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Stl-986 · 07-17-2021, 07:28 PM

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.

07-17-2021, 07:28 PM	#34
Stl-986 Registered User Join Date: May 2017 Posts: 1,180	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. __________________ 2000 Boxster Tiptronic 2003 Boxster 2003 996 C2 Cab 2002 996 (SOLD) 1986 944 (gone but missed)