Autobahn speeds lots of black smoke

MGMarc · 16th June 2016, 08:19

At speeds that can't be achieved on UK roads my ZTT cdti which has a BigRuss remap smokes like a trooper (110mph plus)

Just wondering if it could be the O Rings??

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T-Cut · 16th June 2016, 11:13

I'd expect any diesel to emit some smoke at that speed. If it looks excessive, why not start by renewing the orings and take it from there.

TC

James.uk · 16th June 2016, 15:48

I doubt it's the "O" rings, why would an air leak to the outside prior to the air intake do that? More likely to be the MAF or PCV filter...

Fortes Injector cleaner may solve the problem...

I had smoke but Jules cured mine by removing the synergy after MarinaBrian did the 160BHP upgrade. No smoke at any speed now.

...

grivas · 16th June 2016, 20:29

Its is all relative, 110mph how often do you run at this speed, and for how long, in other words is the car 'used to this kind of speeds? as black smoke is due to overfuelling, clean injectors, new air filter, new fuel filter clean or better change PCV filter and if you dont drive the car vigorously on a regular basis the exhaust will smoke when you do until the build up of soot is reduced.
Finally a word to the wise, and don't take it the wrong way, don't drive at 110mph not a good idea.

DMGRS · 16th June 2016, 22:30

Check for any sign of oil around the intercooler elbow - a slight leak may not give noticeable smoke at normal speeds, but may open up under heavy load.

marinabrian · 17th June 2016, 07:01

Black smoke is due to overfuelling, and the prime cause is insufficient air present to burn the available fuel being injected.

You need to check the integrity of the air intake system first and foremost here, as deficiency in this area will give the symptoms you describe.

So intercooler hoses, o rings, EGR MAP sensor, them MAF sensor

Brian

75driver · 17th June 2016, 17:19

Quote:

Originally Posted by marinabrian

Black smoke is due to overfuelling, and the prime cause is insufficient air present to burn the available fuel being injected.

D

Strangely enough, I can't really see the air path from looking through the grille.
The end of the concertina flexi is sandwiched between the two metal bits at the top of the bumper.

Where does the air enter the concertina from?

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marinabrian · 17th June 2016, 21:18

Quote:

Originally Posted by 75driver

Strangely enough, I can't really see the air path from looking through the grille.
The end of the concertina flexi is sandwiched between the two metal bits at the top of the bumper.

Where does the air enter the concertina from?

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The surrounding atmosphere

Compressed air being forced in by the turbocharger is being compromised in the case of the OP

75driver · 18th June 2016, 11:36

Quote:

Originally Posted by marinabrian

The surrounding atmosphere

Very good.😄
What I mean is, it looks as if the air entry to the concertina, is completely encased, but I guess it's not.

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Mike Noc · 18th June 2016, 21:16

They fitted a water shedder plate in front of the inlet to prevent water droplets being injested when it rained, as they found that some could get through the air filter and contaminate the MAF over time.

16th June 2016, 08:19	#1
MGMarc Avid contributor MG ZT-T Join Date: Oct 2015 Location: Dorset Posts: 135 Thanks: 6 Thanked 23 Times in 11 Posts	Autobahn speeds lots of black smoke At speeds that can't be achieved on UK roads my ZTT cdti which has a BigRuss remap smokes like a trooper (110mph plus) Just wondering if it could be the O Rings?? Sent from my HTC One using Tapatalk

16th June 2016, 22:30	#5
DMGRS Discount MG Rover Spares Rover 75 CDTi, 2x MG ZS180 Join Date: Jun 2011 Location: Hythe, Southampton Posts: 11,320 Thanks: 456 Thanked 3,377 Times in 2,027 Posts	Check for any sign of oil around the intercooler elbow - a slight leak may not give noticeable smoke at normal speeds, but may open up under heavy load. __________________ Your trusted MG Rover specialist! Tel: 02380 001133 / Email: [email protected] We now have a 'chat' function on our site for even quicker replies. Give it a try! Remember - discount code FORUM5 for 5% off

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16th June 2016, 11:13	#2
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,751 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	I'd expect any diesel to emit some smoke at that speed. If it looks excessive, why not start by renewing the orings and take it from there. TC

16th June 2016, 15:48	#3
James.uk Passed Away 2002 Pale Blue. Rover 75 CDTi Connoisseur auto. 170K miles Join Date: Dec 2008 Location: Near the M67. Posts: 14,509 Thanks: 199 Thanked 585 Times in 397 Posts	I doubt it's the "O" rings, why would an air leak to the outside prior to the air intake do that? More likely to be the MAF or PCV filter... Fortes Injector cleaner may solve the problem... I had smoke but Jules cured mine by removing the synergy after MarinaBrian did the 160BHP upgrade. No smoke at any speed now. ...

16th June 2016, 20:29	#4
grivas I really should get out more....... Rover 75 CDT Club Tourer Join Date: Nov 2006 Location: Milky Way Posts: 2,368 Thanks: 105 Thanked 513 Times in 382 Posts	Its is all relative, 110mph how often do you run at this speed, and for how long, in other words is the car 'used to this kind of speeds? as black smoke is due to overfuelling, clean injectors, new air filter, new fuel filter clean or better change PCV filter and if you dont drive the car vigorously on a regular basis the exhaust will smoke when you do until the build up of soot is reduced. Finally a word to the wise, and don't take it the wrong way, don't drive at 110mph not a good idea.

17th June 2016, 07:01	#6
marinabrian MG ZT Join Date: Jan 2011 Location: Newcastle Upon Tyne Posts: 20,151 Thanks: 3,565 Thanked 10,837 Times in 5,718 Posts	Black smoke is due to overfuelling, and the prime cause is insufficient air present to burn the available fuel being injected. You need to check the integrity of the air intake system first and foremost here, as deficiency in this area will give the symptoms you describe. So intercooler hoses, o rings, EGR MAP sensor, them MAF sensor Brian

18th June 2016, 21:16	#10
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,546 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	They fitted a water shedder plate in front of the inlet to prevent water droplets being injested when it rained, as they found that some could get through the air filter and contaminate the MAF over time.