Exhaust sooting possible DPF Pipes

This is the Forum for all your Peugeot Technical Questions, Problems or Advice.

Moderator: RichardW

wattsey4u2day
Posts: 39
Joined: 29 Jul 2019, 20:06
x 3

Exhaust sooting possible DPF Pipes

Unread post by wattsey4u2day »

I have noticed an exhaust smell from the side of my car and also when a regen is taking place, smoke comes out from under the drivers side and up behind the bonnet. I had a look under the car today and noticed some sooting near the DPF Pipes. At the same time, im having some performance issues with my car. When its under load, the egr valve makes it jump just after 2k RPM. If I unplug the EGR, the car will run perfectly.

Do the DPF pressure pipes tell the EGR valve when to open and close?

Image

Online
moizeau
Donor 2020
Posts: 953
Joined: 12 Jan 2015, 17:08
x 128

Re: Exhaust sooting possible DPF Pipes

Unread post by moizeau »

You need to get it plugged in, I hate saying it, but with all the 'puters...Then post your Vin, make a donation, advise will arrive beforehand, but it may or may not be accurate. There are so many different systems in modern cars, without a proper PSA fault code you could end up weeing in the wind, and that can be expensive for no reason.

wattsey4u2day
Posts: 39
Joined: 29 Jul 2019, 20:06
x 3

Re: Exhaust sooting possible DPF Pipes

Unread post by wattsey4u2day »

My VIN number is VF3**************[VIN obfuscated, can be read by forum staff]. I have done a code scan on Diagbox but there are no fault codes that come up :(

User avatar
GiveMeABreak
Forum Admin Team
Posts: 19980
Joined: 15 Sep 2015, 19:38
x 1954

Re: Exhaust sooting possible DPF Pipes

Unread post by GiveMeABreak »

The DPF pressure pipes have nothing to do with the EGR. The EGR is managed by the engine ECU and will be opened or closed according to conditions (engine temp, torque and RPM). The EGR valve is closed during particle filter regeneration though.

The DPF upstream and downstream pressure pipes measure the exhaust gas pressure going in and coming out, to determine the level of blockage in the DPF which will determine when a regeneration needs to take place.

You shouldn’t normally be aware of this taking place on the road when the car is moving, but obviously if stationary, you will get some smell and fumes.

How many miles has the car done?
There can of course be other reasons for smoke like a hole in the exhaust system somewhere.

Online
moizeau
Donor 2020
Posts: 953
Joined: 12 Jan 2015, 17:08
x 128

Re: Exhaust sooting possible DPF Pipes

Unread post by moizeau »

Probably a different system on your car but have a read here.
https://www.frenchcarforum.co.uk/forum/ ... it=hiccups
Long thread but....

wattsey4u2day
Posts: 39
Joined: 29 Jul 2019, 20:06
x 3

Re: Exhaust sooting possible DPF Pipes

Unread post by wattsey4u2day »

The car is currently on 240,182 miles at the moment and still going strong. It regens every 100 or 200 miles I find. If driving and it regens, the engine sounds slightly different and the exhaust gets really boomy. The first time it happened I panicked as I didn't know what was going on!

User avatar
GiveMeABreak
Forum Admin Team
Posts: 19980
Joined: 15 Sep 2015, 19:38
x 1954

Re: Exhaust sooting possible DPF Pipes

Unread post by GiveMeABreak »

:shock: Ok, so unless it has had a new particulate filter, it is way past service life just for information.

On this vehicle with this engine, the service life of the particle filter is 210,000 KMs or 130,000 Miles. Although this will vary with driving style and conditions, most get more than this, but unless it has been changed, you are 100,000+ miles over it's life. So it is quite possible that the filter is starting to break up, hence the smoke from the front of the engine where the filter is located.

This graph details the driving conditions / speed used to calculate the weight of soot in the filter:
DW10CTED4 DPF Table.PNG
Key

"B" Engine torque (mdaN)
"A" Vehicle speed (miles/h)
"C" Calculation of the weight of soot present in the particle filter
"f" Soot (=carbon) present in the particle filter

There are 5 types of Driving Conditions. These are detailed below and show the average distance between regeneration based on these factors:
ReferenceDescriptionAverage regeneration distance
"a"Traffic conditions difficult200 kms / 124 Miles
"b"Traffic conditions fluid350 kms / 217 Miles
"c"Traffic conditions very fluid500 kms / 310 Miles
"d"Main road850 kms / 528 Miles
"e"Motorway1500 kms / 932 Miles

wattsey4u2day
Posts: 39
Joined: 29 Jul 2019, 20:06
x 3

Re: Exhaust sooting possible DPF Pipes

Unread post by wattsey4u2day »

I know it had a new DPF filter at about 80,000 and then it was flushed at 229,000 because it was 98% blocked according to the garage. I don't know if that makes any difference or not

User avatar
GiveMeABreak
Forum Admin Team
Posts: 19980
Joined: 15 Sep 2015, 19:38
x 1954

Re: Exhaust sooting possible DPF Pipes

Unread post by GiveMeABreak »

I suspected it may of been changed, given that mileage, it would be stretching it a bit! :-D

So it shouldn't of needed replacing at 80k for a start - so I suspect it has become blocked due to short start and stop journeys where the regeneration was being constantly interrupted. It may at that time of just needed a deep clean and would of seen you right for another 70k miles or so.

