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Problem with starting and maintaining idle

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Old Sep 30, 2012 | 08:06 AM
  #1  
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Here is the problem I had, while driving at highway speed in the rain my JK cut out and died the ETC light along with the engine light came on. I pulled over and tried to restart and it did after pumping the gas and it wouldn't idle. I eventually got it to go but very erratic idle until I got it home. I checked the codes and this is what came up P0301 cylinder 1misfire, P1790 transmission control module checksum, P2172 high airflow vacuum leak. My jeep is a 2009 unlimited. What would anyone recommend I do to fix these issues?
Update, it will not idle I have apply full throttle to keep it going.

Thanks,

Last edited by Biggs74; Sep 30, 2012 at 08:46 AM.
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Old Sep 30, 2012 | 10:18 AM
  #2  
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Originally Posted by Biggs74
Here is the problem I had, while driving at highway speed in the rain my JK cut out and died the ETC light along with the engine light came on. I pulled over and tried to restart and it did after pumping the gas and it wouldn't idle. I eventually got it to go but very erratic idle until I got it home. I checked the codes and this is what came up P0301 cylinder 1misfire, P1790 transmission control module checksum, P2172 high airflow vacuum leak. My jeep is a 2009 unlimited. What would anyone recommend I do to fix these issues?
Update, it will not idle I have apply full throttle to keep it going.

Thanks,
i recommend a Hemi...that is all
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Old Sep 30, 2012 | 10:31 AM
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Surely someone has some insight.
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Old Sep 30, 2012 | 10:37 AM
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Sorry I'm on my phone but search "puddle + stall = super weak sauce"
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Old Sep 30, 2012 | 10:38 AM
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it sounds like a large vacuum leak , look under the hood at all your hoses and ck look close at your brake booster hose that could potentially be a large leak but seems you would have noticed braking issues a large leak will cause lean conditions which may be responsible for the misfire . the tranny reads vacuum to detect load and driving conditions , i think you got a hose or maybe a manifold leak. after checking a little online it appears your problem could be as simple as the map sensor

Last edited by carolinajk; Sep 30, 2012 at 11:21 AM.
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Old Sep 30, 2012 | 11:29 AM
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Thanks I will keep checking
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Old Sep 30, 2012 | 02:33 PM
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I have checked parts store for MAP sensor and not available, can you buy one at dealer and DIY?
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Old Sep 30, 2012 | 02:49 PM
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ebay is full of them less than 20 bucks
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Old Sep 30, 2012 | 03:28 PM
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We're is the MAP sensor located on the '09 unlimited?
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Old Sep 30, 2012 | 03:37 PM
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its right on the rear of the intake its a square looking sensor ,did you look for lines loose broken etc?
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