Vehicle Misfiring

41,000 MILES • V8 • 4WD • AUTOMATIC
Avatar
PENNY2006
  • MEMBER
  • 1 POST
2004 gmc 5.3 misfireing cyl 1/3/5/7 smail like eggs
Nov 29, 2010 at 5:28 PM
Advertisement
Avatar
ERNEST CLARK
  • ✓Experienced Mechanic
  • 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 29, 2010 at 5:36 PM
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Frequently Asked Problems for This Vehicle