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.
2009 Hummer H3 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Exhaust System
- Specifications
- Diagnostic Information and Procedures
- Repair Instructions
- Exhaust Manifold Replacement (LLR)
- Exhaust Manifold Replacement - Left Side (LH9)
- Exhaust Manifold Replacement - Right Side (LH9)
- Exhaust Seal Replacement (LH8)
- Exhaust Seal Replacement (LLR)
- Catalytic Converter Replacement (LLR)
- Catalytic Converter Replacement - Left Side (LH8)
- Catalytic Converter Replacement - Right Side (LH8)
- Exhaust System Insulator, Hanger, Bracket Replacement
- Exhaust Muffler Replacement (LH8)
- Exhaust Muffler Replacement (LLR)
- Exhaust Muffler Replacement (LH8 EQ9/NA3)
- Exhaust Muffler Replacement (Pickup)
- Exhaust Muffler Rear Pipe Replacement (Pickup)
- Catalytic Converter Heat Shield Replacement (LH9,LLR)
- Exhaust Manifold Heat Shield Replacement (LLR)
- Exhaust Manifold Heat Shield Replacement - Right Side (LH8)
- Exhaust Manifold Heat Shield Replacement - Left Side (LH8)
- Exhaust Pipe Heat Shield Replacement
- Description and Operation
- Special Tools and Equipment
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.
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