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Ford Focus 1.6 2004 - Variable vain turbo fault, code P0238 - Fixed #

Posted by Jon Otter on December 19, 2012, 2:35 pm

Year of Manufacture *: 2004
Engine Size and Code *: 1.6
( Optional ) Scanner Used: Modis
( Optional) Fault Codes: Variable vain turbos???

Seasons greetings all, Im searching for a bit of help with a fault I have on this car, fault code is the dreaded P0238 that seems to appear plenty on here with this engine.
My question is, is it possible for the variable vains to be sticking (lazy) rather than seized? The boost control is working fine, actuator rod moves freely, if vac is disconnected from actuator, boost drops away, yet when it is all connected the turbo is producing over 2.5bar boost.
With mity T'd into vac pipe & scoping pressure sensor I can see the vac dumped to atmosphere but its still generating 4.5-4.8v at the pressure sensor!
COULD it be lazy vains that are not returning to closed state (reducing pressure) or is it a case of, if the linkage is free then the vains must be moving?
Im not looking for a silver bullet here just a bit of advice as to how the link between linkage & vains actually works.
Many thanks for reading
Jon

Re: Ford focus

Posted by Dave Harney <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT2603' width='330' height='300' border=0 style='border:none;'> on December 19, 2012, 3:56 pm, in reply to "Ford focus "

Hi Jon,
This explains the workings of a peugeot variable vane turbo.

Variable vane turbo

You can trim a sheeps wool many times, but you can only fleece it once !

Re: Ford focus

Posted by Dave Emm <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT2827' width='330' height='300' border=0 style='border:none;'> on December 19, 2012, 9:59 pm, in reply to "Ford focus "
David Emm

Hello jon,the linkage moves a ring inside the turbo which in turn moves the vanes, so the linkage actually moves it both ways.Have had two cases where an overboost code was set and the vehicles in question kept going into limp mode.Tried cleaner with no luck,then dismantled turbos and found the inside to be all pock marked causing the vanes to stick.One was a rav4 (replaced turbo)the other was a golf 2.0 tdi,which I cleaned up and reassembled,that was 18 months ago and I'm still driving it around now.Not sure if something went through the engine or if a piece of blade broke off,difficult to tell as all the blades were slightly damaged, but it does'nt seem to have affected performance.

Fixed #

Posted by Jon Otter on December 20, 2012, 8:01 am, in reply to "Re: Ford focus "
Message modified by board administrator December 21, 2012, 1:02 pm

Thanks for your replies boys, Dave H thats awsome pal thanks, printed off ready to explain exactly what was happening to my customer!
Dave E, yes this one was almost exactly the same, stripped back off turbo, found a lots of carbon powder built up around vains, but also the spindles for the vains were tight (not stuck) but tight, I gave it a good clean, worked the spindles with a bit of the magic stuff, slipped it back together & hey presto Robert is my mothers brother. Happy days.
Again, thanks for your input.

Jon

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