[digitaldav]

Originally Posted by Greck

What do you mean, connection with SCR cat or engine-dpf?

I had the came issue smell in cabin when vent fan on. I found the problem with misalignment of downpipe to turbo. Had to loosen the V-Band clamp and realign pipe.

[Owen81]

Ya, the down pipe to turbo connection (where your dpf used to be). Some have said the down pipe to exhaust connection as well

[Greck]

How I can check it to be sure that the issue is in the Turbo->DPF connection? Should it smell and smoke on idle? Should be any other visual sights?

I replaced the DPF and SCR recently and changed the all gaskets, I didn't notice any evidence of smoke\leaks... but the smell is still there and it was there before DPF\SCR replacement...

Thank you.

[Owen81]

If you still have the SCR/DPF in place, you shouldn't be getting any diesel smell in the cabin.
I would double check your exhaust connections, and since it was there before, maybe your DPF sensor tubes.

[Greck]

DPF Sensors tubes should leak the smoke even on idle? or only under load on speed lets say above 25 miles\hour?

[Owen81]

If its cracked or leaking it would leak anytime. If it was bad you would be throwing a DPF code though I'm sure

[Yozh]

Replacing one of those lines is a real beotch. They would have to have unbolt the turbos for the job. But I'm surprised they are replacing your LP turbo for the leaks in the turbine switchover flap shaft. Ususally, they ignore it and there is even an SIB saying it's normal. Where did you take it? Jessel or AutoWest?

[Yozh]

Try to keep your old one....
BMW Langley did CBU cleaning for one of the guys here for C$700

[ShowerBabies]

My 2011 had that issue when it was under 30k. It was some gasket at the EGR something majigger.

[AustinMsport]

Originally Posted by davethetenor

Is there an abnormal hissing sound coming from the engine bay while accelerating?

Sorry for the old thread bump. I just bought an X5D last week and yep its got the slight exhaust smell in the cabin with fan on plus a weird hissing sound during acceleration. Any ideas?

[davethetenor]

Originally Posted by AustinMsport

Sorry for the old thread bump. I just bought an X5D last week and yep its got the slight exhaust smell in the cabin with fan on plus a weird hissing sound during acceleration. Any ideas?

I don't have my 335d anymore, but I recall that the issue was a rubber DPF pressure sensor line on the passenger side of the engine, about halfway back, right above the exhaust manifold. I replaced it once, and then it came back a few months later. My suspicion is that my EGTs were too high and the excess heat was causing that line to fail.

[AustinMsport]

Thank you

Originally Posted by davethetenor

I don't have my 335d anymore, but I recall that the issue was a rubber DPF pressure sensor line on the passenger side of the engine, about halfway back, right above the exhaust manifold. I replaced it once, and then it came back a few months later. My suspicion is that my EGTs were too high and the excess heat was causing that line to fail.

[lightspeed]

Originally Posted by AustinMsport

Sorry for the old thread bump. I just bought an X5D last week and yep its got the slight exhaust smell in the cabin with fan on plus a weird hissing sound during acceleration. Any ideas?

Hi AustinMsport, did you figure out what was causing the hissing? I'm experiencing the same thing.

Thanks in advance!

[32valves]

Originally Posted by lightspeed

Hi AustinMsport, did you figure out what was causing the hissing? I'm experiencing the same thing.

Thanks in advance!

I had that problem once it was the small turbo being loose which then blew out the turbo gasket.
First it smelled in the cabin then under acceleration it whistled. Found it by all the black soot on the turbo flange.

[RebornS14]

Originally Posted by davethetenor

Is there an abnormal hissing sound coming from the engine bay while accelerating?

yes i can hear the turbo spooling in my cabin. did you have the same issue? would love to know what it is.

[cr1do]

cracked manifold?

[brenden1207]

Does this also apply to N47's as well? F31 328d 180k miles having slight diesel smells in cabin, decrease in mpg as well not too sure if related

[C3rb3rus]

Zombie thread for sure. I had a diesel smell too, and can confirm it was the EGR cooler that had cracked by the bellow. Make sure to fix it ASAP, I let mine go for too long and it eventually melted a section of the plastic intake pipe. Don’t be like me.