Recent content by npritch
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R 350 CDI, black smoke, jerky at low revs, soot on exhaust, occasional limp mode
Yes - the smoke test would only find a vacuum leak (I think I'm right) - but the split in the boost pipe wouldn't be picked up by a smoke test. Also the split in the boost pipe was only spotted under pressure... -
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R 350 CDI, black smoke, jerky at low revs, soot on exhaust, occasional limp mode
Hi Teddy - I think they ran a diagnostic - the fault codes showed a turbo boost problem - which I assume wouldn't be detected with a smoke test - but only with a boost test. The part was just over £100 and the whole bill inc. VAT came to just over £200... hope that helps? -
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R 350 CDI, black smoke, jerky at low revs, soot on exhaust, occasional limp mode
I'm afraid I don't know Teddy - they said it was the lower one - and not easy to spot - until they did the boost test... -
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R 350 CDI, black smoke, jerky at low revs, soot on exhaust, occasional limp mode
Solved! Thanks to all for the help. It was (as some of you suggested) a split OSF lower boost hose - detected after a "boost test". Around £200 and I have my old car back - such a relief. Thanks again. -
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R 350 CDI, black smoke, jerky at low revs, soot on exhaust, occasional limp mode
Teddy it pretty much happens all the time - but only at low revs. The "limp mode" is intermittent though ... -
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R 350 CDI, black smoke, jerky at low revs, soot on exhaust, occasional limp mode
I just removed the air intake Y pipe to check which actuator to order - I noticed a small pool of oil where the pipe goes into the turbo - is that usual? or would that indicate that the PCV valve needs replacing... I ask because it would probably be sensible to do both at the same time - however... -
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R 350 CDI, black smoke, jerky at low revs, soot on exhaust, occasional limp mode
Thanks Unclebuck - I'll give it a go... -
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R 350 CDI, black smoke, jerky at low revs, soot on exhaust, occasional limp mode
Larkone - great advice - the swap doesn't look overly complicated - just rather cramped - so may give it a go myself... thanks again. -
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R 350 CDI, black smoke, jerky at low revs, soot on exhaust, occasional limp mode
Yes on light throttle and Juddering describes it well - I might have to give the swap a go myself... -
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R 350 CDI, black smoke, jerky at low revs, soot on exhaust, occasional limp mode
Thanks again Supernoodle really helpful - definitely "hesitation and surging" is a much better description of what I am experiencing - as mentioned only between 1000 - 2000 revs... so the actuator looks to be the most likely culprit - not sure if I am brave enough to try to swap the actuator out... -
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R 350 CDI, black smoke, jerky at low revs, soot on exhaust, occasional limp mode
Thanks Supernoodle. That’s really helpful. Looks like it could be a problem with the actuator then? -
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R 350 CDI, black smoke, jerky at low revs, soot on exhaust, occasional limp mode
Thanks Phil - I'll add that one to the long list... -
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R 350 CDI, black smoke, jerky at low revs, soot on exhaust, occasional limp mode
One other thing... the engine warning light came on today and the code from the reader was as follows not sure if it sheds more light? P0299 Raw code: 0299 ECU: Engine control unit Status: Confirmed OBDII: Turbocharger (TC)/supercharger (SC) - low boost ============2============== 1335552 Raw... -
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R 350 CDI, black smoke, jerky at low revs, soot on exhaust, occasional limp mode
Great stuff Larkone - many thanks -
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R 350 CDI, black smoke, jerky at low revs, soot on exhaust, occasional limp mode
Hi Larkone - another forum suggested a problem with the turbo actuator (I had a quick look - it seems to be working - ie the arm moves). And/or with the PCV valve - but wouldn't that produce blueish smoke rather than the black sooty smoke I'm getting?