Somethings leaking on my 2004 TD4

darange · May 28, 2015

No loss of power but I'm getting the smell of diesel coming from under the bonnet.

I had a look and this is what I see. It seems to be coming from that wire connected to the big hose there.

Any ideas?

clarkkent · May 28, 2015

That is the maf sensor and the pipe is from the turbo.
By the looks of them they need replacing. When was car last serviced?

darange · May 28, 2015

Car was last serviced only a few months back but it was only a basic service. What causes this problem?

Skinny Mike · May 28, 2015

That oil is probably coming out of the dip stick. Your crankcase breather filter is blocked. This is not good!
Search crankcase breather to find out how to change it and/or up grade to the BMW part.
Personally I wouldn't drive it til you've sorted it.
Its quite an easy job, but very fiddly, I put the upgrade BMW part in, then you can forget about it.
Mike

darange · May 28, 2015

Skinny Mike said:
That oil is probably coming out of the dip stick. Your crankcase breather filter is blocked. This is not good!
Search crankcase breather to find out how to change it and/or up grade to the BMW part.
Personally I wouldn't drive it til you've sorted it.
Its quite an easy job, but very fiddly, I put the upgrade BMW part in, then you can forget about it.
Mike

Eeek! Thanks for letting me know.

hd3 · May 28, 2015

the attached pic be the air-intake-temp.- sensor

oil leakage could be from the intercooler hose joins ..
( i.e. those hoses will always have a small amount of oil thru them )
and / or from that sensor housing seat ..
( also check there are no splits or small holes in the intercooler hoses
( in particular where the top one potentially rubs against a bolt/screw head

if oil is coming from the dipstick ..
you can check by running the engine with dipstick removed ..
see if oil is pumping out there ..
that will indicate the crankcase vent system ( filter and valve )
Needs to be cleaned/renewed ..

darange · May 29, 2015

We did a test with the dipstick out, revved up to 3000 and no oil coming out. It could well be a hose but I'm going to replace the crankcase filter anyway as I don't think its been done for at least three years.

Skinny Mike · May 29, 2015

If you look at the oil spatter, I would be surprised if it was coming from anywhere else. Don't forget it takes a while for the pressure to build before the oil will come out.
Good idea to change the filter anyway.
Best of luck.
Mike

jedi · May 29, 2015

And oils probably being thrown everywhere by the drive belt and pullys.

Richard Martin · May 29, 2015

If there is a smell of diesel then it's worth having a look at the hp fuel pump which isn't far underneath where that photo was taken

edwardcraney2012 · May 29, 2015

Its probably the diesel pump just below all that. would explain the smell

Somethings leaking on my 2004 TD4

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