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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 93 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS 4.6L)EMISSION SYSTEMS & SUB-SYSTEMSSECONDARY AIR INJECTION (AIR)COMBINATION AIRB/AIRD VALVE
1991 Mercury Tracer Base, 4D Sedan, Automatic
Combination AIRB/AIRD Valve
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Combination AIRB/AIRD Valve
WARNING: This page is about a different car, the 1995 Lincoln Mark VIII. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect hoses from outlets "A" and "B". See Fig 1. Disconnect and plug vacuum line to port "D". With engine operating at 1500 RPM, airflow should come out of by-pass vents.
- Reconnect vacuum line to port "D". Disconnect and plug vacuum line to port "S". Ensure vacuum is present in line to vacuum port "D". Accelerate engine speed to 1500 RPM. Airflow should come out of outlet "B". Airflow should not be detected at outlet "A".
- Apply 8-10 in. Hg vacuum to port "S". With engine operating at 1500 RPM, airflow should come out of outlet "A". If valve is bleed type, less air will flow from outlet "A" or "B" and main discharge will change when vacuum is applied to port "S".
- If conditions in previous steps are not met, replace valve. If above conditions are met, valve is okay. Reconnect hoses and vacuum lines.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.