Stuttering/hesitation problem also MAP sensor question

[1996XJ]

Ill try and make this short as possible. I have two Jeep gladiators one 2022 Sport S and one 2021 mojave. The Mojave has once, years ago did this chugging stalling thing where I thought the truck was going to die in the intersection. Almost like you were running out of gas. Never did it again. Flash forward years later my sport S did it, no codes. Then for months nothing. A few weeks back it started doing it at freeway speeds it just sounded weird and like it was struggling pulled over and at idle acted like it wanted to die and chugged off from a dead stop. An engine light flashed but did not stay on long. Nows its been happening more now like once a day but no codes.

A while back I did a cold air intake and found oil in the stock OEM tube body leading from air filter box to throttle body. Came on here was told could be a whole range of things maybe do a catch can. Have not done one yet. About 10 or 20 thousand miles has passed there is no oil in the new AFE intake tube body but I noticed oil past the throttle body valve flap and also on my MAP sensor. Perhaps jeep overfilled when doing an oil change long ago? Maybe its normal amount? I tried to take pictures. If i had a more serious problem would i not be seeing oil in the new intake parts? Also since removing the MAP sensor and intake air temperature sensor to inspect i have no auto start stop today flashing on dash. I am going to attempt to clean them. Autozone code reader picked up nothing. Will try a get codes read elsewhere looking for stored. If jeep overfilled oil perhaps it fouled a spark plug and I am getting to the end of its life? Milage is 58,000 all original parts. Let me know if you think tune up is called for or should wait to see if there is codes. Thanks guys EDIT I believe it had done this once before the cold air intake and for sure it had evidence of oil getting into the intake. Both my gladiators use about a quart of oil in between changes. Used the recommended 0W20 for warranty but am switching to something with better viscosity next change.

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[Maximus Gladius]

Came on here was told could be a whole range of things maybe do a catch can. Have not done one yet.

This is a very good mod to add in and definitely spray off those sensors with a sensor cleaner. Also, I’d be replacing the PCV valve if you haven’t done that yet.
The oil in the intake tube can be as a result of engine oil overfill but it would need to be a significant overfill for the oil to dump in from the Fresh Air IN hose that enters the intake tube just upstream from the air filter. That tube is not connected to the PCV and that tube is also not valved.
I had a lot of oil dump into my intake at the Fresh Air IN hose as a result of a tech filling my engine with 12L, as we know, it holds 5L. So I had an extreme mess on my hands.
The PCV hose enters after the throttle body and if you’re seeing a bunch of oil in there, a catch can will collect that, keeping it out from being burned and fouling up plugs, oxygen sensors and cats.
But if it’s time to do a tune-up, change plugs and maybe oxygen sensors, definitely install a catch can.

 

[1996XJ]

This is a very good mod to add in and definitely spray off those sensors with a sensor cleaner. Also, I’d be replacing the PCV valve if you haven’t done that yet.
The oil in the intake tube can be as a result of engine oil overfill but it would need to be a significant overfill for the oil to dump in from the Fresh Air IN hose that enters the intake tube just upstream from the air filter. That tube is not connected to the PCV and that tube is also not valved.
I had a lot of oil dump into my intake at the Fresh Air IN hose as a result of a tech filling my engine with 12L, as we know, it holds 5L. So I had an extreme mess on my hands.
The PCV hose enters after the throttle body and if you’re seeing a bunch of oil in there, a catch can will collect that, keeping it out from being burned and fouling up plugs, oxygen sensors and cats.
But if it’s time to do a tune-up, change plugs and maybe oxygen sensors, definitely install a catch can.

Tune up milage in your honest opinion?

 

[swtrailboss]

I would certainly think tune not due anywhere near 58K miles. If you have misfire issues which what it sounds like (flashing CEL and then no stored codes) i would think you’re dealing with a fuel quality issue or valve (lifter) issue or both by the sounds of the frequency. Coil issues injector issues there is a lot of possibilities.
Tune shouldn’t be needed before 75-100K miles.

 

[Maximus Gladius]

Tune up milage in your honest opinion?

my honest opinion… considering what I’ve done before on my 21 JTR and will soon be doing on my 23, I looked up the life expectancy of the oxygen sensors and spark plugs and what I found was 100k miles + on the plugs and 30k miles (min) to “the life of the vehicle” on the oxygen sensors.

Looking back to my 21, I was at the 60k mark, was getting a cylinder 5 misfire, pulled that plug and it didn’t look good and the gap was way off. Also put the Ohm meter on it and the numbers on it was right around 5. The one next to it was over 6 and when I pulled them all out the numbers on the good plugs were between 6-8 Ohms and the gaps on 3 were correct, so why not change the oxygen sensors too and threw in a new MAP sensor to boot and wouldn’t you know it, it ran real nice. The misfire was the #5 spark plug. Also threw in an oil catch can as well. (All the plugs had an oil smell to them)

I’m not one that likes to wait for things to fail and I’ve never gone with what the book recommends and my “stay on top of it” maintenance has served me well. I’m sitting at about 28k miles now on my 23 JTR so I see spark plugs being changed out next summer.

Many great minds and actual techs on here will say my maintenance habits are over kill and they’d be right but if things aren’t running right, change stuff out.

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