My brother's 04 kj 3.7L started missing a little bit on cold starts a couple of months ago but would smooth out after a couple blocks of driving. It would throw a CEL and the scanner would just say misfire in #3 cylinder. last week he was driving and the engine made a terrible clanging sound and lots of smoke. He was able to limp home but just barely. He checked the compression and # 3 has zero compression. has anyone on the forum ever thrown a valve in their 3.7L?

_________________
Manure green 2005 CRD sport4x4, GDE Hot tune, Cat Gut, OE skids, Draw tight hitch, Duramax lift pump, 160K on multiple varieties of fuel, XM radio, Escort live with Redline, fog light mod, GPS, Icom IC7000 all band radio call sign KC9QPF, Grabber AT2s on Soft 8s, FIA grill blanket.

I've heard of a few 3.7s and 4.7s doing it. How many miles are on it?

I had a broken valve spring on my 3.7 somewhere between 100,000 and 110,000 miles. Had all the valves and springs replaced then. Wasn't cheap but now I have 160,000 and running strong.

63K, can you believe that. Do these engines break the valve if this happens or just bend them?

_________________
Manure green 2005 CRD sport4x4, GDE Hot tune, Cat Gut, OE skids, Draw tight hitch, Duramax lift pump, 160K on multiple varieties of fuel, XM radio, Escort live with Redline, fog light mod, GPS, Icom IC7000 all band radio call sign KC9QPF, Grabber AT2s on Soft 8s, FIA grill blanket.

From what Ive heard the valve doesnt hit the piston but Im not saying it didnt happen on his engine.

04 kj will have a 7yr/70 powertrain warranty unless it was bought used and not transfered over. 60k is pretty sad.

_________________
LOST KJ'S
Where are you going???
Current Jeep: 2004 Jeep Liberty
-Atlantic Blue
-Air Ride Rear Suspension ; OME/Rustys Lift ; Powertrax Locker ; Moog Lower Ball-Joints ; 245/70/16 Yokohama Geolander A/T-S's on MOABS ; Flowmaster 50 SUV
Lost #007082
http://www.cardomain.com/id/jeepjeepster

Yep he bought it used.

_________________
Manure green 2005 CRD sport4x4, GDE Hot tune, Cat Gut, OE skids, Draw tight hitch, Duramax lift pump, 160K on multiple varieties of fuel, XM radio, Escort live with Redline, fog light mod, GPS, Icom IC7000 all band radio call sign KC9QPF, Grabber AT2s on Soft 8s, FIA grill blanket.

nurse...i'd agree about the broken valve spring.

If he's able to check his own compression, he should be able to change his own valve springs...parts are cheap, labor isn't!

Wow, changing valve springs, what loads of fun .

_________________
Peace Through Power.

2002 Liberty, salsa red
1997 Wrangler, dark green

PSN ID: David_Lucas (Burnout: Paradise, Battlefield: Bad Company/Bad Company2)

106k on my 02' still runs real strong. I hope my springs don't break any time soon. Not looking forward to that!

_________________
02' Sport- SOLD

07' Dodge Ram Quad Cab 1500 4x4
Yeah it's got a hemi!