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.
Symptom Chart: Symptom Chart - Exhaust System
Verify the customer concern. Inspect the components of the exhaust system for obvious signs of damage or other mechanical concerns using the following chart.
Visual Inspection Chart - Mechanical
| Mechanical |
|---|
| Exhaust pipe pinched or crushed Damaged muffler Broken or damaged exhaust hanger brackets Damaged catalytic converters Loose or damaged heat shields |
Verify the exhaust system is installed correctly, with clamps correctly located and tightened to specifications. If the fault is not visually evident, determine the symptom. GO to Symptom Chart below.
Symptom Chart
| Condition | Possible Sources | Actions |
|---|---|---|
| Vehicle has low or no power -- vehicle performance complaint | Exhaust pipe pinched or crushed Damaged catalytic converter Loose obstruction in exhaust |
REFER to Engine Controls - Symptom Charts (Except Diesel & Hybrid) . |
| Restricted exhaust (possible frozen condensate in muffler) | CHECK drain holes for foreign material. PARK the vehicle inside to thaw. TEST the vehicle for normal operation. If the concern is still present, REFER to Engine Controls - Symptom Charts (Except Diesel & Hybrid) . | |
| Burning smell -- usually occurs at idle, with possible traces of smoke | Foreign material caught in exhaust system Missing heat shields |
INSPECT the exhaust system for foreign material or missing heat shields. REPAIR or INSTALL new components as necessary. |
| Odor -- described as a sulfur or rotten egg smell | Catalytic converter Excessive sulfur content in fuel |
At times, a slight sulfur smell is normal for catalytic converters. The cause is the sulfur content in the gasoline being used. ADVISE the customer no repair is required. |
| Rich fuel conditions Misfire conditions |
REFER to Engine Controls - Symptom Charts (Except Diesel & Hybrid) . | |
| Visible rust on surface of exhaust pipes | Catalytic converter/exhaust system | Surface rust is a characteristic of materials used on exhaust systems. Exposure to heat or road salt may result in surface rust. INSPECT for perforations. If there are no perforations, the condition is normal. |
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.