It appears I have a blown gasket between the block and exhaust manifold; that and a lot of loose bolts holding the manifold to the head too.
I have a strange problem with the car where the turbo seems to have a very hard time generating a steady flow of boost. It is not surging or a boost leak because I have pressure tested and found none.
I have replaced both manifold to turbo gasket and turbo to downpipe gasket within the last two weeks. Both were blown.
I have read about the symptoms for a manifold to turbo gasket gone and I can only imagine the head to manifold one creating the same problems, although the search feature did not answer that for me.
My guess is that back pressure between the head and turbo are such that under heavy load pressure is lost and the rest follows.
I would really appreciate some first hand experience with this since it appears I will have to dish out some cash to have my mechanic do this for me. I don't have the tools to do this conformtably.
The current problems I am having right now are: erratic boost. Its better with engine cold, sucks when warm. super slow spool up time. again. temperature makes a difference. Car bucks slightly. I have bad gas mileage and low power all around. It also seems to drive the N75 valve crazy. Almost feels like the duty cycle is out of wack, although I don't have logs to show it.
Can a simple gasket really be the reason for all these problems?