BMW 3 Series - Older BMW emitting clouds of black smoke - Chrome

Earlier this week I was driving a couple of cars behind an older BMW 3 series, on a 'B' road, passing through a '30' speed-hump urban area. The BMW caught my attention as it was emmiting big 'puffs' of thick black smoke every time the driver accelerated between the humps. Once the road became NSL the BMW accelerated and belched out an incredible plume of this thick black smoke which obliterated any forward view of the road (coverage between the verges and about as high again) and all cars behind had to slow dramatically to cope with the zero visibility. I am guessing this was a diesel BMW but wonder what would cause such volumes of black smoke to be emmited and surely this car cannot be long for this world? Looking into the distance as the smoke dispersed I could still see the car up the road, still smoking but had morphed into a sort of grey haze trailing behind the car. Next time I see it I'll grab the number and report.

BMW 3 Series - Older BMW emitting clouds of black smoke - RobJP

Sounds like a major fault - injectors shot or burning loads of oil.

Hopefully they get pulled by the police - who can issue a prohibition order on the spot for a 'gross polluting' vehicle, or for one causing a hazard to other road users.

BMW 3 Series - Older BMW emitting clouds of black smoke - corax

Probably an E46 2.0d. Plenty to go wrong on them, they are getting old and they were never the,most reliable engine, certainly not in the same league as something like a VAG PD engine.

What could cause so much smoke? Take your pick. A moody remap, blocked air filter, injection timing, EGR e.t.c

BMW 3 Series - Older BMW emitting clouds of black smoke - elekie&a/c doctor
Could even be an earlier E 36 model .Diesel variants were introduced in around 1993. Who knows if it is a diesel?
BMW 3 Series - Older BMW emitting clouds of black smoke - badbusdriver

I remember going to pick up a Saab 900 turbo once, the clouds of smoke coming out the exhaust on the drive back to the dealership was horrendous!. I'm surprised the police didn't pull us over. Turned out the turbo was knackered.

BMW 3 Series - Older BMW emitting clouds of black smoke - bolt
Could even be an earlier E 36 model .Diesel variants were introduced in around 1993. Who knows if it is a diesel?

I`ve seen 4 year old bmw`s chucking smoke out back but no one does anything about them, similar aged ford diesels are the same, almost as bad as the old buses were

BMW 3 Series - Older BMW emitting clouds of black smoke - SkodaIan

It can be as simple as a small hole or slack jubilee clip in the air pipe between the flow sensor and the air intake. It happened to my sister's Volvo and also a mate's Zafira with a few weeks of each other a few years back.

The escaping air ( which makes a right racket as it's pushed through at high pressure by the turbo) means that not all the air going through the flow sensor goes into the engine. There is then far too much fuel for the amount of available air, meaning lots of black smoke!

In both cases I'm aware off, after replacing a £1.50 part, the car ran fine for another 50k miles at least.

 

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