Rotten Egg Smell During Acceleration
A rotten egg (sulfur) smell when accelerating typically indicates a rich fuel mixture causing the catalytic converter to overheat and emit hydrogen sulfide. This can be due to a failing catalytic converter, fuel system issues, or engine misfires.
Diagnosis Details
Possible Causes
Failing catalytic converter – internal damage or clogging causes inefficient conversion and sulfur smell.
Rich fuel mixture – faulty oxygen sensor, fuel injector leak, or fuel pressure regulator causes excess fuel.
Engine misfire – unburned fuel enters the catalytic converter, overheating it.
Low-quality fuel – high sulfur content in fuel can produce the smell.
Related OBD-II Codes
Not satisfied with this diagnosis?
Try Another DiagnosisWhat To Do Next
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 sensors and fuel trim readings.
Verify fuel quality and consider using a fuel system cleaner.
If the smell persists, have a professional inspect the exhaust and fuel systems.
Share this diagnosis
Help others with similar symptoms
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.
