Strange problem with my 3.8L - : Jeep Wrangler JK Forum
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post #1 of 4 Old 01-27-2014, 03:19 PM Thread Starter
Join Date: Sep 2013
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Strange problem with my 3.8L

I drove home for lunch today and when I went to start my Jeep to leave it started right up and then died immediately. I tried 2-3 more times with it dying each time after it started and then finally it started running fine and I drove to work.

When I went to leave work it did the same thing so I tried again. The first time I tried it just died again. The second time I tried the starter continued to turn over even after I let go of the key. I immediately switched over to "off" and it stopped. I tried one last time and it started up and I drove home fine.

The dying problem didn't seem that strange until the starter stuck on. Any ideas what is going on? No lights or anything came on at all.

Its a 2007 JKU
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post #2 of 4 Old 01-27-2014, 03:49 PM
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Maybe the battery in your key fob is dying. If you try to start the Jeep without a smart key, it will start then immediately die.

I'd replace the little battery and see what it does then.

2010 2 door manual sport
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post #3 of 4 Old 01-27-2014, 04:08 PM
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Buddy of mine just had the same problem. Ended up being the battery terminals were loose. It would crank over and want to start but didn't. We cleaned the terminals and clamps and tightened them down. No problems since.
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post #4 of 4 Old 01-27-2014, 05:01 PM
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It's not the battery in the key, as the transponder doesn't require a battery.

If the JK in question has an automatic transmission, it has "TipStart", which means it will continue to crank after letting go of the key, until it starts, or 10 seconds if it fails to start.

Starting, then shutting off in a couple seconds usually means the wireless control module has not recognized the key.

Have a spare key handy next time it happens. Try the spare key after the first start failure with the regular key. That should tell you if the problem is the key or the wireless control module.

If it happens with both keys, go under the hood and pull up on the large white fuse holder in the fuse box, then reseat it after a few seconds.
This will reset the wireless control module if that is what it needs.

2008 Unlimited Rubicon Automatic
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