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Old 08-06-2006, 12:07 PM   #1
Join Date: Jul 2006
Location: Idaho
Posts: 6
2000 TJ engine probs continued

Hi again,

Ok, so I have continued to resolve my error code 123 (check engine light on) to no positive results. My jeep continues to "hesitate" during exceleration, like it's starving for fuel or something. A short hesitation, then the power returns. It is especially bad going up hills, and when the engine is cold. I have changed the plugs (the old ones looked pretty good), oil change, fuel line/injector additive, new air filter. Nothing has worked. I thought maybe the fuel filter had some buildup, but found out that it is attached to the fuel pump!!?? I'm not very impressed with that from Jeep. I did look into the throttle body and under the "butterfly flap", there was some black buildup on the walls of the throttle body. Any advice?? It comes off, and is thick, like something you'd wipe off the side of the engine.

One possibility on my 123 error, I read somewhere that the airbag clockspring going bad can cause this check engine light error to occur. Any good advice on fixing?? I still don't think that will fix the running problems......this is getting real frustrating.


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Old 08-07-2006, 02:18 AM   #2
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what about the fuel rail/fuel filter?

I am the anti chrome.
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Old 08-07-2006, 12:23 PM   #3
Join Date: Jul 2006
Location: Idaho
Posts: 6
I'll check into the fuel rail, fuel filter is attached to the pump I guess, don't want to replace the whole unit if I don't have to.
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Old 09-20-2006, 09:31 PM   #4
Join Date: Sep 2006
Posts: 1
Hey I have the same problem on my 98 tj, did you find the problem? I didnt get an error code but it does the same hesitation..also is yours a manual or auto?
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Old 09-21-2006, 11:17 AM   #5
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Join Date: Jul 2006
Location: Ohio
Posts: 63
that code is for Throttle position sensor. Let me know if this helps.


With the ignition ON, and battery voltage above 10.4 volts .

TPS voltage at PCM goes above 4.9 volts for 3.2 seconds .


TPS ground circuit open
TPS signal circuit shorted to 5 volt supply circuit
TPS defective (voltage < 1.0 volt )
TPS signal circuit open
TPS signal circuit shorted to voltage
TPS wiring harness intermittent defect
TPS wiring harness observable defect
Throttle Position Sensor (voltage change)
Powertrain Control Module

2001 Jeep Wrangler Sport (Flame red. Bikini top, Hard top, Step bars, 31x10.5 on Cragar Soft 8's, pretty much stock...for now)
2001 Dodge R/T (Loaded)
2001 Dodge R/T - Indy edition (Indy red, Intaked, Braked, Leathered, Powder coated, polished & Exhausted)
1977 Pontiac Astre (chevy powered and overdrived)

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Old 03-04-2010, 06:40 AM   #6
Join Date: Mar 2010
Posts: 1
I have this some problem !!! I replace TPS,CPS and all spark plugs !!! (they was black) don't know why !!! I did disconnect the clockspring etc... I clean all the connection plugs,tight all earths ... and reset the memory few times and my jeep its still struggling to excelerate proply... code p0123 always comming back !!! and sometimes code P0073,P0627,P0685. can somebody help me with that ??? is it possible so is the fuel filter ??? how do I change the fuel filter ??? I think i gonna sale this jeep sooooon ...

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