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 DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 1.9LEMISSION SYSTEMS & SUB-SYSTEMSAIR INJECTIONTHERMACTOR IDLE VACUUM (TIV) VALVE
1991 Mercury Tracer Base, 4D Sedan, Automatic
Thermactor Idle Vacuum (TIV) Valve
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Thermactor Idle Vacuum (TIV) Valve
- With engine at idle and transmission in NEUTRAL, apply vacuum to small nipple and place fingers over the TIV valve atmospheric vent holes. See Fig 1 . If no vacuum is sensed, the TIV is damaged and must be replaced. If vacuum is sensed, go to next step.
- With engine still at idle, apply vacuum to TIV valve large nipple from using a vacuum pump. See TIV VALVE (LARGE NIPPLE) VACUUM SPECIFICATIONS . If vacuum is not held, the TIV is damaged and must be replaced. If no vacuum is sensed, replace valve.
TIV VALVE (LARGE NIPPLE) VACUUM SPECS
| TIV Decal Color Code | In. Hg |
|---|---|
| Ash | 5.1-10 |
| Red | 11.8-15.2 |
RENDER: 1.0x
NO RELATED
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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.