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.
1989 Ford Probe GL, AutomaticFACTORY OEM SERVICE PROCEDURE
THERMACTOR Idle Vacuum (TIV) Valve
- Disconnect vacuum hoses from valve. Connect a manifold vacuum source to small nipple of the TIV valve. With engine at idle and in Neutral, test for vacuum at vent holes in valve housing. If vacuum is not present, valve must be replaced.
- With engine running and connected as in step 1), use a test source to apply vacuum within specified range to large nipple. See TIV VALVE VACUUM SPECIFICATIONS. If vacuum is present at vent holes, valve must be replaced. Disconnect test hoses and reconnect original hoses.
TIV VALVE VACUUM SPECIFICATIONS
| Application Color/Letters | Vacuum: In. Hg |
|---|---|
| Ash (Gray) | 1.5-3.0 |
| Red | 3.5-4.5 |
| TUR (Decal Code) | 1.5-2.5 |
Factory Service Tools
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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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