1997 312 sprinter no power!

[matchlesspat]

Hi, I am new to this computer thing!! My 1997 412 sprinter has lost a lot of power lately, if it can see a hill in the distance or has a slight headwind etc it slows up a lot, it is in great condition, first time starter, used almost no oil, no smoke, idles well, revs out at 4000 rpm, it has a heavy luton body and taillift so I don't expect too much but 45 mph up hill on the M11 is not what it used to be like, no warning lights on dash, just passed class 7 mot, averaged 22mpg on a recent trip to southern Germany but no power, any ideas???
seems to have a noticable but slight flat spot at 2000 rpm and 3000 rpm but no great power even at 3500 rpm, not missfiring, no noises, had new bearings , head gsk and decoke etc two years ago,

Pat

 

[BlackC55]

Has it a CDi engine?

It may do at that age. (look at the engine cover) If it does not they are quite sluggish and do struggle to hit 70mph. Has it got a turbo? Is the turbo performing properly?

 

[matchlesspat]

Hi, it is the pre cdi 5 cylinder 2.9 turbo engine, 120 hp, feels more like 80 hp, I did not think a turbo could loose performance unless it had munched itself and then the exhaust would fill with oil?? but it does feel like a non turbo!!!!!

Pat

 

[BlackC55]

A boost hose could be off.

The turbo wastegate could be open all the time loosing boost?

 

[daz 585]

turbo boost control valve, it sits on top of the black turbo intercooler pipe at the front of the engine, it is around the size of a oxo cube?? the van will run ok, but be as flat as a fart to put it blunt, it will rev up but wont pull, easyiest way is to pop down to a local deisel centre and ask them to put it on there computer, it should show you the faults anyway, the turbo boost switch cost around £50/£60 from mercs, it will have a little rubber hose going into the under neath of it, daz