So I acquired a "free" 2002 KJ sport about a week ago. P0302 is the code, misfire cylinder 2. Best I can tell is the intake seat dropped causing the misfire and probably effing the head for further use. I don't have the head off yet, just the valve spring and it makes a metallic, odd clanky sound when spun. The cheapest route would be to replace the head with a reman, but the rest of the motor has 135k on it. I can get a reman. motor for a couple thousand bucks, but those are of questionable quality. Soooo, I was wondering is it is at all possible to swap in a 3.7 from a later model KJ/KK?

I've seen low mile examples for under $2k and thought that would be a good way to go.

Any ideas?

Thanks
-Chris

Same thing happened to mine a while back, however it did not damage the head. It cost about $400 to fix, but I've been good to go for 60,000 miles since then. The mechanic said it was a stroke of luck that no more damage was done, so hopefully you have the same luck.

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"BERT" 2003 3.7L Sport Gasser with the 5-speed stick
Frankenlifted (plus 1 extra rear iso. and a 3 nut clevis), Al's gen 4.5 UCA's, Full Mopar Skids, Kurt Hitch, Soft 8's, BFG AT's 245 75 16, Rock Lizard Front Bumper, fence top-rail crossbars (unbent!), some stuff inside...

It's gonna matter how much the engine has been tried to run. With ours, it wasn't much and the head was able to be repaired. If it has been tried a bit, you could also be looking at piston/rod replacement and sleeving that cylinder.

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Aaron

A vehicle isn't yours till you learn to wrench on it yourself.

2002 Jeep Liberty Sport (Eugene, I am the Passenger, And I ride and I ride.)
1999 Chev Astro 2WD (Green, Daily Driver)
1997 Chev Astro AWD (Grumpy "The Heep", $250 Rally Van, 335k miles, 2" lift, 31" tires)

my lib is currently having both heads replaced as well as the valve system due to misfires starting in cylider 3 and then getting worse from there. $3k is the cost..

My '02 is on it's third engine..... Factory one broke a valve spring and dropped a valve spring at 83K. Replacement engine didn't have 5K on it before it dropped a valve seat casuing engine number three to be installed. luckily I bought an aftermarket warranty from the stealership when I picked up the jeep so it hasn't hit me as hard as some of the rest of the folks who have had the misfortune to have this happen.

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'02 Sport 4x4, 3.7L, 245/70R16 Bigfoot A/T tires, Tow Hooks, Rear Hitch