Seems to be a #2 cyl (driver's side front) problem. Check engine light will come on for a misfire when damage is done.
Not much info but seems to be mainly on Wranglers which have a quite different intake manifold design. Reports indicate burned valves which could result from an overly lean mixture or detonation which is odd to appear only on a forward end cyl unless the timing or injection has an issue for that cyl.
__________________ SCOTT The HARDER you work...the LUCKIER you are!
2014 REDLINE red Jeep SRT "BLOODIED" 1 of 1
2013 JKU Wrangler 10A-stormtrooper'ed, JW Speaker and more! Previous JEEP rides-
2013 Jeep Grand Cherokee SRT-deep cherry
2006 Jeep Grand Cherokee Laredo-inferno red
Not sure what to make of this, but speaking as a victim of the Chrysler 2.7L V6 ($1500+) water pump, I'm really glad I opted for the unlimited extended warranty. You folks might want to look into it before the price jumps due to this issue.
Yes it does say on the window sticker where the engine was built. I don't it matters though this problem has been with engines out of both plants. From what the article says they did make a design change but not everyone will have the problem. It sounds like it takes certain circumstances to create the issue. It seems one is cheap gas.