Problem with new truck

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by jb1234, Sep 4, 2007.

  1. jb1234

    jb1234 New Member

    I recently bought a 2003 Chevy Silverado 2500HD with the 6.0. I drive it home from the guy and when I get about 3/4 the way home a check engine light comes on. I scan it and a O2 sensor comes up so I clear the code and it stays off. The truck does have a Catback but it looks like it goes all the way up to the headers so I don't know if someone messed something up there. Then I leave the auto parts store after clearing the code and I go about 2 miles and the truck starts misfiring, so I go back and scan it and I have a multiple misfire code... the kicker is it does it like once or twice a day at random times, when I come to a stop it vibrates nice and good, then I drive a little ways and nothing. So, I bought an O2 Sensor and am unsure of the misfire problem. The plugs are new and the wires are too so I believe it is either Coil Pack, Fuel injector or something related to that system. Anybody have any suggestions? The truck has 111,000 miles on it. Thanks
  2. unplugged

    unplugged Epic Member 5+ Years 1000 Posts

    Beware of posers

    Unfortunately the 'misfire' code can be one of the more difficult to get to the bottom of. Check out for info on O2 sensor codes. Did you get a MAP sensor code too? That usually indicates a vacuum leak when accompanied with misfire codes. DTC codes are not a diagnosis they only give you a place to start looking. If you have a mechanic you trust, you may be better off having a shop take care of it. Beware of parts swappers posing as mechanics.

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