Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Air Control Valve
With ignition turned off, check solenoid by connecting it directly to battery. If clicking sound is heard, solenoid is normal. Attach pressure gauge as shown in illustration and proceed as follows:
- Remove hoses from outlets "A" and "B". Start engine and run at idle. Check to see that pressure gauge reads 0.47 - 0.65 Ib./sq.in. (.033-.046 Kg./sq. cm.) and there are no air leaks from outlets "A" and "B".
- Increase engine speed to 3000 RPM. Pressure gauge should now read 1.3-2.0 lb./sq.in. (.11-.14 Kg./sq. cm), and air should be coming from outlets "A" and "B".
- Remove solenoid terminal. Pressure gauge should now read 0-.36 lb./sq.in. (0-.025 Kg./sq. cm), and air should flow from outlet "A" but it should not flow from outlet "B". Remove pressure gauge and connect hoses.
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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