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its not internal is it? valves not shut? causing the boost to leak out of the engine, and not hold the compression of the boost? does your boost go up higher, and lower down once u hit 4500 rpms or does it top out boost at 4500 rpm?
so I have this problem. Rocker cover is leaking but not bad. Put a boost guage in and this is what happens...
low Revs it boosts about .5 bar then as it hits about 3k it drops off to minus boost!!
can’t figure out what’s wrong. Only fault code I get and it’s the same all the time is p2177 system to lean off idle bank one 🤷🏼
