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6 liter misfire!

my 04 with 120k has had a miss fire code recently need advice!!!

6 liter misfire!

Postby Babbitt180 [OP] » Oct 26 2012, 2:53am

my 2004 Chevy 2500hd 6.0l vortec recently put out a random misfire code.... so i was told by a buddy of mine to try plugs and wires first, so i did replacing them with brand new Bosch plugs and a Bosch wires, that worked for all of a day then a very slight misfire came back, along with the blinking engine light, the code again was the Po300 random misfire code, i was told i can try new coil packs next or new injectors both i guess are famous for causing misfire problems with these motors.....? just wanna get some other input on this problem maybe someone else had this issue?

Thanks
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Related Topics  2000 GMC Sierra 2500 with 5.7 liter vortec   Misfire causes?   misfire   2500 rpm misfire   PO300 misfire 05 2500HD   97 Silverado 5.7 low idle and misfire   Misfire, Reduced Engine Power   2008 Silverado 6.0 cylinder 7 misfire   Misfire, backfireing, loosing power 5.7 K1500   random misfire........2003 gmc 1500hd   o2, mass air, misfire codes after new exhaust...help!!   2005 silverado misfire, p0131 , p0300 , p0171 help please   Clogged Cat or Bad 02 Sensor? Random Misfire...   Poor running, bad mileage and now a random misfire, too! 
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Re: 6 liter misfire!

Postby Babbitt180 [OP] » Oct 27 2012, 12:19am

Babbitt180 wrote:my 2004 Chevy 2500hd 6.0l vortec recently put out a random misfire code.... so i was told by a buddy of mine to try plugs and wires first, so i did replacing them with brand new Bosch plugs and a Bosch wires, that worked for all of a day then a very slight misfire came back, along with the blinking engine light, the code again was the Po300 random misfire code, i was told i can try new coil packs next or new injectors both i guess are famous for causing misfire problems with these motors.....? just wanna get some other input on this problem maybe someone else had this issue?

Thanks
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Re: 6 liter misfire!

Postby vic401 » Oct 28 2012, 2:59pm

you need to get a crank relearn done with someone who has either a gm tech2 scanner or something similar, my truck also 04 2500hd(gmc) was having this problem i tried plugs wires and a few other things and nothing worked, after the re learn i havent had a problem or engine light yet, the guy i had do it was alomst trying to talk me out of it saying it wont work but it really does
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Re: 6 liter misfire!

Postby Babbitt180 [OP] » Oct 28 2012, 6:02pm

Alright I will give that a shot because nothing else like you said is working thanks!
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Re: 6 liter misfire!

Postby starspangled6.0 » Oct 28 2012, 6:28pm

I had the exact same issue... had the crank relearn done ($25 and 5 minutes of time :) ), and she's running smooth now!
07 Silverado 3500HD 6.6L Crew Cab Dually
04 Silverado 2500HD 6.6L Extended Cab w\Hiniker 8.5 V
03 Sierra 2500HD 6.0L Extended Cab w\BOSS 8.2' V


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