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Unread 05-23-2007, 10:49 PM   #1
Chloetar
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Join Date: Jan 2007
Location: Joliet, Illinois
Posts: 128
Electrical gremlins TPS/IAC

Hi. Last week after sustained highway driving, my cel cam on and at the first stop I pulled a 0121 and fuel injector codes. To address the 0121, I replaced the TPS and IAC (I was playing with it and took it apart so I just said hell).

When I put everything back, the injector codes were gone. The road test proved that the truck would not shift. Took the TPS off, made sure it was on right and then road test. It shifted, but the CEL came back 0121. After about a mile or two at 40MPH, the trans forced a downshift, bucked and went back to normal. Ditto after another few miles.

Anyone ever have this happen? Wife says if electrical gremlins, Jeep goes for a diesel pickup. But I like my Jeep.

Got the TPS at Danger Zone here in Joliet, might it be a defective one? But then again, was there anything wrong with the old?

Any advice much appreciated. 114K miles.

Thanks,

Joe

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'00 GC Laredo 4.7 / FM Delta Flow 40 Series / K&N Drop in /Rancho 5000's and Steering Stabilizer / Uniden 68LTW CB w/4' FS II
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Unread 05-24-2007, 09:49 AM   #2
greasefingers
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1994 ZJ 
 
Join Date: Sep 2003
Location: Northern VA, USA, NJ
Posts: 8,237
I have a test procedure for the tps, if you have a multimeter.
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Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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Unread 05-24-2007, 06:37 PM   #3
Chloetar
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Join Date: Jan 2007
Location: Joliet, Illinois
Posts: 128
Hi Greasefingers, I would like to hear it. This thing has me stumped. Thank you for replying, I notice on these threads most people cannot answer the real issues. If I wanted to know what size tire I could use with a 2" lift without trimming, I would have had 50 replies by now. Nevermind that the question is asked 4 or 5 times a day.



I apologize to everyone out there for my ire, I know these are community forums and the elctrical gremlins have me down. I am taking the Jeep and a trailer on a 6 hour ride tomorrow.
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'00 GC Laredo 4.7 / FM Delta Flow 40 Series / K&N Drop in /Rancho 5000's and Steering Stabilizer / Uniden 68LTW CB w/4' FS II
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Unread 05-24-2007, 09:40 PM   #4
Chloetar
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Join Date: Jan 2007
Location: Joliet, Illinois
Posts: 128
Update to electrical gremlins IAC/TPS

Newsflash:

The problem was a loose nut behind the wheel. There are two part numbers for the TPS, yours truly got the wrong one. Result of correct one - runs like silk like it should. Wife and dog will comfortably ride this weekend.

Again - did not mean to go off on anyone in particular, was channeling anger away from throwing tools through windshield.
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