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  #37  
Old 12-07-2012, 11:07 AM
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Re: '04 WJ, bizarre misfire of sorts

No updates yet, thanks for asking though... Been swamped at work and the same after work with family stuff, so it's hard finding time to get to the jeep. The weekend looks pretty good though.

I did notice that it had that misfiring feeling/sound from the get go this morning. It usually doesn't happen til the engine heats up a bit. I'm guessing whatever it is is getting worse (maybe more easily discovered I hope!)...

Thanks,
Lorne
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  #38  
Old 12-10-2012, 02:52 PM
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Re: '04 WJ, bizarre misfire of sorts

Well, I ended up sick Saturday and Sunday and didn't get to do anything with the jeep. I have 2 Denso upstream O2 sensors on order and should have them tomorrow, so we'll go from there.

Friday afternoon we took a long ride (hour each way) with a few stops around our destination. After a while (40 minutes or so) of running it seems to behave better than in the 20 minute drive to work. After sitting a couple times for 15 minutes or so it was still ok, then a couple times in between it was back to it's old self. The trip home seemed pretty smooth... Weird! Then again, it's my truck! lol

Thanks!
Lorne
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  #39  
Old 12-14-2012, 08:14 AM
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Re: '04 WJ, bizarre misfire of sorts

I have the O2 sensors and borrowed an O2 socket. Will be changing them out tomorrow. Will keep you posted.

Thanks!
Lorne
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  #40  
Old 02-01-2013, 08:16 AM
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Re: '04 WJ, bizarre misfire of sorts

Hey guys!

Well, after a very long stint of being quite sick, I finally got the opportunity to change out my O2 sensors. No notable difference. It was warmer (in the 60's) earlier in the week and again, it ran much quieter and smoother. Now it's cold and the Jeep's loud. There's always been a slight bit of stumble to it sitting at a light. Is it possible that what I'm hearing is the broken exhaust manifold bolt issue I've been hearing about?

My thought (and please feel free to tell me if I'm smoking something here) is that maybe the manifold starts off relaxed and pressed up tight to the head. Then after a few minutes of running it heats up (unevenly) and warps and pulls away, creating an exhaust leak on one cylinder. The colder it is, the worse the warpage until everything stabilizes in temperature and sort of un-warps to a point. After running it for better than 20 minutes it quiets down some and runs a bit better. If I shut it off to run into a store or something, it will typically be better after sitting for 10 or 12 minutes.

Yesterday I noticed that the problem started just prior to it going into closed loop mode, as when I got on the freeway it was not warm enough yet to engage overdrive. It allowed OD about 3 or 4 minutes after it started running obnoxious. Is that theory at all feasible or am I going the wrong direction?

Thanks!
Lorne
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