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Old 03-24-2013, 01:34 PM   #1
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NO power up hill, cant figure it out

I have an 05 TJ 4.0 with 33x12.5's, recently i have been having trouble accelerating up any type of incline. I am aware that she aint supposed to be flying up hills going 60, but recently ive had a really tough time. I recently had the code p0421 pop up and so i figured it was an o2 sensor and started by replacing the front upstream sensor, the guy at autozone had reset the engine light prior to replacing the o2 sensor and it has not turned back on....yet. i dont hear any rattling from cat? banged on it a little and nothing. Im not an expert by any means and im not too sure where to go from here.

forgot to mention i have 3.73 gears and am hoping to upgrade soon. i know thatll help a bit.

any help is greatly appreciated.

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Old 03-24-2013, 01:45 PM   #2
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Quote:
Originally Posted by Trill View Post
I have an 05 TJ 4.0 with 33x12.5's, recently i have been having trouble accelerating up any type of incline. I am aware that she aint supposed to be flying up hills going 60, but recently ive had a really tough time. I recently had the code p0421 pop up and so i figured it was an o2 sensor and started by replacing the front upstream sensor, the guy at autozone had reset the engine light prior to replacing the o2 sensor and it has not turned back on....yet. i dont hear any rattling from cat? banged on it a little and nothing. Im not an expert by any means and im not too sure where to go from here.

forgot to mention i have 3.73 gears and am hoping to upgrade soon. i know thatll help a bit.

any help is greatly appreciated.
Are we talking Mountains or just rolling hills? did the replacement of the O2 sensor happened before the loss of power or after? You have never had issues before going up these hills before and the jeep has had the same tires on it?

I have a 2004 Rubicon with 33" X 10.5 I climb mountain passes in CO at 60 - 65 without much effort. granted I have to downshift into 4th and 3k RPM to maintain that speed.

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Old 03-24-2013, 01:55 PM   #3
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I had the same issue with my 93 Pathfinder...went through everything. Then finally changed the fuel filter again (only 3 months old) when I took it off and drained it the inside had broke loose and was flopping around. I figure that when I started up hill it must have rolled around restricting fuel flow and thus the power. Sure enough new one...problem solved.
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Old 03-24-2013, 01:56 PM   #4
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just rolling hills, its sad really. i noticed the loss of power more after the 02 sensor was replaced, but all of this has happened in the past 1 1/2 weeks or so. i did just buy 4 new tires probably almost a month ago, but same size.
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Old 03-24-2013, 02:06 PM   #5
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FWIW I have had the Cat replaced 3 times on my TJ (running 95 octane does not help your TJ) and each time that is how I would notice it was starting to have issues..lower power....and it never rattled...and usually all at once NO POWER!!!! And that usually happened when I was trying to accelerate.....first time (first CAT) it got to the point the Jeep wouldn't even do 50 mph. that is frustrating!!!

GL!!
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Old 03-24-2013, 08:58 PM   #6
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FWIW I have had the Cat replaced 3 times on my TJ (running 95 octane does not help your TJ) and each time that is how I would notice it was starting to have issues..lower power....and it never rattled...and usually all at once NO POWER!!!! And that usually happened when I was trying to accelerate.....first time (first CAT) it got to the point the Jeep wouldn't even do 50 mph. that is frustrating!!!

GL!!
Could be a Cat issue but if it only happens when going up a hill that is not normal for a clogged CAT. When you are just driving around town no hills and floor it does it feel like you have all the normal power?
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Old 03-24-2013, 09:03 PM   #7
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Could be a Cat issue but if it only happens when going up a hill that is not normal for a clogged CAT. When you are just driving around town no hills and floor it does it feel like you have all the normal power?
I agree totally.....In my situation it had slowly lost power, and I didn't realize how much until it was "restricted" enough to impair "normal driving" no "hard acceleration".

By all means if you feel it is "normal" performance for your set up the rest of the time it probably isn't the Cat.

Muffler shop I went to, said the only way to know for sure was to cut the pipe in front of the CAT since it wasn't throwing codes....big difference than!!
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Old 03-25-2013, 05:27 AM   #8
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I say take a sawzall and remove the cat, and see what happens. (If its OEM) you can put it back if problems still exist.

Incidentally my yj had done something similar, and I hadn't heard anything banging or shifting. When we cut off the cat you could hear it jiggling around. Luckily it was oem and part of it had rusted away and I could see the baffle shifting and choking the exhaust pipe.

HTH
Mike.
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Old 03-26-2013, 01:55 PM   #9
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It was the cat, luckily I got it to the dealer in time for it to be covered under the 8/80 warranty. Thank god. Local shop quoted $700 for parts and labor, really didn't wanna fork that out. I only had like 1/2 a month left before my jeep is 8 yrs. wshhew. Also turns out I have the wrong spark Plugs? Not getting those changed at the dealer tho.
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Old 03-26-2013, 02:56 PM   #10
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what spark plugs do you have ???
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Old 03-26-2013, 04:08 PM   #11
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glad you got it fixed
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Old 03-26-2013, 06:47 PM   #12
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Could be a Cat issue but if it only happens when going up a hill that is not normal for a clogged CAT. When you are just driving around town no hills and floor it does it feel like you have all the normal power?
It very well could be that the cat is partially restricted to the point it isnt noticeable until a good incline is negotiated. Mine was that way. Completely driveable yet loss of power was obvious on hills.



ETA: oops didnt read the thread the whole way through. Trill, glad you got 'er fixed.
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Old 03-27-2013, 11:54 AM   #13
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what spark plugs do you have ???
He didn't tell me what kind they were, and I don't get it back until Friday. I'm planning on buying some champions and getting them changed at a shop near me
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Old 03-27-2013, 08:59 PM   #14
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He didn't tell me what kind they were, and I don't get it back until Friday. I'm planning on buying some champions and getting them changed at a shop near me

If you take your time it really isn't that tough to do....you can get to them fairly easily..unless you are really lifted.
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Old 03-27-2013, 09:08 PM   #15
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He didn't tell me what kind they were, and I don't get it back until Friday. I'm planning on buying some champions and getting them changed at a shop near me
Dont put the Champions in your 05! The NGK ZFR5N is the correct plug.
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Old 03-27-2013, 11:48 PM   #16
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dont put the champions in your 05! The ngk zfr5n is the correct plug.
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Old 03-28-2013, 05:00 PM   #17
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Meh

Changing plugs are easy. Just make sure their gapped properly.
Grats on the new cat! Lolz
D

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