Vehicle Misfiring

2004 GMC SIERRA
41,000 MILES • V8 • 4WD • AUTOMATIC
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PENNY2006
  • MEMBER
  • 1 POST
2004 gmc 5.3 misfireing cyl 1/3/5/7 smail like eggs
Nov 30, 2010 at 1:28 AM
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ERNEST CLARK
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 1,730 POSTS
An ignition misfire may be causeing raw fuel to be dumped into your exhaust system, which in turn will light off the cat converter. Your "Egg" smell is a sure sign the cat is fouled or fouling.

Have the plugs, wires and coils checked. Hopefully your cat isn't completely fouled. If so, you'll have to replace that as well.
Nov 30, 2010 at 1:36 AM
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