That was my thinking, too, and why I tried the free troubleshooting step of swapping coil packs around. It seems the previous owner of my LR3 had 3 coil packs replaced. (On my vehicle the new ones have the same connector but the visible plastic lump is smaller than the original so there was some kind of design change.) I experienced 3 more failures of original (larger) coil packs and replaced the last 2 originals proactively.

I think I'll replace all 8 the next time they start to fail. I'm tempted to remove the plastic decor cover since I am sure it traps engine heat which may cook electronics directly underneath. Has anyone ever removed the plastic cover long term and are there any ill effects? Water splashing / pooling during rain?

-Rob

 

I made a diagram based on the LR3 information in the Firing Order And Cylinder Numbers For Land Rover Engines video referenced by cmb6s in case some people don't have the time or bandwidth to use the video.

 

So... It's fixed now. Ended up being #3 coil. I was using a diagram I found online that was not accurate. Very frustrating since that's where I started my troubleshooting!

But, thanks to this community of helpful folks, I was able to back track to the correct path before spending more time and money racing down a rabbit hole to oblivion.

A HUGE thanks to the community as a whole!

 

That's awesome, huge testament to the differential diagnosis approach to the forums.. and the fact that I think we all realized at the same time that the cylinder IDs are funky on these things haha.

 

I know I'm replying to a three year old thread, but I just wanted to say thank you for saving me a lot of time figuring this one out.

I was sitting at a stoplight and James (my lr3) suddenly started acting like something you might find in a woman's nightstand drawer that takes batteries. When I left the light he went into limp mode and threw p0300, p0303, and p0307. I had a feeling it was a coil, and couldn't believe it would be two at the exact same time. So Google brought me to this thread. To confirm my suspicions, I swapped 3 to 1, and then got p0300 and p0301. So I replaced that coil and all is well. Interestingly, last night as I was driving I kept smelling burning popcorn. I shrugged it off thinking it was one of my passengers. Now I'm pretty sure it was my #3 coil pack letting out its smoke.

Anyway, thanks again guys!

 

Funny... I googled LR3 4.4 misfire AND added the cylinders of 3 & 7 for giggle and would ya know this came up. Just tonight I had misfires on these cylinders. Coil packs are all but new at only 20k miles, Delphi brand. Last weekend I pulled them all to install new spare plugs which I know are gapped to exactly 1mm because I am stickler for that. So I know my plugs are good. That leaves the coils or fuel issue. Can not rule out fuel, but seeing that may suggest one coil can impact another I bet this is my issue. This is interesting because long, long ago I converted my 1996 Lincoln Mark VIII from coil packs to coil-on-plug when I did an engine swap. I had to use the original wiring and ECU which I knew was not an issue. It worked, converting it all over. And that was because Ford used a wasted spark setup. That meant two coils were in series and fired are the same time with one firing on the exhaust end of combustion to clear out any remaining fuel. So it is interesting that the 4.4 can have a similar issue with pairs. I guess I will see how it drives tomorrow and swap if needed, super easy to do after all and I have the old ones hand. Of course this would happen just a couple days before my big trip to the boundary waters of northern Minnesota....

Edit: Even though this happened on the one short trip to home, I went and replaced 3 & 7 (passenger side, 2nd from front and last in back at firewall) just to see what happens. Have the original coils on hand.