Turbo????

[callumbentley1991]

Hi I have recently bought a w163 ml270.

It's gone into limp mode and found 2 codes

First was an egr code(vacuum pipe was loose so I repaired that)
This code has now gone and not returned after many road tests

Second code is p1470 - boost pressure regulation. Done some digging and checked all vacuum pipes, which all seem fine.

I can move the turbo actuator by hand but it's not moving when being revved.

Any ideas? Bought it from a trader who is willing to supply parts

 

[LostKiwi]

Check boost hoses for splits. Very common and can be hard to see.
You won't usually see the actuator move revving in neutral as you can't generate enough load.

 

[callumbentley1991]

I'm off work this week so I'm going to strip some bits down and check all boost/vacuum pipes.

 

[Steve@Avantgarde]

Usually the transducer for the EGR or the turbo.

 

[callumbentley1991]

It has new transducers and pipes but I'm unsure on what controls what to be honest

 

[callumbentley1991]

Quick update. Found a split vac hose which I replaced. Now getting full boost when driving. But it cuts out when I get to a junction.

It will restart and misfire for a few seconds then drive fine. No codes in the system

I camt hear a boost leak but I do get black smoke from the exhaust. Just removed the cat which looks very clear

Any other ideas?????

 

[LostKiwi]

Black smoke is too much fuel for the sir volume injected. Check the boost hoses (the big fat ones) and intercooler for leaks.

 

[callumbentley1991]

So I get a 'whooshing' noise through the turbo when I let off. It sounds like a leak but comes through the air filter