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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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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.
Gordon
2004 Chevrolet Silverado Extended Cab Z71
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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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Original Poster
whynott
Combustion on 1 piston [L2]
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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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Original Poster
whynott
Combustion on 1 piston [L2]
Combustion on 1 piston [L2]
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Joined: Nov 24 2011, 3:41am
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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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Original Poster
whynott
Combustion on 1 piston [L2]
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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.
Gordon
2004 Chevrolet Silverado Extended Cab Z71
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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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Original Poster
whynott
Combustion on 1 piston [L2]
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Posts: 107
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Joined: Nov 24 2011, 3:41am
Years of membership: 4 years of membership4 years of membership4 years of membership4 years of membership
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Extra Info: SLT Z71 4x4
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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.
Attachments
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IMAG0208.jpg
IMAG0209.jpg
IMAG0210.jpg
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Original Poster
whynott
Combustion on 1 piston [L2]
Combustion on 1 piston [L2]
Posts: 107
Topics: 7
Joined: Nov 24 2011, 3:41am
Years of membership: 4 years of membership4 years of membership4 years of membership4 years of membership
Location: South Georgia
Year: 2007
Make/Model: GMC Sierra
Variant: Hybrid
Extra Info: SLT Z71 4x4
Group Membership:
Registered users

Re: p0300 code...

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

Wow! Are they going to replace the whole motor?
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