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Zero, burns no oil. I have pushed 6500 miles on occasion on Rotella T6 and the oil level has stayed the same. That's what throwing me off. I would think on a worn engine that it would burn SOME oil atleast.

I don't have an air pump to power to leak down tester unfortunately, but I'm still looking for a shop that can do the test for me. The previous owners did not take care of the Jeep as far as I can tell. The coolant system was sludged up and it did have an overheating issue until I replaced...

I'll try doing a piston soak and see if it changes anything. The Jeep is rust free and in great shape. I plan on keeping it forever if I can. Too much fun, too many memories with it and easy to work on.

I have been chasing a P0303 misfire code for quite some time now. I went through everything and determined it is most likely an engine issue. 2006 Jeep Wrangler with the 4.0 and 190k miles. I did do the water cleaning trick where I held the motor at 2000 rpm as I trickled a quart of water into...

So you think I probably have a top end problem?

Okay so I just ended up doing a compression test myself and here's what I got. Engine was hot, measured after 8 cranks for each one. Cyl 1 (dry): 175 psi Cyl 2 (dry): 180 psi Cyl 3 (dry): 145 psi, wet 160 psi Cyl 4 (dry): 170 psi Cyl 5 (dry): 160 psi Cyl 6 (dry): 180 psi So it looks like the...

The reason I'm skeptical is because all these compression testers seem to read something different. I'm not sure if it's something I'm doing wrong, but I got a loaner set from Autozone once and had numbers all over the place. Then went to Harbor Freight and bought a compression tester and had...

This is something a mechanic would be able to identify with a borescope right?

That's quite a lot for a bottle! Wow! I tried the water thing, don't know if it made a difference in how well it runs. That being said, I still occasionally will have a slightly rough idle but no misfire codes and nowhere near as rough as it used to be and it's been fine for the past 600 miles...

Ok so I drained the old oil out, replaced with fresh oil and dumped half a can of seafoam in the crankcase. 300 miles in and no misfiring at idle. I'm leaning more towards this is a carbon deposits issue with the valves? Could just have somehow temporarily fixed whatever problem is going on...

I think I might do this anyways, can't really hurt right.

Unfortunately it is a coil rail and just one piece, I cannot move it around. Also, it is a waste spark system so I think if that was the issue I should be getting a miss on cylinder 4 too. Swapped it anyways to rule it out. I'm going to have another shop that is familiar with these motors...

Mine does, I pulled it out and cleaned it. It seems like it is working fine. I do not think they go bad too often, and if it did I think it would cause a P0300 multiple misfire code right? Not just be specific to cylinder 3.

This is what I'm wondering. If there is an issue, I don't think it would be bottom end?

It is a coil rail, one piece goes over all six plugs. It's a little strange. I replaced the whole unit.

All plugs looked good, exactly the same, and that is what I'm going to do next. I'm also considering having another shop just look at it. I felt like the original one I took it to was too quick to condemn the engine and send me a $5k quote.

Is there no chance a gummed up valve can't be seating properly on occasion causing the intermittent rough idle and misfire? I thought a mechanical failure would be more consistent. No wires, coil on plug. I did replace it.

I have a 2006 Jeep Wrangler with the 4.0 motor and 188k miles on it. I've owned the vehicle since 110k miles and have changed my oil every 5k with Rotella T6 10w30. A couple weeks ago, after long drives, the motor would idle rough and would throw a P0303 code. I initially thought this was a heat...