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Old 04-25-2016
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Join Date: Apr 2016
Location: Picayune mississippi
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Cylinder missing

My 2000 ford ranger 3.0 v6 is running kind of poorly. I'm 99% sure that cylinder number 6 is missing. I replaced all the spark plugs and spark plug wires and it is still missing. I then unhooked the #6 spark plug wire from the co pack and it ran the same. But when I unplugged another wire it started running even more poorly. So I was wondering if anyone had any ideas as to what the problem is. I'm guessing the coil pack maybe??? Please help.
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Old 04-26-2016
uksparky's Avatar
Join Date: Dec 2015
Location: los alamos ca
Posts: 60
When you pull the plug wire on 6 can you see/hear the spark jumping from the wire to the plug...if yes do compression check on that cylinder...if not coil pack or wire..they updated it new part #...comp check if thats good above 140psi suspect injector....lower comp below 80psi could be valve problem..
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Old 04-26-2016
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Location: Vancouver, BC
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Welcome to the forum

Pulling spark plug wire on Coil Pack systems doesn't always tell you much.
The V6 coil pack only has 3 coils inside, cylinders #2 and #6 SHARE a coil.
As do 3 and 4, and 1 and 5
Hence the coil packs spark plug wiring
[3 4]
[2 6]
[1 5]

This is called a Waste Spark system, used in single cylinder magneto 4-stroke engines since early 1900's

Anyway because 2 spark plugs are firing at the same time you can Reverse the #2 and #6 spark plug wires on the coil pack if # 6 now works and #2 doesn't then yes it is a coil pack issue.

When you changed spark plugs #6 should have been a different color than the other 5 if it was misfiring.
Was it?

If so then check it again, clean it and the swap #2 and #6 wires on coil pack.
Run engine and see if #2 now shows the misfire color.

Engine gasoline runs on 3 things
1. Spark, at the right time
2. Fuel, mixed with correct amount of air
3. Compression, above 120psi

I use an old spark plug to check spark, hook up the spark plug wire and ground the plug, I use a Jumper cable to hold plug, other end connected to battery ground.
You need a blue-white spark, yellow means weak spark.

To check fuel, I disable the coil, unplug its connector
Crank engine a few times, then pull out the spark plugs
They should be wet with fuel, if one is dry then fuel injector issue.

Compression is actually the first thing I check because it can't be intermittent, you either have compression or you don't.
You can chase you tail around with spark and fuel when you had a compression issue all along, lol.
So if you test it first then it is off the table and you can know spark or fuel is the issue.
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