violent bucking when reaching 1 bar boost

bill bleiler b_ill78 at
Tue Sep 2 15:56:58 EDT 2003

hey guys, from the first day i had my 20v almost 2
years ago from time to time under high boost it would
violtenly buck once and when you let off and boosted
it back up again it was fine.  this has happend more
and more frequently, never knowing what it was i just
figured it was a weird thing and would be somthing i
would have to deal with.  Well last week i went ahead
and put a 3" exaust on with a 2.5 inch down pipe, then
this problem started to happen more frequently till
today whent it must have broke although i still dont
know what the problem whenever i get to
about 10 psi of boost it will buck violently if in
first, but if in higher gears and thus more momentum
it will just pulse rapidly with the boost dropping
about 2 lbs with each pulse...right now i am thinking
something with the wastegate...any other ideas....

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