Going to use my 03 as a test tomorrow.
1st test - disconnect check valve from plenum & connect vacuum gauge. Get reading. If reading is in the 20's I'll do the next step
2nd test - Plug line from flapper to change over valve, take reading. If low, next step.
3rd test - remove rear plenum with flapper and install on 00 car. Disconnect check valve & connect vacuum gauge. If reading is still too low wait for engine to cool down and then replace bank 1 intake gaskets. Take reading again. If low, replace bank 2 intake gaskets and take readings again.
Keep the idea's coming.
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2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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