Question about 2003 Chevrolet Silverado Ss

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2003 Silverado rough idle, idles good after "check engine" light

My 2003 silverado idles very rough, and then the check engine light comes on. After the light comes on, it runs great and idles very smooth. Any ideas where to start looking?

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  • Anonymous Mar 13, 2014

    Missing and idles bad

  • Anonymous Mar 22, 2014

    The car idles rough. When you are at a stop the cars idle surges.the dashboard says check traction control ?

  • Anonymous Mar 25, 2014

    check engine light keeps coming off and on. there is also black residue around the equast tailpipe what could be the problems to these questions and would I go about fixing them and just what do I all need?

  • Anonymous Mar 28, 2014

    07 chevy classic 6.0 2500hd

  • Anonymous Mar 29, 2014

    rough idle

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Check your o2 sensor voltage, those trucks are real bad for o2 sensors, and yes if one sensor is reading 0mv, the others will start to drop out, and the vehicle will run very, rough. You also may check fuel system pressure, should be almost 60p.s.i. If its alot lower, Id be looking into a fuel pump. If that vehicle is drive-by-wire (no throttle cable), the throttle bodies get very dirty and cause that concern also. Id start by having the vehicle scantested.

Posted on Feb 07, 2009

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Your vehicle’s computer system has self-testing capability. When the computer senses that there is a problem with some of the components it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem. Your computer also stores history codes. Find out what codes are stored, this is the starting point.I have had 6 Silverados in the last month with a bad injector that caused all of the cylinders on one side of the engine to misfire.

Posted on Feb 02, 2009

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