Accord L4-1955cc 2.0L SOHC FI (1987)
Throttle Opener: Testing and Inspection
Dashpot System Test
1. Check the vacuum line for leaks, blockage or a disconnected hose.
2. Disconnect # 6 vacuum hose from the dashpot diaphragm, and connect a vacuum pump/gauge to the hose.
3. Start the engine.
4. Raise engine speed to 3,500 rpm.
Vacuum should appear on gauge.
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If no vacuum, check that the vacuum port on the throttle body.
5. Release the throttle.
Vacuum should go out slowly.
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If the vacuum holds or goes out quickly, replace the dashpot check valve and re-test.
6. Connect a vacuum pump to the dashpot diaphragm.
7. Apply vacuum and check that the rod pulls in and vacuum holds.
The rod should pull in and vacuum should hold.
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If the vacuum does not hold or the rod does not move, replace the dashpot diaphragm and retest.