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Unread 08-18-2006, 12:54 PM   #1
KC8RXQ
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Aggrivating "skip" at highway speeds

I'm looking for advice on a situation that's been more of an aggravation than a real problem - so far.

My 2004 JGC Ltd. (@ 46k miles, 4.7L stock all the way) has developed what I call a "skip" or "burp" for lack of a better description. It appears during highway driving, especially during extended driving at the same speed. I know it's not the road conditions because I actually feel this sensation regardless of whether I'm driving on concrete or asphalt - smooth or moderately rough. [I may be too sensitive to things like this but I get the feeling that most of the Jeep owners that subscribe to this forum are "in tune" with their vehicles.] The frequency of this "skip" is once or twice every few minutes and like I said before, it's more of a nuisance than a problem; at least at this point. My Jeep is well maintained - not abused, routine service has always been performed and the vehicle hasn't been off road. While the standard warranty has run out, I still have the DCX 7yr/70,000 mile drivetrain warranty. I'm more curious as to whether anyone else has experienced the same situation and how it was addressed.

Thanks to all the moderators for a well maintained forum, and to those who take the time to respond to my inquiry.

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Unread 08-18-2006, 01:01 PM   #2
Varkyl
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It sounds like there is a slight misfire. Have you tried pulling the codes? Or even running a different brand or grade of fuel.
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Unread 08-18-2006, 01:05 PM   #3
Diehard
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Try using some STP fuel injector cleaner when you fill up next time. Have you changed the plugs at 30,000?
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Unread 08-18-2006, 01:06 PM   #4
sand zj
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Turn the key on-off-on-off-on and check for codes (on oddometer or other display) DO NOT START IT each time, just to ign. The codes will be a P___, write down the codes then let us know what they are.
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Unread 08-18-2006, 01:35 PM   #5
KC8RXQ
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Aggrivating "skip"...

I've already tried a can of Seafoam in the gas tank and went to a few tanks of 89 Grade gas. I'm not hesitant about putting another can in the tank but I wasn't sure just how often I could do it without doing any damage (my ignorance shows). I checked for the engine codes, through the ignition switch procedure, and the word "done" came up on the display. I take that to mean that there weren't any codes to process.

The only thing I haven't tried is replacing the spark plugs which hasn't been done before. I'll take care of that issue and see how things turn out.

Thanks to all for the replies and enjoy your jeeps.
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2004 JGC Limited 4.7L Quadra Track II (stock)
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Unread 08-18-2006, 02:45 PM   #6
rm2001wj
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I'll bet it doesn't do that when the AC is turned off. At least mine doesn't. Seems to be the compressor going on and off. I've been told that there is not much that can be done about it.
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Unread 08-18-2006, 03:10 PM   #7
EMTimZJ
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Hmmm... I was going to say TPS sensor... but that generally throws a code...
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Unread 08-18-2006, 08:06 PM   #8
zjhitman
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46K on the original spark plugs. That's the first thing I would change. It may be as simple as that.
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Unread 08-18-2006, 08:06 PM   #9
trickle26
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I was thinking TPS as well...I had the same kind of surge/skip at highway speeds that you are talking about and it was a bad TPS sensor. It did not throw a code. I was checking the codes after the problem occurred and didn't get anything. Replaced the TPS and problem gone... I am not sure about the TPS on the 4.7. It does seem like a bad TPS can cause a lot strange idle/surging problems.

The A/C cycling on/off like rm said could also be the source.
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