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#11
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![]() At Clavurion has mentioned - you need to check that the VGT vanes are being operated - your issue has all the hall-marks of the VGT actuator not operating correctly. There are many possible causes for this and the very first and most basic diagnostic step is to ensure that the actuator is moving the turbo vanes at start-up. Further diagnosis beyond this gets more complicated but let's get this first step out of the way and then proceed from there. Here's a video of the M47 (4-cylinder version of the 6-cylinder M57) VGT actuator in action: - https://www.youtube.com/watch?v=W3zOrUHxhFg
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) ![]() |
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#12
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PS anyone I speak to (colleagues etc) the minute I explain issue they say its the turbo....well yes it aint spooling up before 2000rpm, but as I have read in the posts it could be quite a few reasons.....no necessarly and issue with turbo kicking my slef for no insisting mechanic delved into further and even preemptively change out the pressure converter whilst he was down there....
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E53 X5 3.0d SUV prod.date 11/2004 eng.variant M57N Europe Right hand drive N Last edited by omodos; 05-03-2022 at 01:49 AM. |
#13
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You linked it to the incorrect pressure converter - you have indicated the EGR pressure converter. The turbo control pressure converter is here: - https://www.realoem.com/bmw/enUS/sho...diagId=11_2978 Same part and part number though. ![]() I wouldn't replace this on spec unless diagnosis shows it to be faulty (which it may be...).
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) ![]() |
#14
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E53 X5 3.0d SUV prod.date 11/2004 eng.variant M57N Europe Right hand drive N Last edited by omodos; 05-03-2022 at 02:06 AM. |
#15
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Yeah, there is a small filter on the pressure converter and I guess it could be blocked by the exhaust soot - not 100% sure how this would affect it's operation but I guess it could well be compromised by a dirty filter - internet "evidence" suggests this is the case.
Slightly different pressure converter model but you can see the filter, second item from left. ![]() (Image from this thread - which is interesting... https://www.e90post.com/forums/showthread.php?t=1589166 The vacuum reserviour is simply to provide a near-constant vacuum "pressure" (negative pressure) for the pressure converter to work with, since it opens and closes very rapidly to modulate the VGT actuator position. Without this reservoir, the pressure converter is working with a vaiable vacuum level, meaning the VGT operation is dependant on vacuum level (via RPM).
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) ![]() |
#16
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okay matey yes, right so not noticing any improvement when the accumulator reservoir is bypassed means what? the accumulator could still be duff? whipping it off blocking one end and blowing through on the other end when submersed in water to see if it has bubbles coming out of it to see if it is leaking is a good test
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E53 X5 3.0d SUV prod.date 11/2004 eng.variant M57N Europe Right hand drive N Last edited by omodos; 05-03-2022 at 04:56 AM. |
#17
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First, check the VGT actuator operates as it's supposed to. Then you could check the vacuum reserviour (and the closed pressure converter) with a vacuum gauge, like in my write-up. If those tests come up good, you might want to then remove and test the pressure converter. Or, as you suggest, simply replace it, since in your case the labour costs will likely exceed the cost of the part.
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) ![]() |
#18
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E53 X5 3.0d SUV prod.date 11/2004 eng.variant M57N Europe Right hand drive N |
#19
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Not sure I can feel boost at 1,500rpm but I can certainly hear the turbo spooling up by then. Which doesnt mean it's creating significant boost at that low rpm - but perhaps my pressure converter is getting pretty tired too!! ;-)
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) ![]() |
#20
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Haahahaha ok true, as for the laboour costs, yes cost an arm and a leg to get the manifold done....are these pressure coverters/actuators (those with the same part number) just as a pain to do as the manifold? ie the EGR one and the one nearest the turbo that activates the plunger to open the vanes?
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E53 X5 3.0d SUV prod.date 11/2004 eng.variant M57N Europe Right hand drive N |
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