Ever swap injectors?(4.7)

[paroxysym]

So as I continue to get a damn misfire on cylinder 2 on my 4.7 I'm troubleshooting the hell out of it, and I'm considering it to possibly be an injector OR a lifter. The facts:

-changed all my plugs 1k ago with OEM champions and then the misfire occurred
-swapped my coil packs from cylinder 3 to 2 and the misfire stayed with cylinder 2
-swapped the plug from cylinder 4 to cylinder 2 and misfire still occurred on cylinder 2
-the previous was just as bad as the other 7 so now reason to believe it's an injector yet
-Seafoamed through the brake booster line twice mass amounts of carbon dispersed and still have a misfire
-Seafoam in the tank with premium fuel helped alittle but the misfire came back

It's real apparent and happens when she's in OD and her RPMs are under 1800 and she's lugging it. If I knock it down to 5th gear she smoothes out and runs normal. But in OD lugging it she gets alittle rough and jumpy. Thoughts on this? I'd hate to get rid of her over this as it's really pissing me off. She has a misfire over the summer on cylinder 1 but I solved that with a couple seafoam treatments.

[07JeepXK]

Swap injectors and see if the misfire moves to that cylinder

[paroxysym]

know of a write up to do so? i take it that its not as easy as swapping a coil pack..

[Matt]

Swapping injectors isn't very hard... but the whole fuel rail needs to be lifted out. There's not much in the way, just the intake and vacuum hoses. You also need to relieve fuel pressure before doing this.

The link in this post has a service manual download- you can use it for a step-by-step R&R:
http://www.jeepcommander.com/forums/...4&postcount=39

[paroxysym]

Compression test in the AM. Now in the event the injectors bad, would you replace just the one or would it make sense to replace them all?

[07JeepXK]

Well considering I'm sure they aren't cheap, and like everyone says if it's not broke don't fix it I personally would just replace the one if that's the issue. But if your pockets are deep or you have a money tree in your back yard then he'll replace them all lol

[06JeepXKHEMI]

I would have to agree with most of this but I think age of the also plays into it. My 240s run better, better mpgs and smoother idles with premium fuels, especially from racetrac. The HEMI XK was also sensitive to the fuel brand I ran in it, Sunoco was best I tried. I would have to believe this is based on what/how much additives are being used. I've never heard of using higher octane to "clean" the system but have heard of using name brand fuels rather than your eco fuels. I'm also I big fan of Techron, my family has used it in all their vehicles

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