DPF filling with soot too quickly

ratrace

Doctor786 wrote: »

Took the DPF out and found oil inside and also found oil on the EGR cooler. The side which goes inside the DPF with the fins on the EGR cooler was covered with the oil as well. Any idea how oil is getting into EGR cooler?

was there a lot of oil or just a little misting,if there was lots of oil then then i am assuming there is a worn seal/gasket that is letting a fair bit of oil in

but if there is only a little then that could just simply be due to incomplete combustion over time in combination with the hot egr gasses that are cooling down before being recycled creating vapour which leads to oily/slugdgey goo forming hence the reason on most diesels the inlet manifold which is supposed to be clean at all times has a layer of black sludge built up due to the egr gases be sent through it again after they have been already burnt before, there is a fair amount of theory involved and diffrent cars use diffrent methods to keep nox down

manualy cleaning the dfp will make a big difference proving it is done right, but you must make sure the pre and post dpf pressure sensors are working correctly and are suppling the correct data to the module's, if they are not the the dpf will fillback up fast and not regenerate automatically and you will be back to square one again

hope you get it sorted without too much hassle they can be a pain as dpf's are not really made for short journey's as many people have found out many of my mates have gone back to driving petrol due to the hassle with diesels such as turbo's going injectors egr dpf etc.... all cost a fair bit of money to put rght so the money saved on fuel just goes on repairs

Doctor786

ratrace wrote: »

was there a lot of oil or just a little misting,if there was lots of oil then then i am assuming there is a worn seal/gasket that is letting a fair bit of oil in

but if there is only a little then that could just simply be due to incomplete combustion over time in combination with the hot egr gasses that are cooling down before being recycled creating vapour which leads to oily/slugdgey goo forming hence the reason on most diesels the inlet manifold which is supposed to be clean at all times has a layer of black sludge built up due to the egr gases be sent through it again after they have been already burnt before, there is a fair amount of theory involved and diffrent cars use diffrent methods to keep nox down

manualy cleaning the dfp will make a big difference proving it is done right, but you must make sure the pre and post dpf pressure sensors are working correctly and are suppling the correct data to the module's, if they are not the the dpf will fillback up fast and not regenerate automatically and you will be back to square one again

hope you get it sorted without too much hassle they can be a pain as dpf's are not really made for short journey's as many people have found out many of my mates have gone back to driving petrol due to the hassle with diesels such as turbo's going injectors egr dpf etc.... all cost a fair bit of money to put rght so the money saved on fuel just goes on repairs

Oil wasn't dripping but there was clear sign of oil leak some where. Could be turbo charger leaking into EGR cooler. Really hard to tell with out taking out turbo as well.

ratrace

Doctor786 wrote: »

Oil wasn't dripping but there was clear sign of oil leak some where. Could be turbo charger leaking into EGR cooler. Really hard to tell with out taking out turbo as well.

The turbo has too connections one on the inlet side and the other on the exhaust side, there is a possibility that the turbo seals could be leaking, i would take the inlet intercooler pipe off the one that connects to the turbo and wobble the turbo shaft and feel for any end play some play is noraml and that is take up by the film of oil when the car is running, but if the shaft is scraping the turbo casing then yeah that could be a sigh of a worn turbo, or on its way out but this is not related to the dpf problem you are having that to me seems like a separate issue

another way to determine an excessive leak is to keep an eye on your oil level and se if that drops more than normal then this is further evidence that something is amiss

without seeing the car and looking at it its difficult to determine what is the primary issue and what is just normal wear and tear no system is sealed 100% so you will always get a mist of oil as parts wear over time

in regards to the turbo if the car smokes blue from the exhaust pipe either on tickover or under boost then that is a sign of oil burning either from the turbo seals (most likely on a diesel) or it could internal ie: the piston rings