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p0300 code...

p0300 code...

Postby whynott [OP] » Dec 12 2011, 7:03am

Throwing a miss fire code. It only seems to happen when it goes into 4 cylinder mode. It will clear itself and randomly come back.
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Related Topics  P0300 code   P0300 Code with Two Cylinders Misfiring   03 Silverado 5.3 dreaded p0300 code   P0300 help!   P0300   In need of help with a p0300   Code P0141 Bank 1 Sensor 2 o2 sensor throwing code   p0300 diagnosis   P0300,p0171,174   P0300 flashing at 2100 RPM - Out of things to fix!   2005 silverado misfire, p0131 , p0300 , p0171 help please   P0449 code   Trouble code help   p0303 code help 
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Re: p0300 code...

Postby lzn197 » Dec 12 2011, 4:50pm

You may have to find a friend who has access to a scan tool. With the scan tool installed, Drive the vehicle under various conditions and monitor each cylinder for missfire.
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Re: p0300 code...

Postby whynott [OP] » Dec 13 2011, 6:24pm

So it stopped raining here in south Georgia so I did a little investigating. I found a little oil seepage near and around #6 coilpack and wire. I ordered a new coilpack and will be getting plugs and wires when the coilpack gets here. In the mean time not much driving for me.
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p0300 code...

Postby Bigredchev » Dec 13 2011, 9:53pm

P0300 is a random misfire code. This means it is seeing a misfire in random cylinders. I would look for a common denominator, such as fuel delivery or intake leak, if the plugs and wires don't help!
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Re: p0300 code...

Postby whynott [OP] » Dec 15 2011, 2:54pm

So I changed plugs and wires with no change. Took it to the dealer, they checked the gap of the plugs that's was good, checked coil packs those were good, did compression check and #5 failed. I'm still under 5 years, 100,000 miles so they are ripping it apart and my Axels are slinging grease and they replacing those too and its all under warranty. Glad it happened at 85,000 and not 105,000.
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Re: p0300 code...

Postby whynott [OP] » Dec 20 2011, 4:25pm

So I went to the dealer today and looked at my truck to find it in pieces. My hood was in the bed of the truck, my front tires deflated, half of my exhaust on the shop floor, tranny and transfer case sitting on a bench next to my heads, and a cherry pickers connected to the 5.3 ready to be pulled. Something tells I'm not getting my truck anytime soon.
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Re: p0300 code...

Postby lzn197 » Dec 20 2011, 4:31pm

That seems odd to totally remove the powertrain to change or repair an engine. That Mechanic is going to get shafted on flat rate. Work 25 hours for 9 hours pay. Sheesh.
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Re: p0300 code...

Postby whynott [OP] » Dec 20 2011, 5:22pm

They still don't know what's wrong with it.
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Combustion on 1 piston [L2]
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Re: p0300 code...

Postby whynott [OP] » Dec 20 2011, 9:32pm

Motor is ripped apart. #5 and #7 pistons had broke pieces. So that's that so far.
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Original Poster
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Combustion on 1 piston [L2]
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Extra Info: SLT Z71 4x4
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Registered users

Re: p0300 code...

Postby starspangled6.0starspangled6.0 is online! » Dec 20 2011, 9:45pm

Wow! Are they going to replace the whole motor?
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