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Unread 04-08-2008, 06:50 PM   #1
BlackJeepin
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Need some help (shuddering)

While at a stop light, or a drivethrough or wherever, my jeep likes to surge and shudder. The rpms go from 500 to 250 then to 700, its a weird problem. When i go to take off after said problem it boggs down and acts like it wants to die, then it stutters more, then it goes. I get a CEL after putting gas in it.
Does anyone know what might be going on here, i have a 99 wrangler with an automatic transmission

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Unread 04-08-2008, 09:41 PM   #2
badoosh27
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run some seafoam through it and it should clean all that crap out and smooth it out. search seafoam on here, theres tons of threads of how to use it. sorry, im too lazy to explain it right now...
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Unread 04-08-2008, 10:15 PM   #3
Xlr8n
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Unread 04-09-2008, 02:00 PM   #4
badoosh27
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i see what you did there...
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Unread 04-09-2008, 02:10 PM   #5
jeeptinker78
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Check your trouble codes. Mine was doing the same thing. Ended up being bad O2 sensors.
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Unread 04-09-2008, 02:27 PM   #6
TheBoogieman
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Unread 04-09-2008, 02:41 PM   #7
BlackJeepin
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Thanks for the responses...o2 sensor is highly likely, mine have never been replaced, 83,000 miles.
I am also gonna run the seafoam through it to
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Unread 04-09-2008, 02:41 PM   #8
Silver04TJ
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Mine was doing about the same thing. CEL throwing P121,122,123 codes. When I would pull out and give it gas it would bog down then all of a sudden take off. Changed the TPS and it runs fine now.
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Unread 04-09-2008, 02:49 PM   #9
Jerry Bransford
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A bad 02 sensor isn't likely to cause anything worse than the engine to run too rich which makes it run more sluggishly with poorer fuel economy. RPMs that are eratic or surging are more commonly caused by a dirty IAC (idle air controller) which can be cleaned, or a dirty TPS (throttle position sensor) which cannot be cleaned, only replaced.
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Unread 06-03-2008, 06:04 PM   #10
MrRandyRhoads
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Sorry to bump this older thread, but I have a possible solution to the CEL after filling up. When I first got my Jeep, I would get a CEL after every fill up so I called the dealership thinking something was wrong. One of the techs asked me how many times the gas cap clicked when I screwed it back on. They told me that if you screw it on too tightly or leave it too loose, the pressure (or lack thereof) will cause the CEL.

To remedy this problem, screw the cap on until it clicks 3 times...no more, no less. I thought it was utter crap until I tried it, and sure enough, I haven't had a CEL since.
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Unread 06-03-2008, 06:10 PM   #11
Jerry Bransford
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You can't get the gas cap on too tight, it ratchets once it gets to the correct tightness. The OBD system check depends on that gas gap being absolutely air tight so getting on "too tight" (impossible to do) won't cause a CEL. 3 clicks, 10 clicks... all the same. Mine probably clicks 8-10 times when I spin it down quickly after filling up.
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Unread 06-03-2008, 06:39 PM   #12
Grewe02
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Originally Posted by badoosh27 View Post
run some seafoam through it and it should clean all that crap out and smooth it out. search seafoam on here, theres tons of threads of how to use it. sorry, im too lazy to explain it right now...
I don't think Sea Foam will help. Not saying it won't, but I think it's a bad sensor. I would pull all of the sensors in the intake area out and wipe them down with some isopropyl alcohol. If that doesn't fix it, I would replace the IAC and MAF sensors.
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Originally Posted by Jerry Bransford View Post
You can't get the gas cap on too tight, it ratchets once it gets to the correct tightness. The OBD system check depends on that gas gap being absolutely air tight so getting on "too tight" (impossible to do) won't cause a CEL. 3 clicks, 10 clicks... all the same. Mine probably clicks 8-10 times when I spin it down quickly after filling up.
Agreed. Urban legends.
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