Toyota Landcruiser 200 series, VDJ200R V8 4.5 litre Commonrail 1VD-FTV Diesel EGR Blank/Delete/Reduce...High altitude power loss...

I did mentioned that I had earlier trouble with power loss at high altitude (above 1000m) of the 1VD-FTV.

Symptoms are next to no boost and lack of response. At sea-level, the 4.5litre V8 may hide somewhat the power loss given its reasonable torque even normally aspirated. One can notice that gear changes will be at higher rpm though. Only at high altitude would one really feel that power loss as the car would be "anemic" and your foot would be on the floor just to keep the car crawling.

So I decided to take off the intercooler and check again...and the first thing I noticed was that the boost feed going to that little plastic oil filter had a rather halfway inserted loose connection. Yes...it was leaking from a loose hose connection.

Check this oil filter to ensure that it is not cracked anyway. It may be hard to see. I had mine replaced.

From engine intake is this boost hose that goes to the MAP sensor.

Moral of this story...ensure the rubber/silicone/vaccum/boost hose is long enough and tight fitting enough both coming from the engine intake and passing the filter and going into the MAP sensor. Power was restored like new.