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Old 09-29-2012, 08:53 PM   #1
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2012 Wrangler JK won't start-thoughts?

I recently purchased my beautiful 2012 Saraha about a month ago.

Yesterday I ran my kid to school with no problems. About an hour later I started the Jeep but had difficulty as it had a very low unstable RPM idol of about 500 RPM which lasted a few seconds--then the engine died. I attempted to start it again...this time the starter would only crank, but no engine fire. After several attempts, I gave up and called Jeep.

Their recommendation was to start it in neutral and see how it went. I did and the same story happened (on a cold engine), but this time I think there was a faint smell of gas. The engine briefly cranked over and then quit.

By the time the tow truck arrived to tow the Jeep to the dealer the engine was fairly cold again. The tow truck driver attempted to start the engine. This time the engine turned over and continued running fine, however, we both smelled gas. Off to the dealer the Jeep went.

Today I received a call from Jeep. They cannot identify what is wrong at all. The engine starts fine, they smell no gas, diagnostics are fine....I asked them to keep the car and see if anything pops up, perhaps on cold start. Fortunately they agreed.

Could this be vapor lock? I have taken the Jeep off road twice, however, I haven't done any of the crazy stuff like my 19 year old son does! Any thoughts from anyone? The obvious thought was the fuel pump, but they are denying there is a problem.

I failed to say I only have 2800 miles on it!

Please help!!

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Old 09-29-2012, 08:56 PM   #2
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Can you get vapor lock with fuel injection?


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Old 09-29-2012, 08:58 PM   #3
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IDK. This was my husband's suggestion. I think it's when you get vapor/air in the gas line right? I failed to say I recently filled my gas tank and did have the oil changed at 2800 miles the day before.
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Old 09-29-2012, 09:32 PM   #4

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Bad gas?
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Old 09-29-2012, 10:58 PM   #5
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it sounds like it flooded itself. a sensor might be going bad or perhaps it had a hiccup. it might just be a one off thing. i would take it back and drive it until it happens again
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Old 09-30-2012, 03:36 AM   #6
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I have posted this countless times. Find a gas station near you that sells gas with NO ethanol in it.
All window sticker on all new cars and truck the mpg is rated on 100% gasoline 0 ethanol. Most stations have 10% ethanol in there gas. Ethanol draws water.
I have a boat and snowmobile that will not run on gas with ethanol in it at all.
Here is a link to find a gas station in your state that sells gas with NO ethanol in it.
Ethanol-free gas stations in the U.S. and Canada Find your state at the bottom of page.
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Old 09-30-2012, 09:47 AM   #7
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And no ethanol free gas stations remotely close to me.

Ethanol forms a weak bond with gasoline. In the event water gets into the fuel tank, the ethanol easily breaks the bond with gasoline to bond with water. Not normally a problem with automobiles that get used on a daily basis. But if there is enough water in the tank or the vehicle sets for several days, the ethanol/water separates form the gas and settles to the bottom of the tank. This is called "phase separation". Then the ethanol/water mix gets pulled thru the fuel system to the engine.
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Old 09-30-2012, 10:54 AM   #8
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Interesting....my son mentioned that and I did just fill up. Thanks for the advice!
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Old 09-30-2012, 11:00 AM   #9
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Just realized I live in So Cal....my next trip where there's no ethanol will be next Easter break jet skiing in Lake Havasu! Clean air laws, ya know here

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