Hi all,
I have been trying to sort out my twin turbo which has boost issues. It doesn't boost at all on the secondary turbo and enters into limp mode (Code 66). What happens is as soon as it revs to 5k it hard cuts and throws a code. Gets full boost on the primary then start the change over then it feels like it dies off.
So far..
I've changed over the BBOD with another unit
Cleaned AFM with MAF cleaner
Check all vac lines are connected correctly
Removed turbos to check them for any damage
New spark plugs
Running out of ideas, thoughts?