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Old 10-20-2013, 03:17 PM   #1
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93 2.5L stumbling on highway

Hey all,

Need some help. Trying to figure out this problem. My jeep starts fine. Runs fine around town. When I get on the highway and get up to speed (65-75 mph), when I ease off the gas to just maintain speed, the engine starts stumbling and bucking (mostly in 5th gear but occasionally in 4th). I've replaced the IAC, TPS (most recent), plugs, wires, cap and rotor. I checked the codes and got 12 33 24 14. I know 33 is no A/C and 24 is the TPS fault, which I replaced. 12 is no memory because I disconnected the battery installing fog lights (driving condition occurred before I disconnected the battery). And 14 is MAP sensor fault.

Anyone have a similar problem or any ideas on something to try to fix this?

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Old 10-20-2013, 03:45 PM   #2
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Its because you have a 2.5l...they arent supposed to go that fast haha. no offense but 4.0's can cruise at 50 and 60 no problem, 2.5s are risky at those speeds. you prob shouldnt go up to 5th gear either unless your racing it. and you prob got stock dana 30 and 35s on it, you might want to upgrade to a dana 44. good luck

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Old 10-20-2013, 04:04 PM   #3
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Quote:
Originally Posted by AutobotWrangler View Post
Its because you have a 2.5l...they arent supposed to go that fast haha. no offense but 4.0's can cruise at 50 and 60 no problem, 2.5s are risky at those speeds. you prob shouldnt go up to 5th gear either unless your racing it. and you prob got stock dana 30 and 35s on it, you might want to upgrade to a dana 44. good luck
You obviously didn't read. No where did it say he couldn't maintain speed. He's having an ignition problem. Check for any codes. Hold down the trip button and turn the key to the on position. Not start. But on. Then release the trip button.

Edit: check you tps wires. Make sure there isn't a short or anything.
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Old 10-20-2013, 04:25 PM   #4
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QUOTE="jherrington;5517738"] You obviously didn't read. No where did it say he couldn't maintain speed. He's having an ignition problem. Check for any codes. Hold down the trip button and turn the key to the on position. Not start. But on. Then release the trip button. Edit: check you tps wires. Make sure there isn't a short or anything.[/QUOTE]
This isn't how you check for codes on a YJ. And he already checked the codes. So obviously someone else isn't reading right.

Replace the MAP sensor and ensure the vacuum line is connected without any leaks, and did you reset the computer after you replaced the TPS? If not you can try that too disconnect battery for more than two minutes and try again.
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Old 10-20-2013, 07:01 PM   #5
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[/QUOTE] This isn't how you check for codes on a YJ. And he already checked the codes. So obviously someone else isn't reading right. Replace the MAP sensor and ensure the vacuum line is connected without any leaks, and did you reset the computer after you replaced the TPS? If not you can try that too disconnect battery for more than two minutes and try again.[/QUOTE]

Have you had this problem before? I've looked all over the internet and haven't been able to find anything on this and all I could find on MAP sensor faults are that it causes bad fuel mileage.
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Old 10-20-2013, 07:04 PM   #6
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Originally Posted by AutobotWrangler View Post
Its because you have a 2.5l...they arent supposed to go that fast haha. no offense but 4.0's can cruise at 50 and 60 no problem, 2.5s are risky at those speeds. you prob shouldnt go up to 5th gear either unless your racing it. and you prob got stock dana 30 and 35s on it, you might want to upgrade to a dana 44. good luck
No offense but you really don't know what you're talking about. I've had my jeep for almost a year and a half and frequently drive 65-75 and have had no problems what so ever. And not going into 5th gear would just make the engine rev higher and work more and kill my gas mileage.

But seriously, thanks for the laugh reading your reply. It was funny
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Old 10-20-2013, 07:10 PM   #7
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I had a similar problem with a broken Catalytic Converter. Ceramic ones shatter when going through cold water and choke the exhaust, they are cheap and sometimes people put them on to save $$$ That's about all I can offer.
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Old 10-20-2013, 07:49 PM   #8
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Lenardisag- yes sorta, with every elec part that's throwing a code you have to reset the computer. And the MAP sensor monitors Manifold Air Pressure, and if it has a fault it either has a vacuum leak or the sensor itself is bad telling the computer that there is a leak, cause a numerous amount of issues. But I always like to start with the known problems then start looking else where. The computer tells you there is a problem I would start with fixing these first then go from there.
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Old 10-20-2013, 08:42 PM   #9
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Lenardisag- yes sorta, with every elec part that's throwing a code you have to reset the computer. And the MAP sensor monitors Manifold Air Pressure, and if it has a fault it either has a vacuum leak or the sensor itself is bad telling the computer that there is a leak, cause a numerous amount of issues. But I always like to start with the known problems then start looking else where. The computer tells you there is a problem I would start with fixing these first then go from there.
Alright I'll give that a try. Hopefully it helps

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