Mixture Control Solenoid: Testing and Inspection

Special Tools Required:
Vacuum pump gauge, 0-30 in.Hg A973X-041 -XXXXX

1. Start the engine. Hold the engine at 3,000 rpm with no load (transmission in Park or neutral position) until the radiator fan comes on, then let it idle.




2. Remove the vacuum hose (A) from the install pipe, and connect a vacuum gauge to the hose.
3. Raise and lower the engine speed, and make sure the vacuum gauge reading changes as the rpm changes.
If the vacuum reading does not change check for these problems:
- Misrouted, leaking, broken, or clogged FIA system vacuum lines.
- A cracked or damaged FIA control valve.