So, I’m jumping in here as I’ve been trying to diagnose something similar in my 2010 LR4.
So, this started about 3 years ago. I thought I’d get it when I did the chains. FYI, when I did the chains, I replaced the injectors, plugs, coils, can variators, water pump, front and rear cross overs.
Shortly afterward, I got a Bank 2 Sensor 1 cam position issue, and I swapped the position sensor and both intake cam solenoids. Problem solved…or so I thought.
For me, it’s always left bank misfires, and misfires within the first 1000 revolutions.
I swapped coils from one side to the other, put new plugs in it, swapped injectors from one side to the other….still nothing.
I swapped out the LPFP, nothing (but I needed to do that for the recall anyway) then I swapped the HPFP’s out and thought I had it…nope.
Then, I swapped the O2 sensors and the random misfires MOSTLY went away. Then I figured out I had a bad MAF…swapped them out and got rid of the rich mixture codes. Then I swapped the crank pos sensor…no change, then the cam position sensors, all 4, no change. Then I swapped the MAP sensor, and that has helped startup a little, and the rpm’s are now responding to things like the AC being on or turning the steering wheel.
However, it still struggles to start a little when cold, and I officially got the dreaded misfires on 2,4,6,8 and misfires on first 1000 revs again today.
Here’s what I did notice, at least in mine. I didn’t pop the codes until I let it sit for a while at idle on start, then drove away. (It was hot and my son started the car up to cool it down before we got there). As soon as the engine is halfway warm, there’s no struggling to start issues. Although it does high idle a little rough.
I’m pretty much at the point when I’m almost out of ideas. I looked at the temp sensors and they’re all reading the same when the engine is really cold, so I don’t think it’s anything there.
The only things left to check are the exhaust can solenoids and the cats.
I’ve smoke checked this thing, checked voltage after start up (typically 14.2) and done everything else I can think of.
I’m about to compression check and borescope it tomorrow. We’ll see what I find.
All the above is to say, it sounds like we all have similar problems…hopefully one of us will figure it out!!