Hot Engine

Mixture Control System Test

HOT ENGINE
1. Disconnect the air suction lower hose at the anti-afterburn valve.





2. Start the engine and quickly raise the engine speed to 3,500 rpm and close the throttle suddenly.

There should be no vacuum.

- If there is vacuum, replace valve and retest.
- If there is vacuum go on to step 3.





3. Check for vacuum at idle.

There should be no vacuum.

- If there is vacuum, replace the anti-afterburn valve and retest.