i had mine at nissan on tuesday, they said everything was OK, still blows smoke but, they said they have had heaps come back and its normal for these vehicles, i believe thay have no idea. i have a egr blanking plate to install on the weekend, will see how that goes.
cheers
geoff
And the commonly installed catch can is attached to the output of the PCV (Positive Crankcase Ventilation) to catch the engine oil.
Diesels (much more than petrols, although they do it as well) allow some of the combustion gases to slip past the piston rings. "Allow" isn't really the right word - the goal is to minimise it, but anyway, the force of combustion squeezes some of the gas down the side of the piston and into the crankcase area.
This pressurises the crankcase area. Hot oil will splash, some of it will turn to vapour and it will be forced out the pipe that allows the higher pressure to escape. In the D40 engine (and perhaps the D22 as well, I didn't go looking) there is an oil trap in the top of the engine, but still some oil escapes - this is fed into the air intake between the air filter and the turbocharger inlet (because you don't want to try and push boost into the crankcase!).
A catch can will trap that oil and allow you to rescue/re-use it later.
Does it affect emissions? Not really. The specification for the crankcase oil in our diesels is JASO-FD - that's the highest rating for low-ash oil generally available. This means that if you burn the oil, it produces very few particles - it burns very cleanly.
So your catch can won't assist in emission control, but it might catch a little of the oil that the engine can't. Is that worth doing? Many people think so, and I'll do it as well, eventually.
Also being new does not garrunatee ur EGR valve is working right.
Mt d40 after 1000k developed weired EGR valve problems.
Blocking it off is the best solution, Nissan will never fix it if its EGR related.
Come to think of it , Do nissan fix anything on our cars?
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