P0301 Cylinder 1 misfire - Chevy Colorado & GMC Canyon

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Old 01-09-2011, 12:06 PM   #1 (permalink)
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Default P0301 Cylinder 1 misfire

Ok. so my truck is only throwing the code for cylinder one and i cant figure out why. all new plugs and the coils are seated properly. im not noticing any rough idles or anything of the sort but it seems to be robbing MPG's. I've kinda hit a wall on this one. Does anyone have any suggestions or similar experience?
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2004 Z71 Canyon SLE
3" shackles, TB crank, Diff drop, BJ flip, K&N CAI, air raid TBS, MBRP catback, BULLMAXX3, TAG multicarrier bumper, tire gate PR, 2 7" HID lights,2 4" HID lights, PCMforless, Scanguage II, 31x10.5 dick cepek mountaincats on 15x8 Ultra 50 wheels, GS racing seats.
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Old 01-09-2011, 10:50 PM   #2 (permalink)
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Default Re: P0301 Cylinder 1 misfire

There have been many comments that Cyc. 1 is the easiest to misseat the coil pack on. It maybe worth another look see. Maybe swap #1 and #2 coils over see if it moves the miss to # 2. Good luck
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Green "05 canyon ext cab, 3.5 auto, 2wd, belltech 2/2 drop , fake lake pipes, overhead console, scangauge, ARE tonnue cover, brushed pinstrips, de badged, helwig sway bars, H3 wheels.
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Old 01-15-2011, 12:33 PM   #3 (permalink)
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Default Re: P0301 Cylinder 1 misfire

I didn't know you could just swap coil packs. It's worth a try. If the misfire does switch to cyl 2 would that mean I have a bad coil pack?
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2004 Z71 Canyon SLE
3" shackles, TB crank, Diff drop, BJ flip, K&N CAI, air raid TBS, MBRP catback, BULLMAXX3, TAG multicarrier bumper, tire gate PR, 2 7" HID lights,2 4" HID lights, PCMforless, Scanguage II, 31x10.5 dick cepek mountaincats on 15x8 Ultra 50 wheels, GS racing seats.
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Old 01-23-2011, 02:49 PM   #4 (permalink)
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Default Re: P0301 Cylinder 1 misfire

ok. so i swapped out the coils and its still throwing the code for cylinder one. where does that leave me. any help would be awesome
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2004 Z71 Canyon SLE
3" shackles, TB crank, Diff drop, BJ flip, K&N CAI, air raid TBS, MBRP catback, BULLMAXX3, TAG multicarrier bumper, tire gate PR, 2 7" HID lights,2 4" HID lights, PCMforless, Scanguage II, 31x10.5 dick cepek mountaincats on 15x8 Ultra 50 wheels, GS racing seats.
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Old 01-23-2011, 04:07 PM   #5 (permalink)
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Default Re: P0301 Cylinder 1 misfire

that leaves you at probably the head issue get a leakdown test done and its covered to 100k miles by GM theres a TSB on it.
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Old 01-25-2011, 08:27 PM   #6 (permalink)
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Default Re: P0301 Cylinder 1 misfire

ok sorry im gonna need that in simple english lol. what exactly is a leakdown test? and what does TSB mean?
Also, the truck appears to be running fine beside throwing the code.. could this be some sensor i dont know about?
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2004 Z71 Canyon SLE
3" shackles, TB crank, Diff drop, BJ flip, K&N CAI, air raid TBS, MBRP catback, BULLMAXX3, TAG multicarrier bumper, tire gate PR, 2 7" HID lights,2 4" HID lights, PCMforless, Scanguage II, 31x10.5 dick cepek mountaincats on 15x8 Ultra 50 wheels, GS racing seats.
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Old 02-05-2011, 05:37 PM   #7 (permalink)
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Default Re: P0301 Cylinder 1 misfire

ok i did some recon and found the TSB. if this turns out to be my problem, does anyone know how much it will run me to get fixed?
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2004 Z71 Canyon SLE
3" shackles, TB crank, Diff drop, BJ flip, K&N CAI, air raid TBS, MBRP catback, BULLMAXX3, TAG multicarrier bumper, tire gate PR, 2 7" HID lights,2 4" HID lights, PCMforless, Scanguage II, 31x10.5 dick cepek mountaincats on 15x8 Ultra 50 wheels, GS racing seats.
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Old 02-22-2011, 02:22 PM   #8 (permalink)
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Default Re: P0301 Cylinder 1 misfire

What did you find out ? cylider 3 misfire . thinking leak down test . did you get yours fixed ? how much ? mine 147000miles out of warranty :(
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Old 02-22-2011, 11:37 PM   #9 (permalink)
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Default Re: P0301 Cylinder 1 misfire

I mine had a miss fire code, and was idling rough too. There is a service bulliten about the spings on the exhaust valve springs and it is covered to a 100,000 miles, bad thing was my truck had 130,000, it is a 2005. But don't let a dealer sell you a head to fix it, get a valve job done got 135. The deler charged me over 1800 dollars to take it apart and putnit back together, and when they could not fix it, they said it was an exhaust valve leaking, but i told them i wanted the head and had it fixed myself, itr was a intake valve sticking open.
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Old 02-23-2011, 12:31 PM   #10 (permalink)
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Default Re: P0301 Cylinder 1 misfire

my shop said 2 to 2400$ to repair ,includes sending head to machine shop to be rebuilt 550$rebuild head 1000$ labor 500$ materials
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