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Home > Technical > DPF Problem - Ongoing... |
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oldgeezer Member Since: 09 Apr 2011 Location: Wiltshire Posts: 1302 |
A simple boost leak can cause too much soot, as can a leaky injector as can a restricted air intake as so could a problematic EGR valve. Jaguar x-type sport gone
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22nd Aug 2022 8:57 pm |
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I Like Chips Member Since: 25 Jun 2017 Location: Ascott Under Wychwood Posts: 1529 |
What Engine oil are you using |
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22nd Aug 2022 9:26 pm |
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I Like Chips Member Since: 25 Jun 2017 Location: Ascott Under Wychwood Posts: 1529 |
Have you checked the DPF pressure sensor, the two hoses are known to fail |
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22nd Aug 2022 9:34 pm |
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freypal Member Since: 08 Sep 2016 Location: Shropshire Posts: 55 |
Would any of these manifest as poor performance? As far as I can tell the car has plenty of power, starts fine, no visible smoke. Never had an EML appear and there are no codes relating to the EGR system. |
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23rd Aug 2022 10:48 am |
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freypal Member Since: 08 Sep 2016 Location: Shropshire Posts: 55 |
Not sure on the oil sorry, the car has been serviced a few times at different local garages and the issue has persisted so I would assume it's had several different oils in. On the DPF pressure sensor, is this something easy to check? Also on the sensor does anyone know what the pressure value should read with the ignition on, engine not running. I would have assumed it would be 0kPa given there is no exhaust flow across the filter but mine reads 1.0kPa on the IID tool. Not sure if there is a permanent offset applied? |
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23rd Aug 2022 10:52 am |
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I Like Chips Member Since: 25 Jun 2017 Location: Ascott Under Wychwood Posts: 1529 |
Here is a movie on the sensor. check the pipes, maybe get them off and check for splits
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23rd Aug 2022 1:52 pm |
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JonMs Member Since: 25 May 2018 Location: Ilkley Posts: 101 |
I've just gone out and checked, ignition on, engine off, GAP IID BT gives a value of 1.0kPa for DPF pressure on my 2011 SD4. Same as your value. Also, have you seen this video? it might be useful. |
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24th Aug 2022 9:27 am |
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freypal Member Since: 08 Sep 2016 Location: Shropshire Posts: 55 |
I'll have a look, thanks! |
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24th Aug 2022 8:44 pm |
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freypal Member Since: 08 Sep 2016 Location: Shropshire Posts: 55 |
Thanks so much for doing this, very much appreciated and really helpful! The video is very useful also for comparing parameters too so thanks for that too! I'll try and match the conditions to see what values I get. Starting to lean towards the DPF being fine but the engine running "dirty". Just strange as I'd have expected to notice some kind of performance impact or additional associated fault codes... |
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24th Aug 2022 8:49 pm |
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freypal Member Since: 08 Sep 2016 Location: Shropshire Posts: 55 |
Had a quick look at the throttle body flexi hose which normally seems to go and can't see any obvious splits in it. Flexi hoses attaching to the DPF pressure sensor also look good....
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26th Aug 2022 9:52 am |
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JonMs Member Since: 25 May 2018 Location: Ilkley Posts: 101 |
Just to say, in addition to the DPS sensor pipes splitting etc, the DPF sensor itself can fail. Mine failed just after I bought the car and was difficult to diagnose. The only symptoms were the car going into Reduced Performance mode intermittently . There were no fault codes. It was fixed under warranty so unfortunately I don't know exactly how the mechanic diagnosed the problem, only that he used live data and the voltages were out. |
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26th Aug 2022 10:36 am |
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freypal Member Since: 08 Sep 2016 Location: Shropshire Posts: 55 |
Hi again, sorry but in relation to your latest reply on faulty pressure sensor... Could I possibly trouble you for another check when you have time? With the ignition on and the engine off, is your pressure sensor voltage signal steady? I'd assume it should be rock steady as there is no exhaust flow so no possible change in pressure. Mine is jumping between two values though. I know they are very small changes but I wonder if it indicates the sensor might be having problems...;
With the engine idling the value seems to oscillate a lot more but i could probably believe that. although it would be interesting to see if it's normal! The youtube videos you kindly linked seem to show a much more stable value than i have too...;
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27th Aug 2022 1:44 pm |
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JonMs Member Since: 25 May 2018 Location: Ilkley Posts: 101 |
On my car the values with ignition on but engine off are very similar to your graph in that the voltage oscillates between two values and is very stable. The only difference is that my values are higher, between 0.493 and 0.498. I don't know if this is significant or not.
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29th Aug 2022 3:13 pm |
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AJ918 Member Since: 26 Mar 2018 Location: North West Posts: 260 |
Hi having read the above I would ask the following basic questions in order to try and understand the basic issue.
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29th Aug 2022 4:44 pm |
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