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.
1990 Ford Taurus SHOFACTORY OEM SERVICE PROCEDURE
Boost Pressure Check
- With engine cool, disconnect air hose from turbo boost control solenoid valve on turbocharger. Connect vacuum/pressure gauge to control solenoid.
- Start engine and allow it to warm-up to normal operating temperature. Increase engine speed to 4000 RPM. If gauge reads any positive pressure above zero, perform OVERBOOST WARNING CHIME CHECK. If gauge does not read any positive pressure above zero, perform TURBO BOOST CONTROL SOLENOID VALVE CHECK.
Factory Service Tools
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.