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Unread 10-01-2007, 11:16 PM   #1
XJER
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1999 XJ Cherokee 
 
Join Date: Feb 2007
Location: Littleton, CO
Posts: 15
Rough Idle on '99 Cherokee--TPS

My xj is idling wildly at various times for no reason. It will go from almost dying to 2,000+ RPM's. My buddy told me the throttle position sensor. I already cleaned all air intake ducts, changed air cleaner, new plugs and wires. Any other ideas?
Thanks for any response.

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Unread 10-01-2007, 11:27 PM   #2
BlkBird
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2004 TJ Wrangler 
 
Join Date: Apr 2003
Location: Moscow Mills, Missouri
Posts: 954
Does it continue to do it as you drive it or only at idle? Personally, Im thinking the IAC.
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Unread 10-02-2007, 12:09 AM   #3
XJER
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It does it while driving and idling. I notice it more at idle, but it does it in both instances.
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Unread 10-02-2007, 07:49 AM   #4
BlkBird
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Well, he might be right then. My TJ kinda bucked going down the road when its TPS went south, but I got a CEL immediately though.
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Unread 10-02-2007, 07:59 AM   #5
XJAce
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My TPS went south long before it threw the code at me. I had to pull the fuse for the transmission so I could manually shift the AW4 and get to the parts store. This lead to the check engine light coming on while I was driving, the engine started to misfire. Put the new sensor on......perfect!!!
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Unread 10-02-2007, 09:21 AM   #6
XJER
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Little bit of a novice here, so what is the IAC and CEL? Thanks
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Unread 10-02-2007, 09:08 PM   #7
BlkBird
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2004 TJ Wrangler 
 
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Location: Moscow Mills, Missouri
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Idle Air Controller, and Check Engine Light
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2004 Wrangler X 4.0
2000 Cherokee Sport 4.0
1992 Dakota Sport 5.9
1971 Pontiac Firebird
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Unread 10-02-2007, 09:19 PM   #8
98redXJ
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Join Date: Apr 2007
Location: Kentucky
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i had the problem and replaced my distro cap, rotor button, and coil... works much better now.
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