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My 2000 chevy silverado has ap0300 misfire code , how do i fix ti

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P0300....Random/Multiple Cylinder Misfire Detected

so its got a misfire and quickest way out here to avoid a expensive garage visit is to change plugs and Ht leads and see what happens ,HT leads is proper english for fire wires by the way ,see iam learning american ---slowly---

Posted on Mar 12, 2011

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Hi.

The P0300 trouble code indicates that there is random misfire. The problem can be given by a number of different faults. First check if there are more diagnostic codes stored in the PCM.

If you get only P0300, check spark plugs, distributor (or, depending on ignition system check distribution coils) and high voltage wires from distributor to spark plugs. Those are the most common cause for random misfire.

If distribution is OK, check for ignition problems. A too rich or too lean mixture can result in misfire. Often the problem is not reported by the PCM with a lean or rich code based on the O2 sensors' input.
Check fuel system, injectors, filter and sensors in air intake and air intake itself, vacuum system etc.

Pay particular attention to the EGR system, that is a common fault resulting in random misfire.

P0300 is usually accompanied by symptoms such as engine running rough or shutting down. There are more faults, apart the ones listed that can return a P0300 code.

Posted on Mar 12, 2011

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I don't have a solution but I can tell my story on code P0300. What I have replaced so far that did not fix the misfire problems are 1. EGR valve, 2. throttle position sensor, 3. Idol air control valve, 4. The rear crank position sensor, 5. the control module under the coil packs, and 6. the fuel filter. So far it seems to run a little better when I unplug the EGR valve but that is only temporary. I still have the stumbling random misfire but not all the time. It comes and goes. Currently it will run smooth and strong for a while, maybe 10 miles or so, then it just looses power. When I back off the gas it smooths out a bit then as I accelerate again it misfires all over the place with the tach jumping up and down. It will do this sometimes for a few seconds to a few minutes then smooth out and run strong and smooth again. The a mile or so down the road it will misfire again all over again. Sometimes it goes for 30 miles without a misfire at all. I have to question how the cat could cause this issue as mentioned in the list of possible causes.

Posted on Apr 24, 2012

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