 | Home > Puma (Tdci) > Engine issue? DPF issue? rpm is kind of weird.... |
 
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| Balvaig Member Since: 19 Feb 2016 Location: Fife Posts: 719   
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Hello member in Japan.
Sounds like the engine management system was running the DPF regeneration cycle. This happens automatically when you are on a longish run and are travelling above 50 mph. The DPF light on would indicate that you are only doing short runs and the DPF needs regenerating. Hopefully someone better qualified will comment soon. |
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30th May 2020 6:01pm |
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| Gehard Z Member Since: 15 Dec 2018 Location: Tokyo Posts: 29  
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Hello Balvaig!
Thank you for your advice! I have heard TDCI can do DPF regeneration cycle automatically but have no idea how it works. I don't have much experience and knowledge about diesel engine... So on defender the cycle will cause a little rpm up and power down? And I think I have never experienced that in winter does it mean the frequency of DPF regeneration is affected by weather? Thank you again! |
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31st May 2020 4:22am |
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| Balvaig Member Since: 19 Feb 2016 Location: Fife Posts: 719
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Hello again,
DPF regeneration is complicated. I have enclosed part of the Workshop Manual which explains what happens, and might explain your experience.If your orange DPF light is coming on it indicates that the DPF requires a regeneration, usually because the engine has not got up to temperature due to short journeys. The active regeneration process takes up to 20 minutes to complete. The first phase increases the DPF temperature to 500°C (932°F). The second phase further increases the DPF temperature to 600°C (1112°F) which is the optimum temperature for particle combustion. This temperature is then maintained for 15-20 minutes to ensure complete incineration of the particles within the DPF. The incineration process converts the carbon particles to carbon dioxide and water. The active regeneration temperature of the DPF is closely monitored by the DPF software to maintain a target temperature of 600°C (1112°F) at the DPF inlet. The temperature control ensures that the temperatures do not exceed the operational limits of the turbocharger and the catalytic converter. The turbocharger inlet temperature must not exceed 830°C (1526°F) and the catalytic converter brick temperature must not exceed 800°C (1472°F) and the exit temperature must remain below 750°C (1382°F). During the active regeneration process the following ECM controlled events occur: The turbocharger is maintained in the fully open position. This minimizes heat transmission from the exhaust gas to the turbocharger and reduces the rate of exhaust gas flow allowing optimum heating of the DPF. If the driver demands an increase in engine torque, the turbocharger will respond by closing the vanes as necessary. The throttle is closed as this assists in increasing the exhaust gas temperature and reduces the rate of exhaust gas flow which has the effect of reducing the time for the DPF to reach the optimum temperature. The EGR (exhaust gas recirculation) valve is closed. The use of EGR decreases the exhaust gas temperature and therefore prevents the optimum DPF temperature being achieved. The glow plugs are occasionally activated for up to 40 seconds to provide additional heat to assist in raising the DPF temperature.[/i] |
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31st May 2020 8:08am |
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| Gehard Z Member Since: 15 Dec 2018 Location: Tokyo Posts: 29
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Hello Balvaig
Thank you so much for providing so many details. 
If DPF regeneration can work automatically without warning light on I think it can explain my experience. The problem does always happen during long distance driving. I guess the power down what I felt may be caused by closed EGR or fully opened turbocharger? It is not a big problem on urban roads but when I am driving on slopes the power down really  me off 
But what surprised me is I have talked to some defender drivers here but no one has same experience with me... I doubt if I can find someone who have experienced same thing here |
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31st May 2020 6:37pm |
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| Balvaig Member Since: 19 Feb 2016 Location: Fife Posts: 719
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Hello Gehard Z
There is also passive regeneration. Passive regeneration requires no special engine management intervention and occurs during normal engine operation. The passive regeneration involves a slow conversion of the particulate matter deposited in the DPF into carbon dioxide. This process is active when the DPF temperature reaches 250°C (482°F) and is a continuous process when the vehicle is being driven at higher engine loads and speeds. Passive regeneration does not clear the DPF and eventually active regeneration is activated by the engine management system. Active regeneration occurs approximately every 250 miles. During this process additional diesel is injected into the system increasing the temperature in the DPF. All this should happen without any warning lights. A DPF orange light indicates a problem ( usually caused by frequent short journeys when the engine doesn't get up to temperature) and then you should take a 20 minute or longer journey, preferably around 50 mph or over. This should cause active regeneration and clear the warning light. Hope this is of help. |
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31st May 2020 7:00pm |
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| Julie Member Since: 07 Oct 2017 Location: Nantes Posts: 421  
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Hi - first of all there is a different idle speed if the car moves (ca. 850) or not (ca. 700)
Why are you so sure that your problem is related to the DPF ? Did you exclude all other issues (EGR, injectors, ++) ? |
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1st Jun 2020 12:57pm |
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| Gehard Z Member Since: 15 Dec 2018 Location: Tokyo Posts: 29
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Hello Julie
Thank you for your comment. 
Actually I am not very sure if it is related to DPF just I've experienced DPF light on last year and the changed sound really sounds like that time. And everything always returns to normal state in about 15~20 min so I guess it may be caused by DPF regeneration. About the rpm I mean when car stopped completely, neutral gear. |
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1st Jun 2020 4:23pm |
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| Kevantlin Member Since: 19 Jan 2020 Location: Lancaster Posts: 32 
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So sorry - what’s DPF
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1st Jun 2020 8:24pm |
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| Balvaig Member Since: 19 Feb 2016 Location: Fife Posts: 719
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Diesel Particulate Filter.
Fitted to Pumas with 2.2 engine. |
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1st Jun 2020 8:50pm |
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| Kevantlin Member Since: 19 Jan 2020 Location: Lancaster Posts: 32
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Thank you
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1st Jun 2020 8:52pm |
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| Julie Member Since: 07 Oct 2017 Location: Nantes Posts: 421
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If was the amber DPF light, I’d have my DPF pressure sensors checked / tightened. You may DIY because it’s just 2 nuts. |
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2nd Jun 2020 6:57am |
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| andydef90 Member Since: 09 Feb 2015 Location: yorkshire Posts: 617 
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do you use your car on short journeys if that's the case id give it a good run it may not be able to do a regen
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2nd Jun 2020 7:13am |
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| Gehard Z Member Since: 15 Dec 2018 Location: Tokyo Posts: 29
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Thank you for your advice
It just lighted on for twice last year but I think I will do a check next time. But I checked the forum and found a lot of members said they are unaware of auto DPF regeneration so I am still not sure if the sound I heard is DPF regen or not. |
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2nd Jun 2020 8:36am |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11240 
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The sound does seem to vary a bit between vehicles, but what you've described matches my experience of auto regeneration. Unless the light comes on a lot, I wouldn't worry about it. Darren
110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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2nd Jun 2020 8:44am |
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