[bradbrown66]

I have replaced , plugs and the coil pack rail. Even tried the sea foam stuff. The only codes are the misfire one for each cylinder. It will idle rough and can still drive it but feels like the whole jeep just shakes. I can drive it up to 2900 rpm but once it hits 3000 it will lay down till it gets back to 2500 rpm. Any one have any ideals?

[Mishimoto]

Did this happen after you replaced all the parts or was it a problem for a while? Have you pulled the plugs recently to read them?

[bradbrown66]

This has been an intermittent problem for about 2 months but always went away when I floored the gas on start up. Last Friday it started this misfire and hasn't stopped. I have to drive it to work like this lol. I keep it out of overdrive because the shaking is so bad. I disconnected all my sensors around the intake area and reattached them in case of a bad connection. I also took the idle air valve off and cleaned the plunger on it. Not sure what to do next. I just don't have the money to through away on stuff I have to geuss on lol

[Mishimoto]

When it was intermittent, did it happen on cold startups only or when the engine was hot?

[bradbrown66]

Startup when it was cold and when I shut it off to go in the store and the startup.
Today I pulled the battery to erase all codes then drove the **** out if it to make it fault again.
Now after that I only show #5 misfire so I'm gonna recheck my plug gap. ???

[bradbrown66]

I checked my plug on #5 cylinder and it looked like it had oil on it. I put one of my used spark plugs back in it, one that was working and looked like it had been hot. To my dismay , it still misfires only on #5 cylinder. If I'm running to heavy of oil like 20-50 w would this cause the litter to stick?

[Mishimoto]

It's oil on the plug and not gas? Do you mind if I ask why you're running 20-50W?

[bradbrown66]

I just had to add oil more often when I use lower weight oil. I know not a good reason. I'm gonna put 10-30 in it this weekend.

[bradbrown66]

May have been gas , but it wasn't a clear color

[bradbrown66]

Today at lunch I checked what codes came up.
P300
P304
P305
P155
It sounded a lot worst today lol. This is the first time a oxygen sensor came up.
Maybe now the real problem is showing up ?? I'm not a mechanic as you can tell. I'll be documenting this till I get it fixed so maybe this will help others.

[Mishimoto]

So you're missing on cylinders 4 and 5 and that 02 sensor is more than likely the result of your misfire. Something (gas, oil or coolant) is dumping into the exhaust and the 02 sensor gets covered in that substance, giving you a code. Can you do a compression test on each cylinder?

How long have you been burning or leaking oil? Can you see any oil leaks? When is the last time you checked your coolant in the radiator and the overflow? I would check those for oil just to be on the safe side.

[bradbrown66]

What a weekend. I had o2 sensors alarms, miss fire on 2 and 5. I started over. I put the old coil pack back on it after I found the problem. The push tube on cylinder 5 rear and cylinder 2 front push tube had came out?? I put them back in and changed my oil back to 5w30 and it has ran great ever since. I don't know why them push tube came out?? I do know there is a bunch of sludge build up on top side so I'm gonna start running that Lucas oil additive to help clean it out. Can you think of anything else I ought to do? Thanks for your help

[Mishimoto]

Drive it and enjoy it! Probably would just make sure the oil gets changed on time