Hot Engine
- Disconnect air suction lower hose at anti-afterburn valve. Start engine. Raise engine speed to 3500 RPM and quickly release. If there is vacuum at hose, test is complete.
- If there is no vacuum, check for voltage at anti-afterburn control solenoid valve (Green/White wire). If there is voltage, replace thermosensor and retest. If there is no voltage, replace anti-afterburn control solenoid valve and retest.