S40 (New) Engine 2.0D : Still no Boost

[138gat]

Hi, ok lets start from the top
S40 D 54 Plate
87000 miles
NO DPF
Owned for 4 years with regular servicing

Came out of work and had little or no revs and no boost at all,message on dash "Engine system service required" got it home slowly and parked on drive till rain stopped
Car would not even drive up drive
Got AA out who checked fault codes and came back with ;

P0047 Turbo boost control solenoid
P0101 Mass air flow circuit

AA man recommended i change the MAF sensor,
changed that and revs improved, can get it up drive now, still no boost
changed Tbc and nothing changed
still got fault "Engine system service required" and still no boost whatsoever
checked all pipes and fittings but can't see anything out of order
It's like driving a slug

Rapidly falling out with it now and it's becoming an expensive drive ornament
Any help would be much appreciated
cheers in advance

[SonyVaio]

Sounds like a classic case of a split boost hose or intercooler pipe / intercooler itself.

It is amazing just how feeble turbo diesel cars can be when there is a split in the boost pipe or an air leak in the system. Please tell me the AA man did do a basic hose checkover prior to recommending changing the MAF??

Some splits can be hard to find or see, especially if it is in the fold or bend of a pipe. You could do with a second person to revv the car while looking for splits (but please do be careful whee you put your hands if the engine is running). Some splits will only show themself when there is a bit of pressure going through and as the pipe flex's a split may show itself.

If your problem is nothing to do with splits, then you want to check the pipe that leads onto the turbo. This over time can lose its integrity and becomes week where it is prone to collapse. So as the turbo spins the pipe gets sucked but because its gone week it collapses and restricts airflow.

[Guru]

Originally Posted by 138gat

changed Tbc and nothing changed

Which one? there are two of those:



Or perhaps the turbo itself has called it quits! do hear it spooling at all?

[138gat]

Been thinking about this, when i took the pipes off the old TBC there was a whoosh of air came out but when i take the pipes off the new TBC aftyer running engine no whoosh, so maybe the pipes are a slacker fit.
I have some small spring pipe clips off a motorcycle carbs so i think i'll try them tomorrow then try looking for leaks how you said (minding my fingers)
cheers

[138gat]

changed the top one No 1 Guru

[Guru]

Ok then, try putting the old no.1 back in place, and try putting the newly purchased one in location no.2 and see if that helps.
No. 2 is difficult to reach though, probably more accessible from under the car after removing the under tray.

[138gat]

OK will try that tomorrow aswell, will let you all know how i get on
cheers

[138gat]

OK changed TBC No 1 for No 2 checked all pipes and fittings for leaks with engine running, all pipes seem to be pressuring up if you know what i mean.
It is running a bit better but i am still not getting that umph, that kick in the back if you floor it and it is still like a slug on hills/inclines.
Getting a slight over run, for a split second when i turn it off, could it be down to EGR valve or intake manifold or something like that ?
The more i run it the quicker it feels but that could just be me getting used to it
Any help would be much appreciated
cheers

[Guru]

Originally Posted by 138gat

could it be down to EGR valve

Yes of course it could! do this >> Linky

[138gat]

Think this problem is escalating,
Egr valve looks relaltively clear but i have noticed that i am getting quite a few air bubbles running through fuel line,
Would this reduce my fuel pressure and reduce my power ???
Got a new filter on the odds it will require changing