im2009 Posted March 12, 2014 Share Posted March 12, 2014 Hi all. I have a problem with my 2008 1.6 TDCI Ford Focus that has around 175.000KM (130.000miles). My focus is running completely normally until the DPF regeneration starts. I know that the problem is during the DPF regeneration, because I have OBD2 connected and I am monitoring inlet air temperature. When this temperature rises form normal 20°C (+/-10°C) to 50-60+°C then DPF regeneration starts. This usually takes around 10-15km (10 miles) and then inlet temperature returns to normal. So, every thing is normal, but when DPF regenerations starts (usually on highways) then focus starts to falters, there is big loss of power and recently there is also some strange sound from turbine (sounds like turbine occasionally hits metal housing). In order to prevent heavy faltering and turbine damage, I have to be very gentle on throttle and drive at low input power and around 1000-1500 RPM. (i do not want to stop the regeneration process). It there is straight road i can maintain around 60mph, but it there is some uphill slope i can only do around 25-30mph!! But when the regeneration process is completed, then everything returns to normal, power is restored and there is no more strange sounds and I can go over 100mph without a problem. Like a miracle. :) I get following codes: P0234 P2459 One remark, I have a feeling that my mpg is not as good as it used to be? Any Ideas? Quote Link to comment Share on other sites More sharing options...
martyntdci Posted March 12, 2014 Share Posted March 12, 2014 here :- P2459 - Diesel Particulate Filer: Regeneration Frequency Possible Symptoms MIL on Possible Causes Heavy loads on engine (towing) Short trips in cold weather Faulty Exhaust Pressure Sensors (G450/G451) possible solution Change driving habits,Inspect Exhaust Pressure Sensors (G450/G451) as per factory repair manual. Special Notes Depending on driving habits, soot can build up quickly in the DPF, thus requiring more frequent regenerations than normal P0234 - Boost Pressure Regulation: Limit Exceeded (Overboost Condition) Possible Symptoms Malfunction Indicator Light (MIL) ON Boost Pressure too high Reduced Power Output Possible Causes Hoses incorrectly connected, disconnected, blocked or leaking Boost Pressure Control Valve (N75) faulty Boost Pressure Sensor (G31) faulty Turbo Charger stuck/faulty Possible Solutions Check Charge Pressure Control System Perform Output Test (to check the Turbo Charger) Perform Basic Setting (to check the Charge Pressure Control) Perform Pressure Test to locate Leaks Check/Replace Boost Pressure Control Valve (N75) Check/Replace Boost Pressure Sensor (G31) Check/Replace Turbo Charger Quote Link to comment Share on other sites More sharing options...
exponential Posted March 12, 2014 Share Posted March 12, 2014 Very impressive reply Martin! :-) Quote Link to comment Share on other sites More sharing options...
ed12 Posted March 12, 2014 Share Posted March 12, 2014 I presume when you say 100, you mean 70. ;) 4 Quote Link to comment Share on other sites More sharing options...
im2009 Posted March 12, 2014 Author Share Posted March 12, 2014 Thank you Martyn. Boost pressure valve/ sensor seems good place to start. I am looking for something that should get switched on or off during dpf regeneration and it doesn't. Sticking egr also? Ed, yes, i meant 130kmh of course (not from UK) ;) 2 Quote Link to comment Share on other sites More sharing options...
ed12 Posted March 12, 2014 Share Posted March 12, 2014 Haha, I'm sure you could get away with putting 160kmh, as most people don't seem to do the conversion! :P 1 Quote Link to comment Share on other sites More sharing options...
im2009 Posted March 13, 2014 Author Share Posted March 13, 2014 A few more words on this topic... As I said, I am looking for something that goes wrong only during dpf regeneration. In all other conditions cars runs normally, has good power, no turbo issues, etc. But during dpf regenerations, car is terrible. I already went to Ford mechanics for quick check and they gave me more general answers, nothing specific. What I am afraid is if i let them do the "research" they will take the easy way and start with changing of possible components, each of them for 100€ or soo until the problem will be resolved (Murphy says that faulty component will be the last on list :) ). I don't want to change good components, I would only like to change the faulty one. Does any one know how regeneration process works? Which valves opens and which one closes? There is some data in following document, but not all ( http://www.fordpers.be/content/assets/news-2011/pdf/Ford_tech_FAP_TDCi_NL.PDF) Since focus has 175.000km, and that there is dpf frequency problem and since I thing that mileage is not as good as it was, my assumption is that I may have EGR problems. EGR is starting to stick (no errors jet) so there is poor combustions with more carbon, dpf has to regenerate more often and if EGR has to be completely closed during dpf regeneration and it isn't.....This can cause my problems...or not? :) Any ideas would be appreciated. Thanx. Quote Link to comment Share on other sites More sharing options...
im2009 Posted August 29, 2014 Author Share Posted August 29, 2014 It was N75 valve or Turbo Pressure Solenoid Valve. Thanx Martyn! :) Quote Link to comment Share on other sites More sharing options...
fr0styTDCi Posted February 28, 2016 Share Posted February 28, 2016 Hi all, Where is the Boost Pressure Control Valve (N75) located and does anyone have a part number? I believe this may be the problem im currently experiencing. 1 Quote Link to comment Share on other sites More sharing options...
fr0styTDCi Posted March 1, 2016 Share Posted March 1, 2016 ok so this happened again on the way back from work exactly how im2009 explained. any help would be appreciated. Quote Link to comment Share on other sites More sharing options...
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