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PeteH
Member Since: 31 Aug 2022
Location: Hull
Posts: 2
 
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Hi, I'm new to the forum. I have a Discovery 4 Commercial with 200,000 miles (321868Km) on the original engine. I had the engine serviced recently at a garage I have used for the past 18yrs, on collection of he car i noticed when i drove away a guff of Blue smoke from the exhaust which i had not seen before. It only did it the once and did not do it again that day, the next time it did it I was overtaking and put my foot down the gear box kicked down and cloud of BLUE smoke was left behind me. I went back to the garage and they dropped a bit of oil out of the sump as the oil level indicator is not working but it still guffs, however only when I heavy accelerate or towing a heavy load. I've checked the compressor side of both turbos and intercooler for oil and it's clean. if anyone might have any thoughts on what it might be? theirs no smoke when driving normally only under load.
Thanks
PeteH
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 31st Aug 2022 7:33 am |
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Kilovolt
Member Since: 29 Jun 2015
Location: South Derbyshire
Posts: 1071
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The first thing I would check which is easy to do is to look for cracks/defects in the turbocharger intake pipe. Make sure they are all intact and tight at the jubilee clips.
https://www.ebay.co.uk/itm/124887171924?ch...j0EALw_wcB
I seem to recall it can cause this issue or similar issues 
Others will be along shortly 
 "Track day running - Don't put your foot back on the accelerator until your absolutely sure you don't have to take it off again"
Current Ride: D4 XS Commercial Baltic Blue SDV6 fully loaded with heated everything 
Track Days: BMW E36 M3 Evolution MY 1996 (3.2 Litre 377 BHP sat in 1,250 Kgs of car, with a pro safety cage and some serious braking power)
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| 31st Aug 2022 7:52 am |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8230
 
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As above could also be a damaged intercooler or split intercooler pipe. It can when others can't,
It will when others won't,
It goes where others don't.
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| 31st Aug 2022 8:41 am |
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PeteH
Member Since: 31 Aug 2022
Location: Hull
Posts: 2
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would a split or cracked pipe not create power loss or hiss? blow air? or show a fault with the MAF sensor?
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| 31st Aug 2022 9:27 am |
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Kilovolt
Member Since: 29 Jun 2015
Location: South Derbyshire
Posts: 1071
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Not necessarily. If you search for related pipe issues you'll find blue smoke is one of them.
A big crack or split will often be heard, but you only need a very slight air leak to start fooling the engine into over-fuelling. The MAF measures the air intake volume, it does not know there is a leak - it sees what it sees - if that makes sense.
Check the pipes thoroughly for starters "Track day running - Don't put your foot back on the accelerator until your absolutely sure you don't have to take it off again"
Current Ride: D4 XS Commercial Baltic Blue SDV6 fully loaded with heated everything
Track Days: BMW E36 M3 Evolution MY 1996 (3.2 Litre 377 BHP sat in 1,250 Kgs of car, with a pro safety cage and some serious braking power)
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| 31st Aug 2022 9:39 am |
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IainMac82
Member Since: 20 Jun 2018
Location: S36 7JA
Posts: 81
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Search ‘turbo drain mod’ - symptoms sound like this especially at that mileage. Mine started doing large blue puffs of smoke on heavy acceleration occasionally. The turbo drain mod kit has fixed the problem.
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| 31st Aug 2022 4:50 pm |
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