Rotten Egg Smell During Acceleration
A rotten egg (sulfur) smell when accelerating in a 2020 Chevrolet Silverado 1500 typically indicates a failing catalytic converter or a rich fuel mixture causing excess sulfur in the exhaust. This can also be caused by a malfunctioning oxygen sensor or fuel system issue.
Diagnosis Details
Possible Causes
Failing catalytic converter – internal damage or contamination prevents proper conversion of sulfur compounds, releasing hydrogen sulfide (rotten egg smell).
Rich fuel mixture – excessive fuel in the exhaust (due to faulty oxygen sensor, fuel injector leak, or high fuel pressure) leads to sulfur production.
Contaminated fuel – poor-quality or high-sulfur fuel can cause temporary sulfur smell, especially under load.
Related OBD-II Codes
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What You Should Do
Check for diagnostic trouble codes (DTCs) using an OBD-II scanner.
Inspect the catalytic converter for damage or clogging.
Test oxygen sensor readings and fuel trim values.
If no codes are present, try refueling with top-tier gasoline from a reputable station.
If the smell persists, have a professional inspect the exhaust system and fuel delivery components.
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.
