Intermittent misfire

[follow maggie]

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

[dewandgin]

It is the first cylinder on the drivers side. The farthest forward cylinder when you look at the front of the motor.

[follow maggie]

Thank you. I'm looking forward to taking care of this & getting my mileage back

[Buzz2401]

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.

[jackelope]

I don’t think that engine has plug wires.

[fishngamereaper]

I don’t think that engine has plug wires.

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

[Crunchy]

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.

[Buzz2401]

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. 

[jackelope]

Ya you’re right. My bad.  They’re the little short ones. Coil to plug. It’s been a while.

[coachcw]

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 .

[follow maggie]

Thanks coach. I’ll look for a vacuum leak tomorrow if it’s not raining.

[Calvin Rayborn]

Front passenger on my Ford - always gotta be different!