Honda Acura NSX 1991 Service Manual page 294

Air Intake System
Testing
1. Check the vacuum line for leaks, blockage or a
disconnected hose.
2. Disconnect the vacuum hose from the dashpot
diaphragm, and connect a vacuum pump to the
hose.
VACUUM PUMP/G
- X X
3. Apply vacuum and check the speed the vacuum
goes out.
Vacuum should go out slowly.
the dashpot check valve and retest.
I I - 1 1 8
4. Connect a vacuum pump to the dashpot
phragm.
5. Apply vacuum and check that the rod pulls in and
vacuum holds.
move, replace the dashpot
retest.
dia-
diaphragm and