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Equipment & Gear => Power Equipment & RV => Topic started by: follow maggie on December 10, 2017, 10:48:14 AM


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Title: Intermittent misfire
Post by: follow maggie 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
Title: Re: Intermittent misfire
Post by: dewandgin 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:
Title: Re: Intermittent misfire
Post by: follow maggie on December 10, 2017, 11:51:55 AM
Thank you. I'm looking forward to taking care of this & getting my mileage back
Title: Re: Intermittent misfire
Post by: Buzz2401 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.
Title: Re: Intermittent misfire
Post by: jackelope on December 10, 2017, 01:47:58 PM
I don’t think that engine has plug wires.
Title: Re: Intermittent misfire
Post by: fishngamereaper on December 10, 2017, 01:52:55 PM
I don’t think that engine has plug wires.

It does and they suck to replace...the heat sleeves get baked to the wires...
Title: Re: Intermittent misfire
Post by: Crunchy 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.
Title: Re: Intermittent misfire
Post by: Buzz2401 on December 10, 2017, 02:17:35 PM
I don’t think that engine has plug wires.
I literally have exact same year and engine combo.  I assure you it has plug wires. 
Title: Re: Intermittent misfire
Post by: jackelope on December 10, 2017, 02:33:57 PM
Ya you’re right. My bad.  They’re the little short ones. Coil to plug. It’s been a while.
Title: Re: Intermittent misfire
Post by: coachcw 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 .
Title: Re: Intermittent misfire
Post by: follow maggie on December 16, 2017, 05:56:26 PM
Thanks coach. I’ll look for a vacuum leak tomorrow if it’s not raining.
Title: Re: Intermittent misfire
Post by: Calvin Rayborn on December 29, 2017, 12:16:16 AM
Front passenger on my Ford - always gotta be different!
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