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 MANUALSBUICK1991CENTURY L4-151 2.5L VIN R TBIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSSPECIFICATIONSMECHANICAL SPECIFICATIONS
1991 Buick Century L4-151 2.5L VIN R TBI
Mechanical Specifications
1991 Buick Century L4-151 2.5L VIN R TBISECTION Mechanical Specifications
Fuel lines to TBI body 27 N-m (20 lb. ft.)
Fuel inlet/outlet nuts to throttle body 41 N-m (30 lb. ft.)
Idle Air Control Valve (IAC) screws 3.0 N-m (27 lb. in.)
TBI attaching bolts 25 N-m (18 lb. ft.)
TPS attaching screws 2.0 N-m (18 lb. in.)
Injector retainer 3.0 N-m (27 lb. in.)
Pressure regulator cover 2.4 N-m (21 lb. in.)
Fuel meter body to throttle body 3.5 N-m (31 lb. in.)
Tube module assembly 3.0 N-m (27 lb. in.)
Engine compartment fuel pipe nuts 30 N-m (22 lb. ft.)
Front fuel tank retaining strap bolts 31 N-m (22 lb. ft.)
Rear fuel tank retaining strap bolts 12 N-m (108 lb. in.)
Fuel inlet/outlet nuts to throttle body 41 N-m (30 lb. ft.)
Idle Air Control Valve (IAC) screws 3.0 N-m (27 lb. in.)
TBI attaching bolts 25 N-m (18 lb. ft.)
TPS attaching screws 2.0 N-m (18 lb. in.)
Injector retainer 3.0 N-m (27 lb. in.)
Pressure regulator cover 2.4 N-m (21 lb. in.)
Fuel meter body to throttle body 3.5 N-m (31 lb. in.)
Tube module assembly 3.0 N-m (27 lb. in.)
Engine compartment fuel pipe nuts 30 N-m (22 lb. ft.)
Front fuel tank retaining strap bolts 31 N-m (22 lb. ft.)
Rear fuel tank retaining strap bolts 12 N-m (108 lb. in.)
RENDER: 1.0x
NO RELATED
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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.