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 MANUALSFORD1991TAURUS L, 4D SEDAN, 3.8 4REPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 3.8LSOLENOIDSIDLE SPEED CONTROL (ISC) SOLENOID
1991 Ford Taurus L, 4D Sedan, 3.8 4
Idle Speed Control (ISC) Solenoid
1991 Ford Taurus L, 4D Sedan, 3.8 4SECTION Idle Speed Control (ISC) Solenoid
- Solenoid is by-pass air type solenoid. Ensure ignition is off. Disconnect ISC solenoid harness connector. Set DVOM to 200-ohm scale. Measure resistance between ISC solenoid terminals. See Fig 1 . There is a diode in solenoid, connect DVOM (+) test lead to VPWR terminal and DVOM (-) lead to ISC terminal.
- Resistance should be 7-13 ohms. If resistance is not within specification, replace solenoid. Faults in ISC solenoid or circuit should set a service code. See Quick Test procedure in the appropriate TESTS W/CODES article in this section. If no service code has been set, see CIRCUIT TEST KE in the appropriate TESTS W/CODES article for additional solenoid testing and specifications.
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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.