Smoking 525d, whats the verdict?

[Gassey]

My old mans 2003 525d has started really smoking when stationary, anyone have any ideas what it could be?

[NickXX]

Have you tried changing the engine breather valve, or has it had an Inspection service recently?

Does it smoke a lot on full throttle? Does power feel like it could be down?

Have you checked if the EGR valve is gumming up?


This is my 330d at full throttle:



Changing the engine breather cures the smoke... for about 3,000 miles then it starts up again.

It's been this dirty since I've owned it (25,000 miles+ now). Power has always been spot on stock (tested on a RR) and economy is as expected.

I've given up trying to get to the root of it, I just let it be now. They're all dirty buggers, it just seems some are worse than others

Edited by NickXX on Sunday 4th November 17:36

[Gassey]

Hasnt done it before, its just had an oil change tho. No loss of power but the fuel consumptions seems to be worst.

PS nice pic and tar for the reply

[NickXX]

Do you know if the air filter has been replaced recently?

I would recommend changing the Engine Breather Valve - will cost you £30 using an OEM part, and will lengthen the life of the turbo. About an hour's labour if you get it done at a specialist/dealer.

[Gassey]

NickXX said:

Do you know if the air filter has been replaced recently?

I would recommend changing the Engine Breather Valve - will cost you £30 using an OEM part, and will lengthen the life of the turbo. About an hour's labour if you get it done at a specialist/dealer.

Cheers mate will pass that on

[Welshbeef]

It could be clogged injectors (maybe only one and maybe not fully blocked - so rather than a fine mist of fuel its dripping into the cylinder this causes black (unburnt fuel) smoke. You can repair these or if your bothered about wasting probably the whole of a Sat morning trying to do it then just buy a new injector (you will need to find which one it is first though).

However MPG should be slightly worse.

OR rather than stripping it down you can buy fuel additives/fuel injector cleaners just put a bottle into your fuel tank and after a few tanks it should have fixed itself.