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.
2002 Chevrolet Impala LSFACTORY OEM SERVICE PROCEDURE
Engine Exhaust System: Specifications
Fastener Tightening Specifications
| Application | Specification | |
|---|---|---|
| Metric | English | |
| Catalytic Converter Bolt 3.8L | 45 N.m | 33 lb ft |
| Catalytic Converter Nut 3.4L | 34 N.m | 25 lb ft |
| EGR Adapter Pipe to Exhaust Manifold Bolt 3.8L | 29 N.m | 21 lb ft |
| Engine Lift Bracket Bolt/Nut | 30 N.m | 22 lb ft |
| Exhaust Crossover Pipe Bolt/Stud 3.8L | 20 N.m | 15 lb ft |
| Exhaust Crossover Pipe Heat Shield Bolt 3.4L | 10 N.m | 89 lb in |
| Exhaust Crossover Pipe Heat Shield Nut | 20 N.m | 15 lb ft |
| Exhaust Crossover Pipe Nut 3.4L | 25 N.m | 18 lb ft |
| Exhaust Manifold Bolt/Stud 3.8L | 30 N.m | 22 lb ft |
| Exhaust Manifold Heat Shield Bolt 3.4L | 10 N.m | 89 lb in |
| Exhaust Manifold Heat Shield Nuts 3.8L | 20 N.m | 15 lb ft |
| Exhaust Manifold Nut 3.4L | 16 N.m | 12 lb ft |
| Exhaust Manifold Pipe Stud Nut | 32 N.m | 24 lb ft |
| Exhaust Pipe Rear Hanger Bolt | 25 N.m | 18 lb ft |
| Fuel Injector Sight Shield Bracket Nut | 30 N.m | 22 lb ft |
| Rear Bumper Impact Bar Bolt | 25 N.m | 18 lb ft |
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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