Running like garbage... hot garbage

[13 Legion]

I already spoke and got some input from Eaglescout. Just seeing what others thought. 2.5 had been running rough lately. Felt like it was losing power and just struggling. I replaced fuel filter.. it needed to be changed and I thought this could be the culprit. Drove for about 20 min. Seemed to be driving fine but still struggling which felt almost like a miss.It has had recent plugs, wires, cap and rotor. My Jeep finally just died out. I waited about 20 min and it started back up. Looked under the hood. There seemed to be oil that had sprayed out. I took the cover off my TBI and it appeared there was oil in here. I checked my oil level it was about 1 quart low. I have a breather cap on my valve cover( I disconnected the hose to air box eons ago with no adverse effects.) and there was smoke coming from under the cover. I attributed this too just being low. Is it possible that somehow the tube that runs from cover to under TBI pulling( sucking) oil into the throttle body? Eaglescout recommended a compression test, which I’m going to do. Sorry long winded but is there a way to put a PCV check valve into this system? Could that be my problem?  It always(when I had airbox tube hook up to valve cover) had oil residue in the box. Thanks for any added input. 87 2.5 RWD. About 140,000 on the engine.

[jdog]

have you done cruisers valve cover mod, not sure if it applies for the 2.5 or not? @cruiser54

[13 Legion]

I replaced valve cover years ago. Just started having this problem. So was it normal for the 2.5 to have oil blow by in the air box?

[Pete M]

I second doing a compression test.  super easy and could answer a lot  

[13 Legion]

Took spark plugs out today. The ends were all covered in oil. Cleaned off( their only a few months old) wire brushed and put back in. Took off TB cover. There was oil residue in there. If you look close in pic you can see it. Still planning on compression test hopefully this weekend. I’m still gonna take a look at the CCV system. Like I said I think it’s malfunctioning somewhere and oil is getting sucked into throttle body... hence rough running and oil fouled plugs. I’ll keep this updated.

[13 Legion]

Just finished a compression test. Readings as follows from rear to front of engine. 120,120,110,130 on my 2.5. I checked tube from valve cover to TB. It appears to be clear and unclogged, I felt suction on it. I am sending a short video of engine running. It sounds like it wants to die out and shudders occasionally while trying to maintain idle. Thanks for any input guys/gals! 

 

[13 Legion]

Thanks Eaglescout for your help. I’m gonna pop off valve cover and inspect but most likely change all valve seals. I will update this post later to see if this rectified my problem. 

[eaglescout526]

No problem at all! Let us know what you see.

[13 Legion]

Thanks to EagleScout yesterday for your help. Swapped in new plugs, breather and air filter. Checked and adjusted TPS. Condition still exists. Sounds like a miss when running.( New cap, rotor and wires as well recently)  Engine seems to shudder. I’m leaning toward more of an engine issue then sensor. Presently plan to pull off valve cover and check valve springs for any damage, to maybe explain a valve getting hung up or inoperative.  I may end up changing out valve seals because oil is still getting into combustion area. I haven’t ruled out rings yet. Like I said earlier for it to be solely the rings, every cylinder would have to have failed since all 4 plugs were oil fouled. At 140 on the engine I can’t imagine this to be the case. Will post more when I uncover more!  2.5 Jeepers Creepers😎