are you seeing with what reader?
    No for some reason it feels the same when disconnected and ye still overboosts. I'm getting code p0234.
     
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  6. Re: Vw golf mk5 1.9 bkc overboost 
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    Iv only got the code p0234.
     
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  7. Re: Vw golf mk5 1.9 bkc overboost 
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    Quote Originally Posted by Crasher View Post
    Over and under boost feel the same, I suspect you have code P0299 and possibly P0234 as well.
    Iv only got the code p0234.
     
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  8. Re: Vw golf mk5 1.9 bkc overboost 
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    Quote Originally Posted by mickeybo View Post
    60% of defects on vehicles is down to wiring 0r faulty fuse boxes or components not being energised by the ecu switched earth. In your case i would first check out turbo pressure control solenoid which is earthed at ecu b29 switched wire colour blue/black
    Iv cleaned all the earths that are under the fuse box, would it not come up as a code if there was a problem with the wiring?
     
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  9. Re: Vw golf mk5 1.9 bkc overboost 
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    Where was the new turbo from?

    Over boosting with actuator disconnected would suggest VNT vanes stuck or actuator low limit too high - or sensor failure. Adjusting the actuator may have take it out of range. Can you log the requested and actual boost to see if there is some change?
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  10. Re: Vw golf mk5 1.9 bkc overboost 
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    Quote Originally Posted by VAG-Abound View Post
    Where was the new turbo from?

    Over boosting with actuator disconnected would suggest VNT vanes stuck or actuator low limit too high - or sensor failure. Adjusting the actuator may have take it out of range. Can you log the requested and actual boost to see if there is some change?
    I got the turbo from a company off ebay. I did do some live data logging and it's showing that the actual boost is alot higher than the specified. I logged it before and after altering the actuator and it hit the same amount of boost when it went into limp mode. Is there a way to upload pics on here as I have some on my phone of the logs.
     
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