Bad smell coming from somewhere.

2002 GMC SIERRA
180,000 MILES
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TERRYG
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  • 1 POST
I have a rotten egg smell coming from the engine compartment. I can smell it through the vent while driving and when I park after I get out. What could cause this? I have heard a couple potential problems.
Jun 27, 2012 at 9:41 PM
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CARADIODOC
  • ✓ASE Certified Mechanic
  • 34,321 POSTS
  • ASE Certified Mechanic
That smell is coming from one of the catalytic converters, typically from a misfire that dumps raw fuel into the exhaust system.
Jun 27, 2012 at 10:26 PM
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DOCDTC
  • ✓ASE Certified Mechanic
  • 53 POSTS
  • ASE Certified Mechanic
Caradiodoc is right- can also be caused by leaking injector(s). If this is the case, it may not miss but may be hard to start, and will show a noticeable decrease in mpg.
Jun 27, 2012 at 11:11 PM
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