Auto TD5 Disco2 loadsa black smoke going uphill towing .

Title says it all . I don't seem to have power loss but when towing uphill smoke from exhaust is really bad . What are the common causes please.

Check your boost hoses/Intercooler for splits

what dimension tyres?...if they are more than 5% bigger than standard it can be black smoke while towing uphill without any other issues cos the addaptive strategy is mixed up and will overfuel it

sierrafery said:

what dimension tyres?...if they are more than 5% bigger than standard it can be black smoke while towing uphill without any other issues cos the addaptive strategy is mixed up and will overfuel it

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Tyres 255/55 R 18 ?

then it's not that, after you made sure there's no boost loss between the turbo and inlet unplug the MAF and drive it so for test

sierrafery said:

then it's not that, after you made sure there's no boost loss between the turbo and inlet unplug the MAF and drive it so for test

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will do but will have to be tomorrow now , thanks for hints/guidance.

Black smoke is over fueling (too much diesel) or lack of air into the cylinders.
So as above, check all the boost pressure hoses are good, and that the intercooler isn't damaged
also check the air filter isn't too dirty or any thing else restricting the air coming into the engine.

NFav said:

Black smoke is over fueling (too much diesel) or lack of air into the cylinders.
So as above, check all the boost pressure hoses are good, and that the intercooler isn't damaged
also check the air filter isn't too dirty or any thing else restricting the air coming into the engine.

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Hi and thanks , Have 'squeezed' and pulled at the hoses nothing loose and no apparent leakage from them when running and engine revved , air filter not too shabby either certainly changed at last service a few months back.
To eliminate any internal and unseen problems with hoses , new set ordered and will be fitted once arrived. Will report back .

Update 23/11
New boost hoses now fitted , first chance I have had to do job.
the larger hose from intercooler to manifold (1st one I removed) had a secret split underneath it, the little rascal !!! changed out the other two but both those were good .
Truck felt somewhat different on test drive and not too much smoke from rear on hard acceleration. Think this may be it beaten ? my mechanic friend keeps leaning toward the egr being blocked has this opinion any value ?

Update 23/11
New boost hoses now fitted , first chance I have had to do job.
the larger hose from intercooler to manifold (1st one I removed) had a secret split underneath it, the little rascal !!! changed out the other two but both those were good .
Truck felt somewhat different on test drive and not too much smoke from rear on hard acceleration. Think this may be it beaten ? my mechanic friend keeps leaning toward the egr being blocked has this opinion any value ?

yes it has, if the EGR is still on clean the MAP sensor too cos that's full of gunk and makes trouble