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 Cadillac Seville BaseFACTORY OEM SERVICE PROCEDURE
Torque Specifications
TORQUE SPECIFICATIONS
| Application | Ft. Lbs. (N.m) | ||||
|---|---|---|---|---|---|
| Catalytic Converter Hanger Bolts/Screws (Camaro & Firebird) | 37 (50) | ||||
| Center Support Bearing-To-Rear Axle Torque Arm Bolts (Camaro & Firebird With 2-Piece Driveshaft) | 37 (50) | ||||
| Driveshaft-To-Differential Yoke Bolt/Screw (Camaro & Firebird) | 16 (22) | ||||
| Fuel Tank Strap Bolts (Camaro & Firebird) | 25 (34) | ||||
| Harmonic Balancer (C3I) | |||||
| 3.3L & 3.8L | 200-239 (270-325) | ||||
| Ignition System | |||||
| DIS Module-To-Block Bolt (2.2L, 2.5L, 3.1L & 3.4L) | 15-22 (20-30) | ||||
| IDI Cover Assembly Bolt | 19 (26) | ||||
| Oxygen Sensor | 30 (41) | ||||
| PFI System | |||||
| Fuel Inlet & Return Line Nuts | |||||
| 2.0L | 20 (27) | ||||
| 2.3L, 3.3L, 3.4L & 4.9L | 22 (30) | ||||
| 3.1L | 17 (23) | ||||
| 5.0L & 5.7L | 20 (27) | ||||
| Fuel Rail Bolt | |||||
| 2.0L & 3.3L | 15-20 (20-27) | ||||
| 2.3L | 19 (26) | ||||
| 4.9L | 18 (24) | ||||
| 5.0L & 5.7L | 15 (20) | ||||
| Fuel Inlet Fitting (3.1L)(1) | 35 (47) | ||||
| IAC Valve (2.0L, 5.0L & 5.7L) | 13 (18) | ||||
| Intake Runner Bolts (5.0L & 5.7L) | 19 (26) | ||||
| Plenum Bolts | |||||
| 3.1L | 16 (22) | ||||
| 5.0L & 5.7L | 19 (26) | ||||
| Throttle Body Bolt | |||||
| 2.0L | 10-15 (14-20) | ||||
| 2.3L, 3.1L, 5.0L & 5.7L | 19 (26) | ||||
| 3.8L | 11 (15) | ||||
| 4.9L | 14 (19) | ||||
| Throttle Body Nut (3.3L) | 21 (28) | ||||
| Rear Axle Torque Arm Outer Transmission Bracket (Camaro & Firebird) | |||||
| Bolt | |||||
| Front Lower | 37 (50) | ||||
| Rear Upper | 20 (27) | ||||
| Nut | 30 (41) | ||||
| Rear Axle Torque Arm-To-Differential Housing Bolts/Nuts (Camaro & Firebird) | 97 (132) | ||||
| Rear Axle Track Bar Brace-To-Body Bracket Bolts (Camaro & Firebird) | |||||
| Left | 35 (47) | ||||
| Right | 80 (108) | ||||
| Rear Axle Track Bar-To-Left Coil Spring Seat Bolt/Nut (Camaro & Firebird) | 61 (83) | ||||
| Rear Axle Track Bar-To-Right Body Bracket Bolt/Nut (Camaro & Firebird) | 80 (108) | ||||
| Rear Exhaust Pipe Hanger Nut (Camaro & Firebird) | 16 (22) | ||||
| Rear Exhaust Pipe-To-Catalytic Converter Outlet Flange Bolts/Screws (Camaro & Firebird) | 15 (20) | ||||
| Rear Stabilizer Shaft Insulator Clamp Nuts (Camaro & Firebird) | 18 (24) | ||||
| Rear Stabilizer Shaft Link Bolts/Nuts (Camaro & Firebird) | 17 (23) | ||||
| Shock Absorber Lower Mounting Nut (Camaro & Firebird) | 70 (95) | ||||
| TBI System | |||||
| Fuel Inlet Fitting | 30 (41) | ||||
| Fuel Outlet Fitting (Model 220) | 22 (30) | ||||
| Fuel Outlet Fitting (Model 700) | 30 (41) | ||||
| Fuel Line Nut | 20 (27) | ||||
| Idle Air Control Valve (Model 220) | 13 (18) | ||||
| Throttle Body-To-Manifold Bolt | 18 (24) | ||||
| Wheel Lug Nuts (Camaro & Firebird) | 81 (110) | ||||
| INCH Lbs. (N.m) | |||||
| Ignition System | |||||
| Coil-To-Cover Screws (2.3L) | 35 (4.0) | ||||
| Crankshaft/Combination Sensor-To-Block Bolt | |||||
| 2.2L | 53-106 (6-12) | ||||
| 2.3L | 89 (10) | ||||
| 3.1L | 71 (8.0) | ||||
| Crankshaft Sensor-To-Module Screws (2.5L) | 20 (2.3) | ||||
| Ignition Coil-To-Module Screws (2.2L, 2.5L & 3.1L) | 41 (4.6) | ||||
| Module-To-Cover Screws (2.3L) | 35 (4.0) | ||||
| Muffler Hanger Retaining Bolts/Nuts (Camaro & Firebird) | 89 (10) | ||||
| PFI System | |||||
| Coolant Cover Screws | |||||
| 2.3L | 9 (1.0) | ||||
| 3.1L | 27 (3.0) | ||||
| Crossover Tube Retainer Bolt (5.0L & 5.7L) | 44 (4.9) | ||||
| Fuel Rail Bolt (3.1L) | 89 (10) | ||||
| Fuel Return Line Clamp Bolt (2.3L) | 53 (6.0) | ||||
| IAC Valve Housing (3.3L & 3.8L) | 27 (3.0) | ||||
| IAC Valve Retaining Screw (2.3L, 3.1L, 3.3L & 3.8L) | 18 (2.0) | ||||
| Pressure Regulator Base-To-Rail Bolt (5.0L & 5.7L) | 44 (4.9) | ||||
| Pressure Regulator-To-Bracket Bolts (5.0L & 5.7L) | 44 (4.9) | ||||
| TBI System | |||||
| Fuel Injector Screw (Model 700) | 27 (3.0) | ||||
| Fuel Meter Assembly Screw (Model 700) | 31 (3.5) | ||||
| Idle Air Control Valve Retaining Screw (Model 700) | 27 (3.0) | ||||
| Lower Throttle Body-To-Upper Throttle Body Screw (Model 220) | 35 (4.0) | ||||
| Throttle Body Cover Screw (Model 220) | 27 (3.0) | ||||
| Throttle Position Sensor Screw | 18 (2.0) | ||||
| Vacuum Tube Assembly Screw (Model 700) | 27 (3.0) | ||||
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Factory Service Tools
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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.