Excessive smoke in Land cruisers

TOYOTA LANDCRUISER
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ROCKYARUN
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Our copany own 25 Land cruisers.
we bought 4 diesel engine(IHZ) land cruisers 2003 model, and installed turbo charger in 2005 in all 4 vehicles. These vehicles have done 25000 kms.

After installing turbo charger i found there is a excessive BLACK smoke in the exhaust. I checked the oil leak from turbo charger but seems to be ok. The engine oil level remains same, it is not going down.
The problem is in only 4 vehicles we have other turbo fitted same engine vehicles are normal and no smoke

Please suggest what will be the cause
May 7, 2006 at 8:32 AM
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LOSONE
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Black smoke is rich burning. It may be the turbos are responding fast enough causing a build up of fuel. Check the waste gate control system and they may need to be adjusted so they react faster.
May 8, 2006 at 3:13 PM