Member Since: 06 Feb 2019
Location: Hampshire
Posts: 879
Failed MOT on emissions. Injectors maybe?
Hey all. Thanks in advance.
My 2005 has failed its MOT on the emissions. Visibly too much blue smoke.
The garage is suggesting replacing the turbo, assuming the oil seals are faulty. I'm not so sure. I've plugged in the diagnostics and get the below readings on the injectors. Could the smoke be a result of too low pressure? I.e. poorly burnt diesel oil?
2022 BMW i4 M50. Bought Oct 2022. 10,200 miles and counting...
2014 BMW 435d convertible. Bought July 2021. 58,000 miles and counting...
2005 Discovery 3 HSE Auto. Bought Feb 2019. 169,000 miles and counting...
2009 Freelander 2 XS Manual. Bought Sep 2013. SOLD Aug 2021 (already regretted!)
Blue smoke is generally means you're burning oil...Si
2016 Disco 4 SE Tech
2019 Fiesta ST3
2021 GBS Zero
2nd Apr 2021 6:14 pm
DIY Ace
Member Since: 06 Feb 2019
Location: Hampshire
Posts: 879
I agree, hence the question. I'm wondering whether I'm burning diesel (which is oil essentially) at too low pressure, causing the blue smoke. I'm not noticing any oil loss in the lubrication system, which makes me question their diagnosis.2022 BMW i4 M50. Bought Oct 2022. 10,200 miles and counting...
2014 BMW 435d convertible. Bought July 2021. 58,000 miles and counting...
2005 Discovery 3 HSE Auto. Bought Feb 2019. 169,000 miles and counting...
2009 Freelander 2 XS Manual. Bought Sep 2013. SOLD Aug 2021 (already regretted!)
Member Since: 19 Jan 2013
Location: Ainum
Posts: 227
I think the engine is burning a hole in the top of the piston, stop using the car.
2nd Apr 2021 6:43 pm
DIY Ace
Member Since: 06 Feb 2019
Location: Hampshire
Posts: 879
Would this be caused by a faulty injector? And would a replacement solve it?2022 BMW i4 M50. Bought Oct 2022. 10,200 miles and counting...
2014 BMW 435d convertible. Bought July 2021. 58,000 miles and counting...
2005 Discovery 3 HSE Auto. Bought Feb 2019. 169,000 miles and counting...
2009 Freelander 2 XS Manual. Bought Sep 2013. SOLD Aug 2021 (already regretted!)
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
One reading really low, two really hgh.
I would hazard a guess the one reading low is doing so as the ecu thinks the injection cycle previous to it is to high so it is compensating.
Has the car been using oil?
Exhaust smoke on a common rail diesel is not as straight forward as older diesels.
Either way I would not be driving it for fear of internal damage.
Have a search as cyl number is not injector number.
2nd Apr 2021 7:37 pm
DIY Ace
Member Since: 06 Feb 2019
Location: Hampshire
Posts: 879
Interesting. No noticeable oil usage. Not sufficient to cause such a high amount of smoke. It smokes most once warm and idling.
I'm wary of replacing the turbo first. Perhaps i should replace the injector first. Any idea what cylinder number this low injector reading relates to?2022 BMW i4 M50. Bought Oct 2022. 10,200 miles and counting...
2014 BMW 435d convertible. Bought July 2021. 58,000 miles and counting...
2005 Discovery 3 HSE Auto. Bought Feb 2019. 169,000 miles and counting...
2009 Freelander 2 XS Manual. Bought Sep 2013. SOLD Aug 2021 (already regretted!)
Member Since: 06 Feb 2019
Location: Hampshire
Posts: 879
Yes, previous owner blanked them2022 BMW i4 M50. Bought Oct 2022. 10,200 miles and counting...
2014 BMW 435d convertible. Bought July 2021. 58,000 miles and counting...
2005 Discovery 3 HSE Auto. Bought Feb 2019. 169,000 miles and counting...
2009 Freelander 2 XS Manual. Bought Sep 2013. SOLD Aug 2021 (already regretted!)
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
DIY Ace wrote:
Interesting. No noticeable oil usage. Not sufficient to cause such a high amount of smoke. It smokes most once warm and idling.
I'm wary of replacing the turbo first. Perhaps i should replace the injector first. Any idea what cylinder number this low injector reading relates to?
Well if its not using oll that should discount the turbo which is good news as that is an expensive job, sadly that most likley means you have at least one duff injector, and they are not cheap either!
Smoke on idle on a commmon rail diesel is a classic injector fail.
If you do some searching and reading on here you will find many posts on injectors, some people have managed to cure them with the odd new one or two, sometimes it lasts, and other times some more need changing shortly afterwards.
Six new ones are 1200 quid.
Cheapest answer may be to remove all of yours and get them tested, then you at least know where you stand.
3rd Apr 2021 12:30 am
DIY Ace
Member Since: 06 Feb 2019
Location: Hampshire
Posts: 879
Thanks for the advice chaps. I'll whip out the injectors and get them tested.2022 BMW i4 M50. Bought Oct 2022. 10,200 miles and counting...
2014 BMW 435d convertible. Bought July 2021. 58,000 miles and counting...
2005 Discovery 3 HSE Auto. Bought Feb 2019. 169,000 miles and counting...
2009 Freelander 2 XS Manual. Bought Sep 2013. SOLD Aug 2021 (already regretted!)
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459
It could also be worn valve guide seals, on tick over with no boost there is a vacuum in the inlet side of the engine which can suck the oil down past the seals.
This causes blue smoke on idle and is worse as you drive away or rev the engine. The longer you leave it to idle the worse it gets.
When your driving and the turbo is spinning there is positive pressure in the inlet side and the oil cant leak.Andrew
D3 2.7tdv6 2005
D4 3.0 SDV6 Commercial died and gone to LR heaven
D5 3.0 SDV6 HSE
3rd Apr 2021 8:08 am
hugeviking
Member Since: 08 Jun 2010
Location: cotswolds
Posts: 1482
What about a faulty oil separator, could this be the cause
Andi
3rd Apr 2021 1:55 pm
lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
aja4x4 wrote:
It could also be worn valve guide seals, on tick over with no boost there is a vacuum in the inlet side of the engine which can suck the oil down past the seals.
This causes blue smoke on idle and is worse as you drive away or rev the engine. The longer you leave it to idle the worse it gets.
When your driving and the turbo is spinning there is positive pressure in the inlet side and the oil cant leak.
Turbo will be spinning all the time the engine is running, not making boost grant you but doubt there is neg pressure in the manifolds.
3rd Apr 2021 3:33 pm
aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459
Theres definatley neg pressure remove your map sensor with the engine running and put a finger over the hole.
I managed to trace a cracked inlet manifold by spraying brake cleaner on the manifold that was then sucked in and made the engine run roughAndrew
D3 2.7tdv6 2005
D4 3.0 SDV6 Commercial died and gone to LR heaven
D5 3.0 SDV6 HSE
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