So as it stands you are now at the point where the new filter has come to the end of its service life.

What you need to be aware of is that whilst the soot gets burned off during the regeneration process, the Cerine in the DPF additive fluid cannot. The Cerine gradually builds up and lines the filter walls over time. It is this that ultimately blocks the filter.

wattsey4u2day
Posts: 39
Joined: 29 Jul 2019, 20:06
x 3

Re: Exhaust sooting possible DPF Pipes

Unread post by wattsey4u2day »

Uh oh! I can see an expensive bill coming up in that case! Im booking it into the garage when its open again to get them to investigate. I see you can get an aftermarket DPF at a lot cheaper price but whether they are any good I have no idea. Buy cheap by twice comes to mind!

User avatar
GiveMeABreak
Forum Admin Team
Posts: 19980
Joined: 15 Sep 2015, 19:38
x 1954

Re: Exhaust sooting possible DPF Pipes

Unread post by GiveMeABreak »

They are not as expensive as they were - there are lots of choices now.

Make sure that whoever does it (if you are going to replace it) is aware that they need to use an appropriate diagnostic tool to inform the engine ECU that the DPF has been replaced, so that it knows the amount of additive (and subsequently the amount of Cerine) that has been injected into the DPF is zero. This calculation is estimated, not actually measured, so it is important to do this or you will be getting warnings coming up earlier than necessary to change the particle filter.

If you need any parts info, we do need a small £10 forum donation that will cover you for up to 2 years, as we are charged for access now - details here:
A response to your question by a forum admin will require detailed vehicle information that requires you to have made a current contribution to the Forum.
Donate

Further Information

wattsey4u2day
Posts: 39
Joined: 29 Jul 2019, 20:06
x 3

Re: Exhaust sooting possible DPF Pipes

Unread post by wattsey4u2day »

Before I pray about having to save up some pennies, I took a couple of photos of the current DPF and EGR values on Diagbox incase they give any insight. Hopefully they are clear enough to make something out of them. Also on a tangent, i saw something which said "Controlled air inlet module" which was absent. Out of interest, what is the controlled air inlet module?

Image

Image

Image

Image

User avatar
GiveMeABreak
Forum Admin Team
Posts: 19980
Joined: 15 Sep 2015, 19:38
x 1954

Re: Exhaust sooting possible DPF Pipes

Unread post by GiveMeABreak »

I can't see anything there and 3 of those images are not displaying.

Please, if you are going to upload any images, use the full post editor and hit the attachments button at the bottom, then browse on your PC or your mobile to the picture locations and select. They will upload to the forum and you can then place them where you want. If you don't place them, they will just show in the upload order.

There is no need to use a third party image hosting site with the Forum.

wattsey4u2day
Posts: 39
Joined: 29 Jul 2019, 20:06
x 3

Re: Exhaust sooting possible DPF Pipes

Unread post by wattsey4u2day »

sorry marc, novice here ha! Try these
Attachments
D17A5101-C212-4707-B4FD-37FCF2225805.jpeg
E3547267-EDAE-4F23-90E4-FB206D026D23.jpeg
B9C720BF-9391-4D55-84D7-89F3C3F57D1B.jpeg
7CDDA4BD-A2B9-458D-ACB9-C27E9DC223C5.jpeg

User avatar
GiveMeABreak
Forum Admin Team
Posts: 19980
Joined: 15 Sep 2015, 19:38
x 1954

Re: Exhaust sooting possible DPF Pipes

Unread post by GiveMeABreak »

The main thing I noticed on picture 2 is the degree of soot clogging in the filter shown as 94%! Anything over 75% can lead to permanent clogging as filter gets so full that it makes any regeneration impossible.

Are you getting any warning on the dash concerning the risk of the particle filter clogging? I would be surprised inf not given this level of soot loading.
Next, your average regeneration distances are at the lowest end, meaning your car is not getting a good run for any length of time, resulting in more frequent assisted regeneration cycles. If these get interrupted as I said before (like the engine being switched off inadvertently in the middle of a regeneration), then it will employ various strategies to try and regenerate more quickly the next time, until it gets to the point where it cannot.

So I would be very wary of this as 94% clogging means it is almost totally full of soot.

Your additive level is about 1 litre or just under, so it thinks there is enough additive in the system. So if you are aware it is trying to regenerate, then it may not be able to clear this level of soot.