when warmed up jeep started sputtering on take off? - JeepForum.com
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post #1 of 29 Old 01-21-2013, 11:49 AM Thread Starter
91YJOWNER
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when warmed up jeep started sputtering on take off?

So drove jeep about 40 miles to work a few weeks back and when I got off freeway coming up to light, I went to take off and it sputtered then slight rough idle. Parked it and on way home no problems. Took jeep ice fishing and about 50 miles in, same thing at take off from light. Thinking fuel pump or cat? I don't drive it daily anymore since I work from home. Any ideas of what it could be? PO put new cat on before I bought it two years ago. Haven't noticed any other issues. Could it be a small vacuum leak opening up when hose heats up?

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post #2 of 29 Old 01-21-2013, 06:37 PM Thread Starter
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When I say warmed up I mean runs fine until about 30-45 minutes and only sputters at take off after that but not all the time. Wondering if any of these symptoms could help you guys help me diagnose it.
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post #3 of 29 Old 01-22-2013, 12:25 AM
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sounds like exhaust blockage to me


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post #4 of 29 Old 01-22-2013, 10:30 AM Thread Starter
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That mean cat may be going bad from not being driven as much? If I drive it more frequently could it clear it up?
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post #5 of 29 Old 01-22-2013, 05:20 PM
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Might be a vac leak. Not sure if it is a blocked up cat though. I had a cat on my YJ break into chunks and even with the outlet around 90-95% blocked off it still idled fine and only bogged while driving when the engine reached ~2000rpm. It did however have chunks that would block and unblock the exhaust outlet making it kinda hard to figure out, with the symptoms intermittent. I ultimately discovered the source of the problem when I went to replace the muffler.

Any codes?
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post #6 of 29 Old 01-22-2013, 06:56 PM
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When was your last tune up? It is always a good place to start. 40 minutes is about 30 minutes longer then it takes to go into closed loop. Maybe an exhaust manifold leak? Have you checked fault codes?
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post #7 of 29 Old 01-22-2013, 08:56 PM Thread Starter
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Have look into reading codes, will they show up without engine light on? Tune up sounds about due.
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post #8 of 29 Old 01-22-2013, 09:14 PM Thread Starter
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I watched a video about using key to check codes so will do that tomorrow. Man I love this place.
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post #9 of 29 Old 01-25-2013, 05:43 PM Thread Starter
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Only fault code came up as 55. Anyone know off top of head what that means? Will search FAQ's if I can find it on phone.
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post #10 of 29 Old 01-25-2013, 07:42 PM
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You should see 12,33,55. All are normal for a YJ. So it never does it cold, only when it is hot? It is an important thing to note.
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post #11 of 29 Old 01-25-2013, 08:28 PM Thread Starter
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Yeah just once each drive as it has been running for a bit and I take off. May be bad gas since I only driven it twice in the last month but put some miles on each time and now hoping burned it up or was just being sensitive to her since I don't daily drive her any longer.
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post #12 of 29 Old 01-26-2013, 08:24 AM
ROTTEN
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Run some chevron techron
Follow the instructions and see what happens.

Do a complete tune up. Fight that fuel filter off. I suggest buying a length of new FI hose for that 90 piece that goes into it.

And report back

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post #13 of 29 Old 01-26-2013, 08:56 AM
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difference from warm/cold usually means either an exhaust leak or a bad O2 sensor.
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post #14 of 29 Old 01-26-2013, 09:03 AM
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Oh. I had that issue. I unplugged my o2 and sputtering went away. So I got a new o2. Took me over a month to find the issue. That was my fun last February..

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post #15 of 29 Old 01-26-2013, 09:59 AM Thread Starter
91YJOWNER
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I think tune up is due and I will check o2 sensor. Don't suspect exhaust leak, but will check it out.
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