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.
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HOMESERVICE MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 93 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS 4.6L)EMISSION SYSTEMS & SUB-SYSTEMSEXHAUST GAS RECIRCULATION (EGR)VACUUM CHECK VALVE
1991 Mercury Tracer Base, 4D Sedan, Automatic
Vacuum Check Valve
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Vacuum Check 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.
Apply and trap 16 in. Hg vacuum to check side of valve. If vacuum remains greater than 15 in. Hg for 10 seconds, valve operation is normal. If vacuum does not remain greater than 15 in. Hg for 10 seconds, replace valve.
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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.