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.
1991 Ford Taurus L4-153 2.5L HSCFACTORY OEM SERVICE PROCEDURE
Throttle Position Sensor
IDLE SPEED
The idle speed is computer controlled and a scan tool is required for adjustment. Refer to ADJUSTMENT PROCEDURES.
TORQUE VALUES
Accelerator Cable Mounting Bracket Bolts 10-15 lb. ft. (14-20 N-m)
Accelerator Pedal Attachment Nuts 10-15 lb. ft. (14-20 N-m)
Air Bypass Valve to Throttle Body 71-97 lb. in. (8-11 N-m)
Air Cleaner Adapter to Air Cleaner Lid 25 lb. in. (3.5 N-m)
Air Cleaner Assembly to Bracket Screw 36 lb. in. (4 N-m)
Air Cleaner Cover Screw 20-30 lb. in. (2.3-3.5 N-m)
Air Cleaner Outlet Tube Clamp 12-22 lb. in. (1.4-2.5 N-m)
Air Supply Tube Clamps 23-30 lb. in. (2.5-3.4 N-m)
EGR Tube 29.5-40.5 lb. ft. (40-55 N-m)
Fuel Filler Pipe Hose Clamps 25-33 lb. ft. (34-45 N-m)
Fuel Manifold to Fuel Charging Assembly 15-22 lb. ft. (20-30 N-m)
Fuel Pressure Regulator to Injector Manifold 27-40 lb. in. (3-4.5 N-m)
Fuel Pressure Relief Valve 48-84 lb. in. (6-10 N-m)
Fuel Pressure Relief Valve Cap 4-6 lb. in. (0.5-0.7 N-m)
Fuel Tank Straps Retaining bolts 21-29 lb. ft. (28-40 N-m)
Lower Intake Manifold to Head 12-15 lb. ft. (16-20 N-m)
Throttle Body to Upper Intake Manifold 12-15 lb. ft. (16-20 N-m)
Throttle Position Sensor to Throttle Body 25-30 lb. in. (2.8-3.4 N-m)
Upper Intake Manifold to Lower Intake Manifold Bolts 15-22 lb. ft. (20-30 N-m)
The idle speed is computer controlled and a scan tool is required for adjustment. Refer to ADJUSTMENT PROCEDURES.
TORQUE VALUES
Accelerator Cable Mounting Bracket Bolts 10-15 lb. ft. (14-20 N-m)
Accelerator Pedal Attachment Nuts 10-15 lb. ft. (14-20 N-m)
Air Bypass Valve to Throttle Body 71-97 lb. in. (8-11 N-m)
Air Cleaner Adapter to Air Cleaner Lid 25 lb. in. (3.5 N-m)
Air Cleaner Assembly to Bracket Screw 36 lb. in. (4 N-m)
Air Cleaner Cover Screw 20-30 lb. in. (2.3-3.5 N-m)
Air Cleaner Outlet Tube Clamp 12-22 lb. in. (1.4-2.5 N-m)
Air Supply Tube Clamps 23-30 lb. in. (2.5-3.4 N-m)
EGR Tube 29.5-40.5 lb. ft. (40-55 N-m)
Fuel Filler Pipe Hose Clamps 25-33 lb. ft. (34-45 N-m)
Fuel Manifold to Fuel Charging Assembly 15-22 lb. ft. (20-30 N-m)
Fuel Pressure Regulator to Injector Manifold 27-40 lb. in. (3-4.5 N-m)
Fuel Pressure Relief Valve 48-84 lb. in. (6-10 N-m)
Fuel Pressure Relief Valve Cap 4-6 lb. in. (0.5-0.7 N-m)
Fuel Tank Straps Retaining bolts 21-29 lb. ft. (28-40 N-m)
Lower Intake Manifold to Head 12-15 lb. ft. (16-20 N-m)
Throttle Body to Upper Intake Manifold 12-15 lb. ft. (16-20 N-m)
Throttle Position Sensor to Throttle Body 25-30 lb. in. (2.8-3.4 N-m)
Upper Intake Manifold to Lower Intake Manifold Bolts 15-22 lb. ft. (20-30 N-m)
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.
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