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So my Jeep has the straight six and the engine finally started to show some age and misfire, etc. at 250k miles. Failed a leakdown test, so I'm having it rebuilt. That did make me wonder though, how many miles do people really get out a rebuilt or remanufactured motor? I know in a perfect world...

I have a 2006 Jeep Wrangler with the 4.0 and 217k miles on it, it has the original engine. It has been running great and I've been changing my oil every 5000-7500 miles with Rotella T6 10w30. I drive about 45k miles a year, which is why I like to extend OCIs out to 7500 if I can. I sent an oil...

I'm a student in college and I have a little free time this summer. I was wondering if while I had the time, it would be a good idea to replace the wheel axle u joints, wheel bearings, and ball joints on my 2006 Jeep Wrangler before they go bad and I have to spend a ton of money at a mechanic...

I heard it is, especially at my mileage, but strangely enough a machine shop I talked to were the ones who actually suggested I order a new head because they already expected the exhaust valve to be recessed, said they wouldn't be able to rebuild it most likely. I guess they seem to find it common.

Of course! I absolutely hate when I'm having the same issue as someone else and they don't post the outcome. Good luck with yours! Saw you're trying the MMO piston soak, I'd check compression before and after the soak and see how much of a difference there is.

Mine is an 06 so luckily I dodged the crack prone heads, but I had to replace mine early anyways. When I first bought it, it used to run quite hot, like 250+ coolant temp. Of course the temp gauge was buffered and would stay pretty much centered at 210. I don't think the previous owners ever...

I recently had to replace the head on my Jeep 4.0 with less than 200k miles on the clock, pretty sad but I don't know what the previous owner did maintenance wise. The Wrangler was in rough shape when I'd bought it. So anyways I was thinking, when a well maintained, not abused motor eventually...

Replacing the head solved the issue. The exhaust valve on cyl 3 had recessed enough to cause the intermittent miss. After replacing the head, it's running great. Bottom end looked great as well when we pulled the head off.

I just wanted to update: It was the exhaust valve seat on cyl 3 that was causing the misfire issue. The valve had recessed. After replacing the head, the engine has been running great.

I bought the lifetime alignment back years ago and I regret it. Firestone makes every excuse to not align the vehicle and when they do, it's not done right. I took my Jeep in to three different shops and none of them could center the steering wheel correctly. Eventually I just gave up, learned...

I have only had the Jeep for the past year and a halfish, and am at 190k now. Must have bought it June 2023. I drive quite a bit. The symptoms I'm having are the occasional rough idle, and then misfire codes. Other than that, nothing. Only throws the misfire code at idle as well, no issues when...

So I redid my compression test after all the cleaning I did with water, seafoam, GM top end cleaner, etc. Cylinder 3 is upto 158 psi from 145 originally. The rest of the cylinders stayed about the same. I also re did the wet compression test and this time did it on all cylinders. Added a...

Honestly it's more so that it bothers me. I don't want to feel like I'm driving a POS. It's been a good vehicle over the 80k miles I've put on it so if a head replacement is all it takes for it to run fine then that's okay.

Yup he said he doesn't think it's a good idea, would apparently add another 8 hours of labor? I guess the oil pan adds three hours... I'm confused as to how, it's a few bolts looks like a 30 minute job but what do I know.

Yeah unfortunately, that is exactly what happened. None of them can give me a definite answer. I don't understand why it's so difficult for them to do a dry and wet compression test, leak down test, and if it's borderline stick a camera in there and take a look around. I'm not a mechanic though...

Literally everything anyone can ever think of I'm pretty sure I've ruled out.

See I have literally ruled everything else out and done seafoam. B12 I have not tried though. I swapped the plugs and swapped the coil as well too, as well as the injectors, as well as the o2 sensors, as well as the cam sensor, and did a bunch of other things as well like check all the injector...

That's what they think but it's concerning me that literally none of them seem to be completely confident that it is the issue. I did try with another compression tester though and got the same numbers.

The misfire came back even after the GM top end cleaner, and going through these responses I am hearing a few different things. One being my piston rings could be the issue. I know I cannot totally rule them out, but if my piston rings were truly the issue, how am I getting high compression...

Nope, this is my next step if compression does not improve after the piston soak and top end cleaner.