406oc.co.uk

Hi ,

So i have a 406 coupe 2003 2.2 hdi 5 speed manual , and it has an issue with the turbo vane.

Its a bit difficult to explain bur recently i was almost sure that there was some boost leak somewhere since no boost was coming under 2800 revvs.

This is what happens when variable vane is in action - https://www.youtube.com/watch?v=Hg5FJuIBGNY

After a lot of checking for boost leaks or vacuum leaks and swapped EVs , also replaced denso plus MAF sensor i saw what the problem was, and came to the conclusion that the vane that goes in and out from the turbo was stuck. As seen in the video once the vanes are set for higher revvs it gets stuck and wont go back once on low revvs.

Ps. The only way i could remove the Vane from being stuck was by taking the pipe from the EV (that goes to the turbo) and give it a boost of air from a compressor and you could totaly hear it snapping back in place.. (since the vacuum pump is not strong enough to take it back in place for low revvs) Once this is done i could say i have variable turbo again till i go over 3000 revvs ..

Came to a conclusion that there are some sludge were there is the movement of the vane itself.

Any basic solutions to this? Cleaned in place etc?

Will this effect fuel efficiency since i cannot go more than 38 mpg..

Also does this effect the output of boost even when not on low revvs?

Thanks in advance

Im sure i saw a post on the coupe forums about cleaning the turbo for this sort of reason

hucky wrote:Im sure i saw a post on the coupe forums about cleaning the turbo for this sort of reason

Can you kindly post me a link pls? Cant find any!

There are a couple of things to try...
1) Spray WD40 into the air intake ( after the MAF ) and suck on the turbo vacuum pipe that moves the pistons that actuate the vanes, simultaneously..
I need to do mine again, but I may push the boat out and do this if I can shift some old parts I have lying around..

2) Get this - http://www.ebay.co.uk/itm/5533-laser-Re ... 1c4d8caa5c
Very positive results on the Coupe forum, good results but a bit pricey for me initially

GingerMagic wrote:There are a couple of things to try...
1) Spray WD40 into the air intake ( after the MAF ) and suck on the turbo vacuum pipe that moves the pistons that actuate the vanes, simultaneously..
I need to do mine again, but I may push the boat out and do this if I can shift some old parts I have lying around..

2) Get this - http://www.ebay.co.uk/itm/5533-laser-Re ... 1c4d8caa5c
Very positive results on the Coupe forum, good results but a bit pricey for me initially

Hi gingermagic,

But spraying wd40 or the laser turbo cleaner will be enough to reach the exhaust turbine And make some effect?

I can't speak for the Revive cleaner, only the reviews are positive.

The WD40 seems to work okay, its certainly cheaper and seemed to work on mine but probably a placebo.....

GingerMagic wrote:I can't speak for the Revive cleaner, only the reviews are positive.

The WD40 seems to work okay, its certainly cheaper and seemed to work on mine but probably a placebo.....

I see.. so i just buy Wd40 and spray all of it after the maf sensor? All at one go? or should i make it in intervals ?

smbbob wrote: i just buy Wd40 and spray all of it after the maf sensor? All at one go? or should i make it in intervals ?

Holy sh*t don't do that! WD40 will burn when it reaches the cylinders and could affect the injectors etc.

Welly wrote:

smbbob wrote: i just buy Wd40 and spray all of it after the maf sensor? All at one go? or should i make it in intervals ?

Holy sh*t don't do that! WD40 will burn when it reaches the cylinders and could affect the injectors etc.

So what should i do with the WD40 part? haha

I don't know this procedure, I understand that the 'vanes' are a moving part and might benefit from a squirt of WD but unloading the whole can is asking for trouble.

Someone else who knows this trick on here should advise further.

Ha ha, no not the whole can....

If the engine is ticking over while doing this, the revs will increase as the WD40 is going through - short bursts is fine.

Welly may be right about possible ramifications, but its a trick the Vee-Dub boys do, word up.

I guess you could undo the elephant hose at the turbo end and spray into the turbine this way, while sucking/blowing on the tube, with the engine off - I'm not sure how far into the internals the WD40 will reach.

GingerMagic wrote:Ha ha, no not the whole can....

If the engine is ticking over while doing this, the revs will increase as the WD40 is going through - short bursts is fine.

Welly may be right about possible ramifications, but its a trick the Vee-Dub boys do, word up.

I guess you could undo the elephant hose at the turbo end and spray into the turbine this way, while sucking/blowing on the tube, with the engine off - I'm not sure how far into the internals the WD40 will reach.

Correct me if im talking nonsense..

So i should disconnect the elephant hose from the exhaust turbine side, spray WD 40 while sucking and blowing from the EV pipe?

Welly wrote:

smbbob wrote: i just buy Wd40 and spray all of it after the maf sensor? All at one go? or should i make it in intervals ?

Holy sh*t don't do that! WD40 will burn when it reaches the cylinders and could affect the injectors etc.

Welton,
Spraying WD40 in through the inlet pipe will NOT affect the injectors, the only way to do that would be to put it through the fuel system
Also open up the inlet tract on any diesel engine AFTER the EGR valve inlet pipe & your'll be shocked, very thick black sludge, alot more harmfull than WD40.

Right first you need to assess that the actuator is operating the variable vane & not at fault,
(but by the op's description it does sound like the turbo is sludged up)
Your best off buying a three stage cleaning kit like the one from Innotech ,
You can get it off ebay for £33.00 inc p&p it realy does what it says on the tin
As long as everything else is working this will fix your problems,
As for the WD40 method ,
I can see why it would work for a bit but it's not really worth the effort for the short term gains, like Ginger said .
Because this will not really remove the sludge, just soften it to free it off a bit.

If your interested have a butchers on Youtube for ceaning variable vane turbos & your'll see what I mean.

Hope this is of some help DDD.

dirtydirtydiesel wrote: Welton,
Spraying WD40 in through the inlet pipe will NOT affect the injectors, the only way to do that would be to put it through the fuel system

Burning any substance other than diesel in the cylinders might put deposits on the injector tips. That was my thinking but then I'm not a diesel engine combustion and deposit risk expert. This guy was talking about unloading the whole can into the inlet which will burn off in the cylinders, who know's what it'll do to the valves, injector tips etc?