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Engine stalling and uneven idle?

Tiny
IGORCHER
  • MEMBER
  • 2011 CITROEN C5
  • 2.0L
  • 4 CYL
  • TURBO
  • 2WD
  • MANUAL
  • 130,000 MILES
Hello. Can you please help me with my vehicle listed above 2.0 HDI, 136 HP? It has a rough and uneven idle, sometimes engine stalls (mostly when cold). Also, I'm sending you some pictures of oil leaks, which I don't know where they come from. I would appreciate any help. Thank you.
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Monday, September 25th, 2023 AT 11:43 AM

14 Replies

Tiny
IGORCHER
  • MEMBER
  • 9 POSTS
Pictures.
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Monday, September 25th, 2023 AT 11:47 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,959 POSTS
Sorry, we only handle one problem per thread, we handle the stalling and rough running issue on this thread. please post oil leak question here, you must be logged in:

https://www.2carpros.com/questions/new

It sounds like you have a vacuum leak, the throttle body needs service or the MAF sensor needs to be replaced, have you run the codes to see if any are stored?

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

And use this guide when the engine is cold only:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

This guide may help as well:

https://www.2carpros.com/articles/troubleshooting-rough-idle-in-your-cars-engine-7-common-causes-and-how

Please go over these guides and get back to us.

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Tuesday, September 26th, 2023 AT 12:41 PM
Tiny
BORIS K
  • MECHANIC
  • 762 POSTS
Hello,

Looking at the pictures of the oil leaks it looks like the oil is seeping from inside the intake system out of the joints. This could possibly be caused by excessive oil bypass on the turbo or a possible issue with the crankcase ventilation system (PCV)
Being a diesel, this in turn can cause excessive soot to build up in the intake manifold and throttle body which could be causing the uneven idle and stalling.
I would suggest to remove the intake pipe to the throttle body and have a look inside towards the butterfly.

A video:
https://youtu.be/YFVyhrC40eY?si=LsUUvMnrVxto_T-Y

Cheers, Boris
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Wednesday, September 27th, 2023 AT 1:28 AM
Tiny
IGORCHER
  • MEMBER
  • 9 POSTS
This is what I found when I opened the intake pipe and throttle body. I assume it is not good. What should I do?
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Wednesday, September 27th, 2023 AT 7:44 AM
Tiny
IGORCHER
  • MEMBER
  • 9 POSTS
P.S. There are no error codes in the car.
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Wednesday, September 27th, 2023 AT 8:02 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,959 POSTS
Thanks for the images. It looks like crankcase ventilation may be dirty or the engine is starting to wear. Also, the MAF sensor in the image I would replace because the sensor wire is contaminated.
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Thursday, September 28th, 2023 AT 9:52 AM
Tiny
KEN L
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It does look like the oil problem is causing rough idle so I will merge the questions, sorry about that.
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Thursday, September 28th, 2023 AT 10:27 AM
Tiny
IGORCHER
  • MEMBER
  • 9 POSTS
  • 2011 CITROEN C5
  • 2.0L
  • 4 CYL
  • TURBO
  • 2WD
  • MANUAL
  • 130,000 MILES
There is some oil leak in the engine bay of my vehicle listed above 2.0 HDI, 136 HP. I'm sending you some pictures of the oil leaks. Can you please tell me where this comes from? Thank you.
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Thursday, September 28th, 2023 AT 10:27 AM (Merged)
Tiny
IGORCHER
  • MEMBER
  • 9 POSTS
Here's some pictures from the oil leaks.
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Thursday, September 28th, 2023 AT 10:27 AM (Merged)
Tiny
IGORCHER
  • MEMBER
  • 9 POSTS
So, you think that the MAF sensor causes the rough idling and stalling? And how can I repair the oil leak, where should I look first, maybe turbo charger?
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Thursday, September 28th, 2023 AT 10:30 AM
Tiny
IGORCHER
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  • 9 POSTS
Forgot to tell you, I've cleaned the MAF sensor with petroleum, but still the same, rough idling and stalling are not gone.
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Thursday, September 28th, 2023 AT 10:33 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,959 POSTS
Cleaning the MAF sensor will not help, it must be replaced. I would remove the exhaust of inlet pipes to the turbo to check the endplay of the main shaft. Also, check the breather and crankcase ventilation system.

https://www.2carpros.com/articles/how-turbo-chargers-work

Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
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Thursday, September 28th, 2023 AT 12:31 PM
Tiny
IGORCHER
  • MEMBER
  • 9 POSTS
Do you maybe have a video or guide for taking off the inlet manifold of the Citroen C5, so I can clean it? (It's the part shown on the pictures I'm sending it to you). Thank you.
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Monday, October 2nd, 2023 AT 11:57 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,959 POSTS
That looks good, I assume this is after you cleaned it? No videos to be found on the subject, sorry.
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Tuesday, October 3rd, 2023 AT 10:49 AM

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