Welcome to the site. First, how many miles are on it? What does the plug look like? Does it have a stock NGK plug? Any other plug will cause issues. Stock plugs need to be changed every 30,000 miles. Each cylinder has its own coil. It is possible that it may have a failing fuel injector. The injectors are easy to swap. You can move it to another location or replace it. Firing order is 1-3-5 driver side. 2-4-6 cylinders on passenger side.

 

I have the wrong cylinder first off so I cannot answer how the plug looks to be honest. I'll have to check the correct cylinder if I ever hope to fix the misfire lol. So there are two coils in one assembly for this engine? There are only 3 coil packs and all sit on the driver side atop cylinder 1/3/5 plugs. First thing I'm going to do now I have the right damn cylinder is pull the plug and look at it. That'll tell me if it's actually firing or not. Then i'll quickly check compression. If I have spark I'll perhaps swap the injectors. Do I have to pull the upper intake on this to get to the injectors? How the hell do you get the plugs off those particular injectors? I was playing in the dark by braille so perhaps it's more obvious in the day but it isn't like the bosch and lucas injector plugs I'm used to.

 

Each plug has its own coil pack. The engine has 6 total. The fuel rail run along the upper intake. It's held down by a few bolts. All you have to do is depressurize the line, unbolt the rail and lift up. All the injectors are held by a clip.
Use a 10 mm socket to unbolt the coil. Lift up on the coil. Some you have to turn a little to get them past the fuel rail. Then use an extension to reach the plug with a good socket. Use anti seize on plugs too. If water or debri get into the hole, they can ground the plug and give misfires too.

 

There definitely are only 3 coil packs on this 3.7L. So my question is does the coil fire each coil separately or does it fire both cylinders at the same time (Even if it's not on compression stroke AKA wasted spark system?) Anyone have a schematic to the coil? Curious how many wires go to the coil I'm going to assume this is two separate coils in one package each fired only on compression stroke by the ECM rather than a wasted spark type system. That would possibly explain why one cylinder may not be misfiring and the other cylinder on this coil assembly fires fine.

As you can see one coil sits atop 1/3/5 and then a lead feeds off this to each of 2/4/6.

 

Here is a video.

The number 6 is hardest to remove.

 

Can post a pic? I've never seen a cross fire coil pack. I've seen them before only to fire on exhaust stroke on opposite sides for emissions. What year is it?

 

2010 Nitro I posted a pic of what the coil looks like above. It's not for emissions as there won't be anything in the cylinder to burn or you'd have detonation.

Dave

 

Ford used 8 plugs on 4 cylinder engines(2000's). The extra plugs burned off exhaust gases. Firing was cross over from coil packs.

Wow! I didn't know Chrysler made such radical coil changes. It's the first I know about them. So a spark plug boot goes down to 2/4/6. Do wires go around the intake back side? Can you post an engine bay picture? Or email me a pic. I can post a pic for you.

 

Wow! It started in '09.

 

Can anyone answer my questions above?

Thanks
Dave

 

If you consider the electrical plug, I would assume it's a wasted spark system. Do you have a inline spark tester?
Harbor Freight has a cheap one. I use all the time when people call me and their vehicle does not start
http://www.harborfreight.com/inline-ignition-spark-checker-69014.html

I would connect one on the non coil side. Visually see how often it fires. I think you should easily tell if it's a wasted spark system. Spark count will be higher at idle than a normal 6 coil system.

 

Since the problem is on coil #3 cylinders 5/6, I would move it to 1/2 and run it. If the code moves to P0301, I would replace the coil pack.

 

Yes I understand that. I was asking if someone knows if this is a wasted spark system or two coils in one package. I would rather first understand how the system works rather than just swap things around. Also asked if anyone has a schematic to the injector so I can determine the above. As stated before I am ASSuming that there are two separate coils and it is NOT wasted spark as I'd ASSume that I'd get a misfire on 6 also then. I don't like to assume, rather know what I'm dealing with, hoping since this is a nitro specific forum maybe someone knows or has a service manual handy.

Thanks
Dave

 

Firing/exhaust is 180 off so I would assume wasted spark for exhaust gases. I have a factory manual but it's an '08. You need an '09 and later manual.

 

That's not necessarily true. Depends on firing order.