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Old 02-08-2017, 11:30 AM
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Several hesitations before starting

I did a google search and an advanced search in the forum and came up empty with my question

My 2012 JKUR had several no starts the other day. I turned the key off and tried to restart and nothing until the third or fourth time. Here are some details:

- 3/4 tank of gas
- never had any hard starts before this
- no hard starts since
- seemed like a very strong likelihood of lack of fuel
- 95,000 miles
- vehicle was hot and I let it run sometimes and turned off sometimes while clearing brush from the trail
- there were three times that this happened while on the trail
- was off-road on a very slight offcamber grade (higher left to right, shelf road)
- altitude approximately 8,000 feet and no high altitude issues before and plenty of variety of altitude expeditions from sea level to 11,000 foot passes over the years
- never have run out of gas since owned new at 14 miles

Any input would help

I'm under extended warranty, but have no codes that have shown up. Will be bringing into the dealership for another issue (rear locker worked last week but failed to engage same outing as hard start, unrelated probably) next week and will have them check into the starting issue too.
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Old 02-08-2017, 01:32 PM   #2
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Is your engine completely stock? No tuner/tuning, stock air intake, etc.,.?

If you suspect fuel delivery, get a hold of a fuel pressure gauge to keep with you so that you can evaluate fuel pressure at the time of the no-start condition.

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Old 02-08-2017, 01:36 PM
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Mopar CAI. Otherwise stock, been on for 70,000 miles

Will have them check fuel pressure

Thanks
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Old 02-08-2017, 01:41 PM   #4
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Sounds like your Cam/Crank shaft position sensor is going out. That is what I would search on. That sensor tells the engine that everything is in the correct position to start, if it is faulty it will not allow the engine to fire.

There was a post a while back where people were complaining about a intermittent failure to start.

Part number is 05149141AF
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Old 02-08-2017, 03:22 PM   #5
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I've seen a post on another forum about issues with the "big white fuse" in the TIPM as well as loose connections in the wiring harness. I would assume an electrical gremlin, but it does sound a lot like a vapor-lock situation. Fuel injection shouldn't have a vapor-lock problem, though.

On Trail Ridge Road in Rocky Mountain National Park, my grandparents mid-80's Chevy Caprice Classic got vapor-locked. The one and only time I've ever witnessed it, first-hand. It's spooky to have a perfectly operating vehicle not start when you are miles from town and help.
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Old 02-08-2017, 03:33 PM   #6
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You can look at this other forum post I had seen, here.

Key not working. - JKowners.com : Jeep Wrangler JK Forum
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Old 02-12-2017, 12:47 PM
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Thanks for the replies
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Old 02-14-2017, 04:22 PM   #8
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check your battery first!!! having a weak battery does a whole bunch of strange things...
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Old 02-17-2017, 12:09 PM
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Quote:
Originally Posted by nighowl2000 View Post
check your battery first!!! having a weak battery does a whole bunch of strange things...
Good call

However, I forgot to mention that I have a brand new yellowtop that is working flawlessly since I got it a month ago
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Old 02-17-2017, 12:24 PM   #10
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Quote:
Originally Posted by COStrider View Post
Good call

However, I forgot to mention that I have a brand new yellowtop that is working flawlessly since I got it a month ago
check the battery clamps are tight and check your grounds.

Could be a bad camshaft position sensor like was mentioned. my 2014 had a defective one which gave my random hard starts. Dealer gave me grief about it so I replaced it on my own. 75$ for the sensor and a 30 torx bit, 10 mins later and my jeep starts perfectly every time.

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