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Bad smell coming from somewhere.

Tiny
TERRYG
  • MEMBER
  • 2002 GMC SIERRA
  • 180,000 MILES
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.
Wednesday, June 27th, 2012 AT 9:41 PM

2 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,754 POSTS
That smell is coming from one of the catalytic converters, typically from a misfire that dumps raw fuel into the exhaust system.
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Wednesday, June 27th, 2012 AT 10:26 PM
Tiny
DOCDTC
  • MECHANIC
  • 53 POSTS
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.
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Wednesday, June 27th, 2012 AT 11:11 PM

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