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  1. #1

    Default Problem with new truck

    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. #2
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    Unfortunately the 'misfire' code can be one of the more difficult to get to the bottom of. Check out aa1car.com 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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