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C4 - DS4 Owners :: Forums :: Coupe and Hatch Pre 2011 cars :: Technical Questions

Vacuum valve turbo compressor

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Author Post
eldee99   
Mon Apr 16 2012, 03:18am
Hi all!

Today the turbo stopped working of my Citroen C4 coupe 1.6HDi (2005).
It seems the vacuum valve (close to the turbo) doesn't completely pulls the turbo into work. I attached a tie wrap, and the turbo was blowing again.

With cold engine the valve pulls the turbo into work, however, when the engine heats up, the valve does not completely pulls the turbo into work anymore. It just pulls half.

Are these symptomps familiar for you guys? Does the valve need replacement? Or is the issue more likely related to something else perhaps?

Thank you!

Eldee
Dave_Retired.   
Mon Apr 16 2012, 05:16am

Member No: #1
Joined: Aug 07 2006
Location: Northumberland
There is a known issue with the pipe connections and you need to replace the orange seal on the pipe as it cracks and lets air in and I suspect that's where you issue is

There is a picture on site - Click Here -
eldee99   
Mon Apr 16 2012, 05:45am
Hi Dave,

Thank you for your reply!
The issue does not seem to relate to the orange seal.
It is related to the vacuum valve around 10 cm's below the turbo.
This valve enables/disables the rotation of the turbo by exhaust gasses. (Sorry for this [%*^#@!] description, I don't know the correct technical words in English )

The valve does it job when the engine is cold. With warm engine the valve works partially.
petenjr   
Wed Apr 18 2012, 03:05am
So you are saying the Actuator is not working when hot. Have you checked the pipe connected to it? A friend of mine had a Pug 407SW HDi that had to have a new turbo because the shaft would seize when hot. Could be similar, not sure

eldee99   
Mon Apr 23 2012, 05:15am
Hi,

Thank you for thinking with me.
The problem indeed is with the actuator. This actuator opens/closes the wastegate. I think this actuator is leak. However, the costs are kind off high (200 pound), so I want to know sure if the actuator is the problem or maybe the tube or something else.
This is not a familiar issue with the 1.6HDi?

Thanks!

Eldee
Dave_Retired.   
Mon Apr 23 2012, 06:28am

Member No: #1
Joined: Aug 07 2006
Location: Northumberland
Yes it's familiar as a few members have had the same issue, but it's not 'common' i.e. suffered by lots of cars.
eldee99   
Mon Apr 23 2012, 08:01am
Thanks Dave,

In those cases was it the actuator that was the problem,
Or something else like a tube or something?

Do you perhaps have a link to simular threads on the forum?

Thanks!
Dave_Retired.   
Mon Apr 23 2012, 08:53am

Member No: #1
Joined: Aug 07 2006
Location: Northumberland
Just search on 'Turbo Actuator and you will find threads: - Click Here - like: - Click Here - - Click Here -
gmerry   
Mon Apr 23 2012, 09:27am
Member No: #11625
Joined: Nov 30 2009
Location: aberdeen
Hi Eldee, sorry no solution for you just a few words of explanation.

The Garret turbo-charger is variable geometry on the turbine part of the Exhaust Turbine - Inlet Air compressor Device (normally known as a Turbocharger).

There is no Wastegate on this Turbocharger setup. Basically the variable vanes change the angle that the exhaust air strikes the turbine blades to either let the exhaust pass straight through the turbine or to make the turbine absorb a lot of energy from the exhaust gas so that it can spin the the compressor wheel very fast and produce a lot of boost.

The downside of using variable geometry on the hot turbine side is that you have moving linkages/bearings exposed to hot exhaust gas. There is a possibility that surface corrosion, soot build-up, and wear of the moving parts mean that the inlet guide vanes simply jam and do not move when hot.


The fact that the actuator works (the actuator converts vacuum signal to mechanical push/pull) works when cold but does not work when hot suggests the problem is inside the turbo-charger itself. If you speak to a turbo charger specialist, or search the net, you will find a diagnostic procedure that involves using a vacuum pump (a hand pump will do) attached to the actuator and it will say how much vacuum is required to stroke the inlet guide vanes hot or cold.

If it is out of specification, you will need a replacement or rebuilt turbo. There are quite few posts on this forum of your options.

Regards
G
eldee99   
Tue Apr 24 2012, 07:07am
Hi,

The problem was with an electric vacuum valve in-line with the vacuum pump and the actuator. I think it's called a solenoid valve. The actuator itself was OK; however it received no vacuum.
Problem solved! Thanks for your replies.

Eldee
micaradu   
Tue Sep 29 2015, 05:42am
Member No: #42156
Joined: Sep 25 2015
Location: Brussels
Hello, eldee99! Can you please tell me where the valve is located and how can it be reached? I might have a similar issue after having the clutch replaced. I'm guessing one of the vacuum hoses got somehow disconnected, or the connector got disconnected from the valve.

Thanks!
Dave_Retired.   
Tue Sep 29 2015, 08:35am

Member No: #1
Joined: Aug 07 2006
Location: Northumberland
eldee99 has not been on site for over 3 years and is no longer a member and is unlikey to respond
zcream   
Thu Sep 19 2024, 06:26am
Member No: #60306
Joined: Dec 09 2022
Location: NSW, Australia
Does anyone have a link to "
diagnostic procedure that involves using a vacuum pump "

gmerry wrote ...

Hi Eldee, sorry no solution for you just a few words of explanation.

The Garret turbo-charger is variable geometry on the turbine part of the Exhaust Turbine - Inlet Air compressor Device (normally known as a Turbocharger).

There is no Wastegate on this Turbocharger setup. Basically the variable vanes change the angle that the exhaust air strikes the turbine blades to either let the exhaust pass straight through the turbine or to make the turbine absorb a lot of energy from the exhaust gas so that it can spin the the compressor wheel very fast and produce a lot of boost.

The downside of using variable geometry on the hot turbine side is that you have moving linkages/bearings exposed to hot exhaust gas. There is a possibility that surface corrosion, soot build-up, and wear of the moving parts mean that the inlet guide vanes simply jam and do not move when hot.


The fact that the actuator works (the actuator converts vacuum signal to mechanical push/pull) works when cold but does not work when hot suggests the problem is inside the turbo-charger itself. If you speak to a turbo charger specialist, or search the net, you will find a diagnostic procedure that involves using a vacuum pump (a hand pump will do) attached to the actuator and it will say how much vacuum is required to stroke the inlet guide vanes hot or cold.

If it is out of specification, you will need a replacement or rebuilt turbo. There are quite few posts on this forum of your options.

Regards
G

 

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