Question about 2003 Chevrolet Silverado 1500

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03 check engine light

I have a 03 silverado 1500 with the 5.3 engine. My idle seems to be any were from 1000rpms to 1200 for the first 5 or 10 minutes when first started. I have a check engine light that comes and gos as well. I have recently ran a can of "sea foam " through with no improvement.Excelleration is fine,gas milege is fine,just erractic idling and of course the check engine light!! any thoughts with matter would be greatly appreciated. Mike

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  • Jacket Fan Jan 09, 2009

    I have an 03 Suburban. I have the same rough idling only when the temp drops below about 40. Check engine lite comes on and off with the temp and the idle problem (codes 171 and 174). I have changed plugs, fuel filter, cleaned injectors, replaced air filter, cleaned the MAF and cleaned the throttle body myself (keeping it on the truck). None of this has fixed the cold idle issue, although the truck is running well in warm weather. I have read several threads about cleaning the Idle Air Control Valve. I haven't done that yet or figured out exactly where it is located. Any help appreciated.

  • wilc4087 Mar 01, 2009

    Rough idle on '03 4.8l silverado in cold weather. recently it has gotten worse to the point that when in place tranny in gear, RPM will go to 200 or less. The truck has started to cut-off when i come to a stop now. havent checked for vaccum leaks, though i feel that could be the culprit. also the idle air control valve. would replacing this be beneficial or would a cleaning to the trick?



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Try cleaning the throttle body really well to see if that dosent may have to take if off the truck to get it really clean but that sounds like what you may need to do

Posted on Jan 08, 2009


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Why does my 2006 chevy silverado 1500 5.3 ltre have an uneven idle when running and in park. no check engine light.

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I would suspect a faulty EGR valve, but is the check engine light on? If it is, take the vehicle to an autoparts store and have them use a scan tool to retrieve the fault code(s) stored in the computer. Most parts stores offer this service free of charge. That will narrow the search for the problem. Sure hope this helped.

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