I have ABSOLUTELY NO POWER in my cdti150 when cold (-4.5c this morning)
it was ticking over happilly but stuck my foot to the floor in neutral and it took a good 20 seconds for the revs to get up to 2500... then the turbo spools up and it starts to pick up a little better. after 5 mins of trying to rev it, it eventually starts to get enough power to actually move the car - after 35 miles of motorway it will do 80mph (i suspect ) but have to drop it to 5th or 4th to keep the speed at around 70 when going up hill.
even when it's warm (water temp reading 72) it still has less than 50 bhp going by the feel of driving it. If I can keep the turbo spooled (2500-4k rpm) it seems happier but is grunting a bit.
I'm at a loss as to why this is happening - I don't think it's the injector wiring (although this needs changing - judders at idle sometimes) because the engine is running perfectly smoothly
there are a few possibilties:
something under the car went clonk when reversing off my 'driveway' over that annoying chunk of kerb that sticks out... but I can't see any damage to the exhaust and it doesn't sound any louder
it's been running with low oil for a couple of thousand miles which might suggest I've killed the turbo although the oil pressure light never came on and it does pull when the turbo is spooled.
EGR valve needs replacing/cleaning but that would go so suddenly would it?
Fuel level went down very very low and I filled up from asda right before they ran out of diesel too so might have crap in the lines/injectors... that seems unlikely though as I'm now half way through that tank of fuel and the problem is still getting worse.
coolant is a little bit low (half an inch off the line in the header tank) but that's where I didn't top it up properly after changing the water pump/cambelt tensioner etc...
spanner light is coming on first thing but does not stay illuminated so don't think it's in limp mode - probably just knackered old glow plugs causing that.
I have modified the airbox - taken the bit of plastic off the bottom and sawwed back the pipe out the top and remove the rain guard from off the front of the intake. I did not however drill a drain hole in the bottom of the airbox... This may sound stupid/obscure but what are the chances that heavy rain/big puddles followed by 5 degrees of frost have soaked and frozen solid my air filter?
I know my car is overdue for a lot of TLC but I don't think any of the things I have neglected have caused this problem....
any ideas help would be most appreciated. I'm going to do some work on it on saturday, check air filter, look at swirl flaps, have a proper look underneath see if the exhaust has been damaged...