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Misfire Cylinder 1 P0301

Misfire Cylinder 1 P0301

Postby heelsparky0501 [OP] » May 23 2011, 6:34pm

Hey guys,

Ive been having some issues with my sierra for about a week now.

It started with my check engine light coming on solid, not flashing. (The light never flashes, just stays solid). When i scan the code it reports P0301 cylinder 1 misfire detected and then P0301 misfire cylinder 1 *pending*

I dont really notice any difference driving, only at idle and below 1000 rpm. It idles rough and goes up and down by a few hundred rpm.
The light went off last nite while driving but then came back on this morning on my way to work. (for the first time)

Steps i have tried to solve the problem, all have failed,
- Erased code, reappeared within 15mi.
- Replaced all 8 spark plugs with denso double platinum @ .040
- Replaced all wires with an autolite performance set.
- Swapped new wires and new plugs between cylinder 1 and 3.
- Swapped the coil pack from 1 and 3.
- Ran 2 bottles of lucas injector cleaner through two tanks of gas.
- Cleaned the mass airflow sensor.
- Cleaned the inside of the throttle body.


Im not really sure what to do next, im kinda doubting its the intake leaking because wouldnt that cause the p0300 random misfire code?
The engine has 110K on it. An ran great until that light came on.

What should i do next? Do our injectors clog easily? Could a clogging injector even cause a misfire?

Truck is a 99 sierra nbs, only mods are a cai and flowmaster 10 series muffler.
Original Poster
heelsparky0501
Firing on 4 cylinders [L1]
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Related Topics  2008 Silverado 6.0 cylinder 7 misfire   Ignition Lock Cylinder Trouble   misfire   Cant get rid of misfire!   Need help! Nightmare misfire   4.8 random misfire, very weird idle   97 Silverado 5.7 low idle and misfire   P0300 Random Misfire Occuring Randomly   Misfire, backfireing, loosing power 5.7 K1500   Poor running, bad mileage and now a random misfire, too!   2005 silverado misfire, p0131 , p0300 , p0171 help please   Clogged Cat or Bad 02 Sensor? Random Misfire...   Intermittant Low Idle/Hard Start. No CEL, Misfire on scanner 
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Re: Misfire Cylinder 1 P0301

Postby A-Iron » May 24 2011, 3:28am

Hey Heel, I checked on line at "RepairPal.com".
Try this link http://repairpal.com/OBD-II-Code-P0301
Since you've swapped #'s 1 & 3 coils but still have the same problem, either power to the coil is not up to snuff or you could have a vacuum leak at this cylinder.
Hope this help's.

Greg
2011 Silverado LS Ext Cab
4.8 w/K&N Drop in filter
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Re: Misfire Cylinder 1 P0301

Postby dblakeman1972 » May 24 2011, 12:04pm

Check compression. I had the same thing, but on #4 and it ended up being a worn lobe on the camshaft! I hope thats not the problem, but good luck.
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Re: Misfire Cylinder 1 P0301

Postby heelsparky0501 [OP] » May 25 2011, 3:55am

dblakeman1972 wrote:Check compression. I had the same thing, but on #4 and it ended up being a worn lobe on the camshaft! I hope thats not the problem, but good luck.


Well I changed the fuel filter today and The light went off (knock on wood)

Hopefully it stays that way but we will see

How did you determine the lobe on the cam was at fault?
Original Poster
heelsparky0501
Firing on 4 cylinders [L1]
Firing on 4 cylinders [L1]
Posts: 47
Topics: 10
Blogs: 0
Joined: May 03 2011, 5:23pm
Years of membership: 3 years of membership3 years of membership3 years of membership
Year: 1999
Make/Model: GMC Sierra
Extra Info: 4.8L
Group Membership:
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Re: Misfire Cylinder 1 P0301

Postby heelsparky0501 [OP] » May 25 2011, 3:12pm

Nevermind, light is back on, bringing it to a shop today and I'll see what they say...
Original Poster
heelsparky0501
Firing on 4 cylinders [L1]
Firing on 4 cylinders [L1]
Posts: 47
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Joined: May 03 2011, 5:23pm
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Make/Model: GMC Sierra
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Re: Misfire Cylinder 1 P0301

Postby heelsparky0501 [OP] » May 26 2011, 5:30pm

Hey guys just wanted to come back and say the problem is solved.

It was indeed the injector :)

Thanks for the help everyone.
Original Poster
heelsparky0501
Firing on 4 cylinders [L1]
Firing on 4 cylinders [L1]
Posts: 47
Topics: 10
Blogs: 0
Joined: May 03 2011, 5:23pm
Years of membership: 3 years of membership3 years of membership3 years of membership
Year: 1999
Make/Model: GMC Sierra
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Re: Misfire Cylinder 1 P0301

Postby corvet3640 » May 26 2011, 6:59pm

Thanks for keeping us posted, glad it wasn't a worn lobe or missing piston or something crazy.
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