Definately check all the joins in your piping, as well as the pipes for any leaks. They are not easy to spot. Also try checking the intake, check the air filter, make sure there is nothing stuck in your cold air feed.
It is possible that the ABV or the VSV for the ABV is getting stuck and allowing some boost to vent.
it is always a good idea if you have the original i/c to give it a good flush out with thinners to remove any built-up oil residue etc. that gets sucked through the system via the cam cover.
it has also been documented on a site i once read (i wouldnt know where the link was to it now) that boost can escape back into the inlet track via the s/c crankcase ventialtion system (ACV).
they fixed this by taking the air control valve that resides on the top of the s/c. then just joining the three vent lines together. i had this done on my s/c for 2 years with-out any problem occuring to the s/c.
GZE losing boost.
Thu, 23 October 2003 00:37
it is always a good idea if you have the original i/c to give it a good flush out with thinners to remove any built-up oil residue etc. that gets sucked through the system via the cam cover.