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Old 07-17-2010, 07:12 AM   #1
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What could be the cause?

I searched but couldn't find an answer. I have an 03' Rubicon and after driving around for a few minutes, if I turn it off to go in the store or something and get back in and start it up, it idles as if it is flooded really bad, this only seems to happen in the warmer months if I've had the A/C on. Any suggestions on what to check or replace first?

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Old 07-17-2010, 08:04 AM   #2
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Curious about this myself as sometimes mine will behave similarly. Especially if I only shut it off for a short time, it idles rough for a minute or two, then smooths out....

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Old 07-17-2010, 08:12 AM   #3
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Curious about this myself as sometimes mine will behave similarly. Especially if I only shut it off for a short time, it idles rough for a minute or two, then smooths out....
Exactly what mine does, but it seems to worst this summer, than last summer! If I wasn't selling my house and could park in the garage at night, then I wouldn't have a problem because I usually only have the bikini top on and no doors!
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Old 07-17-2010, 08:58 AM   #4
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I have heard legend of vapor lock type condition where the fuel is boiling in the fuel rail, but it's never happened to me and I live in the second circle of hell.
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Old 07-19-2010, 08:36 AM   #5
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I'm really needing some suggestions on what to check first.
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Old 07-19-2010, 08:42 AM   #6
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Well blkrubi, we'll just have to keep bumping this until someone sees it I guess....
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Old 07-19-2010, 09:29 AM   #7
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Not sure how long you have had the engine running when it does this but it could be because it is running rich as if the choke is on for the cold start up. It would be the computer doing this and the same thing happens on my car if I start it and then shut if off after running for a few minutes. They just need to warm up and then the computer will adjust the fuel mixture to lean it out.
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Old 07-19-2010, 09:49 AM   #8
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Mine was kinda doing the same thing and the fuel boiling in the rail was a suggestion, so I wrapped the fuel rail in aluminum tape to keep heat out and it seemed to help...Good luck!
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Old 07-19-2010, 10:31 AM   #9
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(Thinking to herself...... Hmmmmm, wonder what a fuel rail looks like?)
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Old 07-19-2010, 10:55 AM   #10
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Exactly what symptom are you having that you are describing as it appearing to be "flooded"? Just the rough idle?
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Old 07-19-2010, 10:57 AM   #11
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Fuel rail is where the injectors all connect too.

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Old 07-19-2010, 11:13 AM   #12
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Exactly what symptom are you having that you are describing as it appearing to be "flooded"? Just the rough idle?
That's the best way I could describe it, when I restart it, it acts as if is flooded, kinda like an old car with a carburetor! After I get it started, I can then pat the gas a few times and then hold it to the floor for a few seconds and it will clear up!


There again this only happens if I have to have the top and doors on and run the A/C.
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Old 07-19-2010, 11:31 AM   #13
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I'm thinking the fuel rail is not completely filled with gasoline which is causing one or more of the fuel injectors to be starving for fuel that will cause a misfire. If this problem gets worse the longer the Jeep sits, the most likely cause of that is a defective anti-drainback valve that is inside the fuel pressure regulator that is mounted onto the top of the fuel pump. You have to drop the gas tank to replace the fuel pressure regulator which you can find at RockAuto Auto Parts for $90 or so.
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Old 07-19-2010, 11:54 AM   #14
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Thanks Jerry, I'll give that a try as soon as possible, a little busy with selling a house and buying a house!

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