Deceleration Valve
- Remove air cleaner. Remove and plug vacuum hose to air cleaner. Connect tachometer to engine. With engine at idle, remove deceleration valve signal hose from vacuum port.
- Reconnect signal hose to deceleration valve while listening for air flow through ventilation pipe into deceleration valve. Engine speed should drop when hose is reconnected.
- If airflow lasts less than one second or engine speed does not drop, check for defective hose(s) or deceleration valve.