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 L4-153 2.5L HSCFACTORY OEM SERVICE PROCEDURE
Throttle Position Sensor
IDLE SPEED
Automatic Idle Speed Control Range 675-725 RPM
Throttle Plate Stop Screw
A/T 575-625 RPM
M/T 625-675 RPM
TORQUE VALUES
Fuel Charging Assembly to Intake Manifold 15-25 lb. ft. (20-34 N-m)
Fuel Fitting to Main Body 11-14 lb. ft. (15-19 N-m)
Fuel Pressure Regulator 27-35 in. lb. (3.1-3.9 N-m)
Injector Retaining Screws 18-22 lb. in. (2.0-2.5 N-m)
ISC Bracket to Throttle Body 31-44 lb. in. (3.5-5.0 N-m)
ISC Motor to Mounting Bracket 40-49 lb. in. (4.5-5.5 N-m)
Main Body to Throttle Body 27-40 lb. in. (3.0-4.5 N-m)
Throttle Position Sensor 11-18 lb. in. (1.2-2.0 N-m)
Throttle Body to Main Body 27-40 lb. in. (3.0-4.5 N-m)
Automatic Idle Speed Control Range 675-725 RPM
Throttle Plate Stop Screw
A/T 575-625 RPM
M/T 625-675 RPM
TORQUE VALUES
Fuel Charging Assembly to Intake Manifold 15-25 lb. ft. (20-34 N-m)
Fuel Fitting to Main Body 11-14 lb. ft. (15-19 N-m)
Fuel Pressure Regulator 27-35 in. lb. (3.1-3.9 N-m)
Injector Retaining Screws 18-22 lb. in. (2.0-2.5 N-m)
ISC Bracket to Throttle Body 31-44 lb. in. (3.5-5.0 N-m)
ISC Motor to Mounting Bracket 40-49 lb. in. (4.5-5.5 N-m)
Main Body to Throttle Body 27-40 lb. in. (3.0-4.5 N-m)
Throttle Position Sensor 11-18 lb. in. (1.2-2.0 N-m)
Throttle Body to Main Body 27-40 lb. in. (3.0-4.5 N-m)
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.