as far I understand, supras dont have pcv valves, instead they have a fixed orifice on the throtle body where that pipe leads to.... that orifice happens to get clogged often..it is recomended to remove the pipe at the throtle body and clean the hole/orifice with carburetor cleaner/trhotle body ceaner and use a small pick or something to open the hole. also make sure the pcv pipe is not clogged up with gum...
hope that helps..
|