Seat 2.0 TDI CEGA - no boost

[squarehead94]

Weird one this.
Doing up a 2010 Leon fr TDI - turbo was blown. Replaced the core as the housing was fine. Cleaned the sump out, oil pick up etc. all back together, old fault codes cleared. Now in neutral on the ramps, it boosts ok - can hear the turbo kicking in. But drive it, and zero boost whatsoever. No fault codes, no flashing coil light etc. no smoke at idle (I expected some smoke due to residue oil in the exhaust when old turbo went bang) but pull away and it throws smoke out. As I say there's no diagnostic fault codes coming up either.

Any suggestions?

[E-bmw]

squarehead94 said:

pull away and it throws smoke out. As I say there's no diagnostic fault codes coming up either.

What colour of smoke?

[stevieturbo]

squarehead94 said:

Weird one this.
Doing up a 2010 Leon fr TDI - turbo was blown. Replaced the core as the housing was fine. Cleaned the sump out, oil pick up etc. all back together, old fault codes cleared. Now in neutral on the ramps, it boosts ok - can hear the turbo kicking in. But drive it, and zero boost whatsoever. No fault codes, no flashing coil light etc. no smoke at idle (I expected some smoke due to residue oil in the exhaust when old turbo went bang) but pull away and it throws smoke out. As I say there's no diagnostic fault codes coming up either.

Any suggestions?

it makes zero sense for a turbo to "kick in" at idle, or with no load on the engine. That's not how things work.

Datalog and see if it is making any boost, if it is even trying to make boost, etc etc etc

[E-bmw]

stevieturbo said:

squarehead94 said:

Now in neutral on the ramps, it boosts ok - can hear the turbo kicking in.

no smoke at idle but pull away and it throws smoke out. As I say there's no diagnostic fault codes coming up either.

it makes zero sense for a turbo to "kick in" at idle, or with no load on the engine. That's not how things work.

Datalog and see if it is making any boost, if it is even trying to make boost, etc etc etc

Just to be picky (sorry, not intentional ST) he didn't say it kicks in at idle but in neutral, although you are of course correct anyway that a turbo doesn't kick in, it is basically always spinning when the engine is running, and doesn't really do anything under no load apart from spin up.

Still need to know what kind/colour of smoke is there when under load obviously.