Citroen C5 X7 Strange noise at the engine

[leocitroen]

Super . If you think the hose might be fall down you can use plastic ties..

[vladd.alex]

There is not enough space for a tie, but I assume it will not fall down because it's always sucked by the vacuum. I have seen some oil in that heat shield which was covering both valves. Do you have any idea where can this be from?

[aljo221]

Leo, I have found a picture with the rear side of the engine. Which of the two identical solenoids have you changed? The left or the right one, according to this photo?

5260d1359349f38a6a262b66ca8660d0111.jpg

This is the part, about 20 Euro.

https://www.autokarma.ro/convertor-pres ... pa_order=8

Hello.
Isn't it the right one on the picture for the air doser and the left one for the turbo actuator?

[GiveMeABreak]

Actually this is for the DW10CTED4 engine:

[/attachment]

(4) Proportional Electrovalve Controlling the Variable Resistance Turbocharger (5) Cold Air Circuit Electrovalve (6) Hot Air Circuit Electrovalve (7) Variable Geometry Turbocharger

[vladd.alex]

It seems that we have three. So the right one it’s not from the turbocharger geometry. I would be very interested to see what is the circuit for every hose from the right valve. One it’s the environment air, through the filter, but the next two from the valve’s cap?

[GiveMeABreak]

Vlad

Here are the components of the EGR circuit which may help explain the circuit. (Bear in mind that the numbers of the components in the diagram in my previous post will not correspond to the same numbers on this one). We'll ignore the Turbo Electrovalve from the previous Diagram as this is just the EGR circuit.

So in the following EGR Diagram, Electrovalve (4) controls the Hot Air Mixer on the Air Doser, which is the same Electrovalve as number 6 on the previous Diagram.

Electrovalve (5) below controls the Cool Air Mixer on the Air Doser, which is the same Electrovalve as number 5 on the previous Diagram

Non-Cooled Exhaust Gases	Cooled Exhaust Gases

Ref	Designation	Ref	Designation
A	Control vacuum	A	Control vacuum
B	Mixture of inlet air and recycled exhaust gas	B	Mixture of inlet air and recycled exhaust gas
C	Exhaust gas	C	Exhaust gas
D	Air inlet	D	Air inlet
E	Electrical links	E	Electrical links
-	-	F	Cooled Exhaust Gases
1	Cylinder head	1	Cylinder head
2	Electrovalve controlling the EGR exchanger by-pass	2	Electrovalve controlling the EGR exchanger by-pass
3	Engine ECU	3	Engine ECU
4	Electrovalve controlling the hot air mixer	4	Electrovalve controlling the hot air mixer
5	Electrovalve controlling the cooled air mixer	5	Electrovalve controlling the cooled air mixer
6	Air intake double doser	6	Air intake double doser
7	Exhaust gas recycling (EGR) heat exchanger	7	Exhaust gas recycling (EGR) heat exchanger
8	Equipped with an EGR electric valve	8	Equipped with an EGR electric valve

[vladd.alex]

Hi Marc. Thank you for the circuit. I didn't know it that I have three valves on the engine and also a water cooled turbo. This engine is so complex, with a lot of subassemblies...But I want to believe that if one of the valves works not in the proper parameters, some errors would appear when scanning with Diagbox.

[marse]

Hello Marc,
first of all thanks Vlad for this topic as it helps me a lot with my situation.
I have a P1471 DTC showing open circuit of EGR.
Sometimes, after I erase the fault, it is not present in idle mode, till I push the throttle. Then it sometimes shows "sporadic" status or other times "permanent".
Even with it set, the EGR is responsive and seems to work, looking in the standard measurement menu.
What I do not get, is why my mechanic says the EGR has no connection to electrovalve 2 and that is only commanded electrically by the ECM whereas the schematic above presents eletrovalve 2 as EGR related?
Thank you for your advice!