Combination Valve, Checking

Combination Valve, Checking

Special tools and equipment







- VAG1390 Hand Vacuum Pump

Test requirements:
- No leaks in vacuum lines or hose connections.
- Vacuum lines not clogged.







- Remove bolts (arrows) and remove engine covers -A- and -B-.







- Remove air distributor (arrows).

Leak test







- Pull hose from Secondary Air Injection (AIR) pump motor and blow in with light pressure (do not use pressurized air).
- Both combination valves must be closed, it must not be possible to blow through hose

If it is possible to blow through hose:
- Disconnect connecting line from Secondary Air Injection (AIR) pump motor to combination valve at one of the combination valves, close connecting line and blow through again.
- Replace combination valve remaining on connecting line

If it is no longer possible to blow through hose:
- Replace combination valve that was removed from connecting line

Functional check







- Remove vacuum hose of combination valve to be checked and connect VAG1390 vacuum pump to combination valve.







- Pull hose from Secondary Air Injection (AIR) pump motor and blow in with light pressure (do not use pressurized air).
- Operate hand vacuum pump.
- The relevant combination valve must open, it must not be possible to blow through

If the relevant combination valve does not open:
- Replace combination valve

If the relevant combination valve opens:
- Repeat function test at second combination valve.


NOTE:
- Use special tool 3231 and the Hazet carburetor adjustment key 4530.
- No special tools are necessary for the right combination valve.