[DrivenP&D]

Usually the problem on these vehicles for boost issues is a faulty boost pressure sensor or it may be the wastegate itself not properly closing via the wastegate actuator

 

[DrivenP&D]

So no leaks and boost sensor was replaced. Does the cel only appear at WOT? Do you feel a loss of power? And do you monitor your boost pressure?

 

[DrivenP&D]

Seems to me to be the actuator. The car is inconsistent with boost pressure. Some days im getting full boost some days only 5 or 6 psi woth no cel at times.
Just ordered the actuator so ill keep yall updated.

Yes keep us posted and good luck. It doesn’t hurt to replace the actuator as it is not expensive. It very well may be shot and not closing properly in order to build the proper pressure.

If it was a vacuum line leak your vehicle would stumble and not be able to idle properly. Any other type of boost leak, it would be audible and you would definitely be able to hear it under the hood.

You should invest in a vacuum/boost gauge. They have electronic gauges that connect plug and play via OBDII and use your sensors to display the vac and pressure.

 

[DrivenP&D]

Those lines don’t build pressure but you’ll want to fix them. It’s a common issue on the 45 due to how the engine cover sits so closely. It’s an easy fix, just take the cover off and where it snaps into place, take the Mount off and space them with a few washers so the when you snap the engine cover back on its raised a bit so it’s not forcing those lines to touch the aluminum. You’ll want to check to see if it’s just the shielding that got burned or if it went through the rubber hose.

 

[DrivenP&D]

So not the actuator, have you checked all your electrical connections and to the boost sensor? It sounds like it may be electrical. What remap or tune are you running?

 

[DrivenP&D]

You can also silver or gold wrap them like I did.

 

[DrivenP&D]

Ok. Do you have any smoke coming from your exhaust that you may not have noticed?

Without seeing the car, and seeing that you have gone through just about everything, it may just be your turbo going south. There really isn’t anything else for you to check and a boost leak from 26+ psi down to 4-5 would be audible.

 

[DrivenP&D]

There’s a bit of play. Your pic looks normal. Here’s a pic of mine to compare the adjustment. The arm isn’t rubbing on the turbo housing right?

 

[DrivenP&D]

Also does the end of your actuator rest on that lip where the nuts are located?
Mine moves past that lip and does not rest on it.

No it doesn’t. Yours is fine it shouldn’t rest on anything and must have free play back and forth

 

[DrivenP&D]

Would a loose wastegate flapper be the cause?
The area where the actuator connects to the turbo seems to have alot of play. Moves beyond stop point ( little lip on turbo)

Are you talking about the exhaust side of the turbo?

also you should be reading about 26 psi stock pressure. You are tuned so you should be reading a bit more.

 

[DrivenP&D]

Are you talking about the exhaust side of the turbo?

just following up. I think this is your boost issue. There shouldn’t be any play in the shaft where the wastegate connects to. I think the play is allowing the valve to slightly open.