Question about 2003 Chevrolet Silverado 1500

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I Have a 2003 silverado, 5.3. it idels low. code shows random misfires. engine light flashes, it smokes when you run it hard like its getting to much gas.

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Check the spark plugs just pull one on each side i bet you will find one very black and the other very clean if this is the case on the side you find a dirty one they all will be dirty. now to fix this you will have to replace both of the o2 sensors on that bank Chevy has an issue that when an o2 sensor goes bad or is shorted due to water entering the connection and the computer doesn't know how to control the fuel per that bank.after you do this you will have to drive it hard to clean out the carbon in the cats after a few trips it will clean up i have been there with three chevys.

Posted on Nov 15, 2010

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Possible injector issue. If you can get at the injector wire harnesses... while at idle, unplug one at a time, and if it stalls, this injector is good, if you have no change, that cylinder has an issue. (Could also be spark)

Posted on Nov 15, 2010

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I have a 2000 Dodge Stratus with a random misfire on 1,3 and 5. The engine runs fine besides a twitch in the motor that can be felt while idling. Already replaced plugs and wires. Suggestions?


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Is this correct, you have a silverado 1500 2004 that runs rough and black smoke out of exhaust, the check engine light on and how long has engine light been on?

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There are few possibilities that can cause engine misfire issues. It can be issue with spark plugs or faulty spark plugs. Also get the compression test done for cylinders. If any of cylinder shows low compression then required, then that particular cylinder will cause misfire.

Also get obd codes scanned, the error code will let you know which cylinder is misfiring or all cylinders are misfiring.

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For your trouble shooting I suggest you to refer the help oinks below. It has step by step details for many engine misfire issues.

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Click the link below:-----


Ford Explorer Cylinder Misfire?

http://whoisbyme.blogspot.in/2012/06/ford-explorer-cylinder-misfire.html

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Engine Misfire codes on Chevrolet Malibu?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html

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Cylinder 6 Misfire?

http://howtobyme.blogspot.com/2011/12/cylinder-6-misfire.html

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Misfire on cylinder 4?

http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html

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http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html

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http://schematicsdiagram.blogspot.in/2012/02/can-cylinder-misfire-damage-catalytic.html

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http://technoanswers.blogspot.com/2012/01/car-misfires-and-error-code-p0306-and.html

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http://whatisbyme.blogspot.in/2012/04/1995-toyota-ls-misfire-at-idle-or-low.html

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This will help.

Thanks.

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Check for vacuum leak.Check all vacuum hoses and especially around the intake manifold these motos are prone for intake gaskets leaking.This will cause a code P0300.HOPE THIS HELPS!!

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My 2003 Chevy Silverado 2500 4x4 check engine light flashes randomly and different number of flashes each time like some sort of code is this posible?


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2005 chevy silverado v8, some hesitation, rough idling, ses light on and sometimes flashes. black smoke when reving the engine.


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