Engine: D5: - Smoke under acceleration.....sometimes. - Page 2

D5meister · Nov 22nd, 2015, 19:45

all diesels smoke a bit. During combustion there are localised oxygen shortages which produce the hydrocarbons - soot.

If you have a hint of turbo lag you will get the soot you sometimes see.

Plus, u get oil spit from the turbo front seal which comes thru the IC and is burnt.

A popular fail with this sypmtom is the Intercooler having tiny splits in it.

Look in the grille, it should be aluminum with dust and flies.

If it is wet black sticky oil mess in the center - your IC is ruptured.

robadob123 · Nov 23rd, 2015, 17:08

Meant to reply to this one a while ago.

Decided the intercooler must be goosed as the puff of smoke started to become a stealthy black cloud that followed me around everywhere so bought a brand new one off evilbay for £120 or so and fitted that.
The old intercooler had bowed top and bottom and was soaked in oil, so much so that the centre 6 inches was dry but the rest was properly coated. Wish I'd got a picture of it to be honest, it was that bad.

New intercooler installed and smoke vanished with only an odd puff when snapping the throttle open and, as a bonus, the engine is now much smoother and responds better to the throttle too.

Well worth the time and effort.

D5meister · Nov 23rd, 2015, 21:13

glad its sorted

Fred Woodworth · Dec 4th, 2015, 14:34

Something they don't tell you:
If you don't get to run your diesel hat and fast very often, you will find that carbon particulate builds up in the exhaust system. This can even cause your car to fail its MOT, as happened to me some years ago. I was advised to:
1. Add a fuel additive to the tank in advance of the MOT to "clean" the system.
2. Before the test, take the car out and, with the clutch down, floor the accelerator a number of times. You will see a decreasing amount of "smoke" out the exhaust (this could have failed your MOT). If you manage to do this in the rain, and away from houses, it will reduce local particulate pollution -- but this is not always possible.
3. Deliver the car to the test station with a hot engine (preferably just after no. 2 above).
Works for me!

Dec 4th, 2015, 14:34	#14
Fred Woodworth Junior Member Last Online: Jun 16th, 2016 10:08 Join Date: Apr 2009 Location: Ventnor, Isle of Wight	Diesel "smoke" and the MOT Something they don't tell you: If you don't get to run your diesel hat and fast very often, you will find that carbon particulate builds up in the exhaust system. This can even cause your car to fail its MOT, as happened to me some years ago. I was advised to: 1. Add a fuel additive to the tank in advance of the MOT to "clean" the system. 2. Before the test, take the car out and, with the clutch down, floor the accelerator a number of times. You will see a decreasing amount of "smoke" out the exhaust (this could have failed your MOT). If you manage to do this in the rain, and away from houses, it will reduce local particulate pollution -- but this is not always possible. 3. Deliver the car to the test station with a hot engine (preferably just after no. 2 above). Works for me!

Nov 22nd, 2015, 19:45	#11
D5meister Premier Member Last Online: Feb 10th, 2024 19:13 Join Date: Nov 2008 Location: Huntingdon	all diesels smoke a bit. During combustion there are localised oxygen shortages which produce the hydrocarbons - soot. If you have a hint of turbo lag you will get the soot you sometimes see. Plus, u get oil spit from the turbo front seal which comes thru the IC and is burnt. A popular fail with this sypmtom is the Intercooler having tiny splits in it. Look in the grille, it should be aluminum with dust and flies. If it is wet black sticky oil mess in the center - your IC is ruptured.

Nov 23rd, 2015, 17:08	#12
robadob123 New Member Last Online: Feb 15th, 2016 16:32 Join Date: Sep 2015 Location: bicester	Meant to reply to this one a while ago. Decided the intercooler must be goosed as the puff of smoke started to become a stealthy black cloud that followed me around everywhere so bought a brand new one off evilbay for £120 or so and fitted that. The old intercooler had bowed top and bottom and was soaked in oil, so much so that the centre 6 inches was dry but the rest was properly coated. Wish I'd got a picture of it to be honest, it was that bad. New intercooler installed and smoke vanished with only an odd puff when snapping the throttle open and, as a bonus, the engine is now much smoother and responds better to the throttle too. Well worth the time and effort.

Nov 23rd, 2015, 21:13	#13
D5meister Premier Member Last Online: Feb 10th, 2024 19:13 Join Date: Nov 2008 Location: Huntingdon	glad its sorted

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