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Old 07-03-2013, 02:43 PM   #1
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In need of some serious help!!!!

A couple weeks ago my jeep started to die when I would be going down a hill in gear and at about 2000 or so rpms if I took it out of gear it would just die all the sudden. I took it to the shop and they said it was a dirty throttle body first. That didn't work. Then they said it was the map sensor so they changed that and it still didn't work. Then they said it was my catalytic converter and that it has gone bad. I got a back pressure test and they said my cat was fine. The shop has no idea what is going on. There is a check engine light on with a code that reads for a absolute manifold pressure. Does anyone know what the problem is???

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Old 07-03-2013, 04:00 PM   #2
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A couple weeks ago my jeep started to die when I would be going down a hill in gear and at about 2000 or so rpms if I took it out of gear it would just die all the sudden. I took it to the shop and they said it was a dirty throttle body first. That didn't work. Then they said it was the map sensor so they changed that and it still didn't work. Then they said it was my catalytic converter and that it has gone bad. I got a back pressure test and they said my cat was fine. The shop has no idea what is going on. There is a check engine light on with a code that reads for a absolute manifold pressure. Does anyone know what the problem is???
You might want to post what engine you have. TJ's have a 2.5 and a 4.0L engine.

Some folks on there find replacing the TPS (throttle position sensor) solves this kind of problem. I would also do basic checks own things like vacuum lines and your spark plugs.

Have you had any other maintenance performed recently?

Next steps after this might be testing fuel pressure to make sure your fuel filter is not clogged or the fuel pump might be failing. Just too many things to suggest, so lets try a few and see what happens.

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Old 07-03-2013, 04:38 PM   #3
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You might want to post what engine you have. TJ's have a 2.5 and a 4.0L engine.

Some folks on there find replacing the TPS (throttle position sensor) solves this kind of problem. I would also do basic checks own things like vacuum lines and your spark plugs.

Have you had any other maintenance performed recently?

Next steps after this might be testing fuel pressure to make sure your fuel filter is not clogged or the fuel pump might be failing. Just too many things to suggest, so lets try a few and see what happens.
I have a 4.0. My first action was changing the spark plugs and that didn't help. I've checked for vacuum leak and there was one but I got that fixed up so it isn't that. Oil and oil filter / fuel filter were also recently changed.
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Old 07-03-2013, 04:46 PM   #4
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The only thing ican possibly think of isthe cps...other than that im clueless
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Old 07-03-2013, 04:48 PM   #5
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The only thing ican possibly think of isthe cps...other than that im clueless
Thank you. I meant to type CPS ( crank position sensor) instead of TPS. Getting my engines mixed up :-)
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Old 07-03-2013, 05:16 PM   #6
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Thank you. I meant to type CPS ( crank position sensor) instead of TPS. Getting my engines mixed up :-)
What does that have to do with the code for the absolute manifold pressure though?
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Old 07-03-2013, 05:20 PM   #7
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It dont- but it does with have a lot to do with shutting off...
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Old 07-03-2013, 05:20 PM   #8
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Dude im havin the same fricken problem right now. Im so clueless.
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Old 07-03-2013, 05:22 PM   #9
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Hell change ur map sensor...maybe u got a bad one- or disconnect ur battery and let the cpu reset
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Old 07-03-2013, 05:45 PM   #10
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Hell change ur map sensor...maybe u got a bad one- or disconnect ur battery and let the cpu reset
Battery was reset and the map sensor was tested and it showed it was working. This is pissing me off!!
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Old 07-03-2013, 09:10 PM   #11
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Is it only when your foot is off the gas?
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Old 07-04-2013, 04:07 AM   #12
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Is it only when your foot is off the gas?
Yes
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Old 07-04-2013, 09:21 AM   #13
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Yes
Idle air control valve.
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Old 07-04-2013, 02:22 PM   #14
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Idle air control valve.
Worth a shot at cleaning it. Might be the problem! :-)

http://m.youtube.com/#/watch?v=VwO3k...%3DVwO3k0Up_bw
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Old 07-04-2013, 02:24 PM   #15
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What does that have to do with the code for the absolute manifold pressure though?
Just a common problem that seems to be a need for maintenance. You're right, I missed your code issue, and just posted to try to help. Figured if air flow was already tested, the code is misleading.

Since then, you have tested the sensor and its working.
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Old 07-05-2013, 03:30 AM   #16
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Just a common problem that seems to be a need for maintenance. You're right, I missed your code issue, and just posted to try to help. Figured if air flow was already tested, the code is misleading.

Since then, you have tested the sensor and its working.
Yea the sensor was tested and it showed that it was working while I was driving the car. The throttle body was all cleaned too and my air filter and all that.
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Old 07-05-2013, 03:27 PM   #17
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Here's the manual on how to test your map sensor. Follow the instructions.

There are a few components that contribute to your symptoms. I would check and re-verify what the shop did. You say they cleaned the throttle body. I would still remove the Idler Air Control Valve and check/clean it again.







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Old 07-31-2013, 02:10 PM   #18
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Dude im havin the same fricken problem right now. Im so clueless.
Hey did you ever figure out/fix your problem
With it dying?
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Old 08-03-2013, 05:55 PM   #19
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I bet it was the same problem as mine. That cat is notorious. Shake it around, and see if it is stable inside. Mine was jiggling madly. After 14 years of road use, those cat's can just give up inside. If you have exhaust backing up into your engine, this would cause it to shut off. I had problems galore because of that cat. My car would shut off, rev high uncontrollably while driving, couldn't get above 40mph, it was a nightmare. Correct me if I'm wrong, but the manifold is connected to the exhaust system. I mean it is called the exhaust manifold? Changed my cat, all problems were solved.

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