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Author Topic: Intermittent misfire  (Read 489 times)

Offline follow maggie

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Intermittent misfire
« on: December 10, 2017, 10:48:14 AM »
So my pickup has an intermittent misfire on cylinder #1. I know this because the Chevy shop scanned the codes for me while the transmission was being serviced.  I know how to fix it, what I don't know is how to find which cylinder is #1. The truck is a 2004 Chevy 2500hd with the 8.1L. It still runs strong, but I noticed a pretty big drop in mileage when I was hunting in North Dakota a few weeks ago.

I appreciate any help.

Grant

Offline dewandgin

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Re: Intermittent misfire
« Reply #1 on: December 10, 2017, 11:22:51 AM »
It is the first cylinder on the drivers side. The farthest forward cylinder when you look at the front of the motor. :tup:

Offline follow maggie

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Re: Intermittent misfire
« Reply #2 on: December 10, 2017, 11:51:55 AM »
Thank you. I'm looking forward to taking care of this & getting my mileage back

Offline Buzz2401

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Re: Intermittent misfire
« Reply #3 on: December 10, 2017, 12:46:49 PM »
Mine started doing that to and found out it was the original plug wires were coming off of the plug. I guess after 13 years its time for a new set.

Offline jackelope

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Re: Intermittent misfire
« Reply #4 on: December 10, 2017, 01:47:58 PM »
I donít think that engine has plug wires.
:fire.:

" In today's instant gratification society, more and more pressure revolves around success and the measurement of one's prowess as a hunter by inches on a score chart or field photos produced on social media. Don't fall into the trap. Hunting is-and always will be- about the hunt, the adventure, the views, and time spent with close friends and family. " Ryan Hatfield

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Online fishngamereaper

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Re: Intermittent misfire
« Reply #5 on: December 10, 2017, 01:52:55 PM »
I donít think that engine has plug wires.

It does and they suck to replace...the heat sleeves get baked to the wires...

Offline Crunchy

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Re: Intermittent misfire
« Reply #6 on: December 10, 2017, 02:15:30 PM »
Shouldn't be too hard, I did mine on my 04 Chevy half ton.  I'd look at swapping the coil with the cylinder #3 before I did threw too many parts at it.  if the misfire follows then it is obviously the coils that need to be replaced.  If not, then plugs and wires are in order.

Offline Buzz2401

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Re: Intermittent misfire
« Reply #7 on: December 10, 2017, 02:17:35 PM »
I donít think that engine has plug wires.
I literally have exact same year and engine combo.  I assure you it has plug wires. 

Offline jackelope

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Re: Intermittent misfire
« Reply #8 on: December 10, 2017, 02:33:57 PM »
Ya youíre right. My bad.  Theyíre the little short ones. Coil to plug. Itís been a while.
:fire.:

" In today's instant gratification society, more and more pressure revolves around success and the measurement of one's prowess as a hunter by inches on a score chart or field photos produced on social media. Don't fall into the trap. Hunting is-and always will be- about the hunt, the adventure, the views, and time spent with close friends and family. " Ryan Hatfield

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Offline coachcw

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Re: Intermittent misfire
« Reply #9 on: December 15, 2017, 06:16:54 AM »
for sure look at the ignition system . ignition misfires are sharp . if it only misfires at idle and kinda lopes check for vacuum leaks and cylinder leak down .I've seen quite a few ring issures on the newer gms. 25% will cause a missfire code .
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Offline follow maggie

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Re: Intermittent misfire
« Reply #10 on: December 16, 2017, 05:56:26 PM »
Thanks coach. Iíll look for a vacuum leak tomorrow if itís not raining.

Offline Calvin Rayborn

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Re: Intermittent misfire
« Reply #11 on: December 29, 2017, 12:16:16 AM »
Front passenger on my Ford - always gotta be different!