C220 Cdi w203 location of turbo boost controller.

[peternutkins]

Still having problems with no boost over 2000 rpm goes like a rocket until then and the power just drops off.

I have got one of these cheap wi fi diagnostic things and it showing about 3-4 psi until 2000 rpm then nothing.

I am trying to fine the boost control solenoid but can't see where the vacuum pipes are going.

Thanks

Peter

 

[mersum1es]

Other way down, locate turbo, locate VNT actuator joint, follow arm to vacuum actuator. You did found vacuum controller? BTW You can swap controller with egr...

 

[peternutkins]

No haven't actually looked at the turbo yet, just looking for leaks, I will do though, thanks for the info.

Peter

 

[peternutkins]

Some progress. I have located the boost controller its behind the r/h headlight. There seems to be sufficient vacuum, as soon as you start it the lever on the turbo moves to the full boost position until you pass 2000 rpm then it drops back.

If I disconnect the solenoid I get no boost at all but if I remove both pipes and join then together thus bypassing the controller it will rev to 3000 rpm with full boost, in fact after I put it together it went to nearly 4000 but I'm not expecting it to last.

I can find no leaks on the hoses in fact with the controller bypassed it blows the intercooler pipe off if the clip is removed and there is a lot of air there, it blows your hand away if you try to stop it.

I haven't yet driven it with the boost valve bypassed but if it will do 3000 rpm on the road with boost that's all I need. The boost valve is keeping it down to 2000 rpm but it will reach 3000 with it bypassed so there must be something else that restricts it. Any ideas?

Thanks

Peter

 

[Steve@Avantgarde]

What are the fault codes?

 

[alexanderfoti]

Some progress. I have located the boost controller its behind the r/h headlight. There seems to be sufficient vacuum, as soon as you start it the lever on the turbo moves to the full boost position until you pass 2000 rpm then it drops back.

If I disconnect the solenoid I get no boost at all but if I remove both pipes and join then together thus bypassing the controller it will rev to 3000 rpm with full boost, in fact after I put it together it went to nearly 4000 but I'm not expecting it to last.

I can find no leaks on the hoses in fact with the controller bypassed it blows the intercooler pipe off if the clip is removed and there is a lot of air there, it blows your hand away if you try to stop it.

I haven't yet driven it with the boost valve bypassed but if it will do 3000 rpm on the road with boost that's all I need. The boost valve is keeping it down to 2000 rpm but it will reach 3000 with it bypassed so there must be something else that restricts it. Any ideas?

Thanks

Peter

It will do that for a very short time, until your turbo explodes into shrapnel. You cannot drive it with the wastegate/VNT vanes jammed closed/open

 

[peternutkins]

I have removed the bypass but even with it only stayed closed up to 2000 rpm. Since taking of the manifold inlet hose and it giving a very good blast of air I put it all back together and moved it into the yard and it will now do 4500 rpm, I don't expect it to stay like that but it will be interesting to see what happens when I take it out on the road.

Peter