Hot Engine: Carbureted
- Disconnect vacuum hose from EGR valve and connect vacuum gauge to hose. Start engine and warm to operating temperature (cooling fan comes on). EGR vacuum should respond as indicated in EGR VACUUM TEST
table. If vacuum is not as indicated in table, remove control box and open lid.
- If vacuum is present during condition No. 1, check vacuum hose routing and connections. Verify correct idle speed and mixture. Adjust as necessary.
- If no vacuum is available for conditions No. 2 and No. 4, check for vacuum at inlet thermovalve A (Accord) or cut-off solenoid (Prelude). If vacuum is present on Accord, replace thermovalve. If vacuum is present on Prelude models, proceed to EGR CUT-OFF SOLENOID
test.
- If vacuum was greater than 2 in. Hg for condition No. 3, replace EGR control valve (A/B). Ensure vacuum hoses are routed properly.
EGR VACUUM TEST
| Condition No. |
Operating Mode |
EGR Valve Vacuum |
| 1 |
Idle |
No |
| 2 |
3000 RPM |
2-6 in. Hg |
| 3 |
3000 RPM |
|
| 4 |
Hard Accel. |
2-6 in. Hg |
| 5 |
Deceleration |
No |