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Old 03-05-2009, 07:50 PM   #1
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Symptoms of bad Throttle Position Sensor?

I have a 92 4.0 FI YJ and I have a hesitation problem. My throttle seems to have a dead spot in it when accelerating and deccelerating past a specific position of the pedal regardless of rpm. The problem is that it does the same thing even if I temporarily disconnect the TPS. How does the ECU know how much fuel to send if the TPS is not connected. I also temporarily disconnected the MAP and still the same problem. I replaced the Crank Position Sensor, new plugs, new wires, new cap, new rotor button. What could it be?

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Old 03-05-2009, 08:27 PM   #2
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Does the rig miss/backfire at the certain pedal position?

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Old 03-07-2009, 11:48 PM   #3
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the TPS from my experience usually gives a fast idle, and sluggish acceleration, as well as horrible gas mileage. if any of these fit it could be your tps. But to me it almost sounds like a lean condition maybe bad gasket etc. I assume it is a stick? another thing to possibly think about is the fuel pump regulator. I am not sure if it is in the fuel pump itself on the yj like the XJ has but if that goes or the checkvalve goes it can cause the dead spot you are having.
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Old 03-09-2009, 05:29 PM   #4
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Thanks for the input, it is a 5spd but it doesn't backfire. It seems as if it loss either spark or fuel comletely for an instance and then springs back to life after launching my head forward then into the seat. I can hold the pedal in that spot and it will sputter and jerk until I can't take it anymore. The position in question just happens to be the speed you would want to ride while in 5th gear but it also does it in all gears.
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Old 03-09-2009, 09:34 PM   #5
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I would say most probably you have a vacumn leak causing a lean condition. that is usually the cause of a flat spot. ANother thing you might want to do is to used some fuel injector cleaner. where might you be located?

sean
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Old 03-11-2009, 05:39 PM   #6
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Smile

Thanks again for the input. I replaced the TPS yesterday and it runs like a top now. So now I have a newly tuned, new filters, new crank position sensor, new tps, no vacuum leaks and clean fuel system which all needed to be done anyway and still only spent a little over $100 by doing all the work myself. Thanks for your help!
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Old 03-11-2009, 06:08 PM   #7
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Great to hear! yep that bogging sucks for sure. Could have cost you a few bucks at the shop since they want to throw everything on the computer. Nothign better then doing it yourself.

Sean
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Old 08-30-2009, 10:42 PM   #8
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I have an Automatic 2004 Wrangler that has/had the same problem described above. The family was loaded into the Jeep on our way to hit the trails. While at a stop light the engine seemed to rev and slow down. I thought I pushed the accelerator by accident. As soon as I got on the highway it started to sputter and act like it was going to die.

I called around and was told to replace the Throttle Position Sensor. I replaced it the same day and took it on a test drive without any problems. The family was loaded into the Jeep and we headed for the trails again. The problem duplicated itsef again, only not as violent.

I parked the Jeep and took a nap. Later that afternoon I drove around for awhile without any problems. It seems to be running fine now. Does the computer have to reset itself after replacing the TPS? Is it common for a new TPS to "act up" until it gets "broken in"?
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Old 08-31-2009, 12:17 PM   #9
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^^^ yes
Computer needs to get used too
some changes

Always a good Idea to give it a good test drive
after Work
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Old 09-13-2011, 01:51 PM   #10
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Quote:
Originally Posted by 92wranglerofmine View Post
I have a 92 4.0 FI YJ and I have a hesitation problem. My throttle seems to have a dead spot in it when accelerating and deccelerating past a specific position of the pedal regardless of rpm. The problem is that it does the same thing even if I temporarily disconnect the TPS. How does the ECU know how much fuel to send if the TPS is not connected. I also temporarily disconnected the MAP and still the same problem. I replaced the Crank Position Sensor, new plugs, new wires, new cap, new rotor button. What could it be?
Sorry to bring this thread back from the dead, but I think I'm having a problem with the TPS as well. I just ordered one today and it will be here tomorrow. Are these hard to replace? Anything specific I need to know before trying to put it on tomorrow? 1995 2.5l FI manual 68000 miles

Before I put it on, should I try disconnecting battery cables to reset computer? Does the TPS go out of adjustment or is it unusable once it starts acting up?
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Old 09-13-2011, 03:07 PM   #11
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Its two torx bolts and an electrical plug. Usual instructions call for the neg cable to be disconnected for safety. Easy to install, after install run it for a few miles at op temp and at least 40 mph.
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Old 09-14-2011, 08:55 AM   #12
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Good deal. Thanks
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Old 12-29-2011, 08:04 AM   #13
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Hi.I bought my wrangler 5 years ago. And I change my throttle position sensor on new. Now I haven't any problem. It is very good work.
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Old 12-29-2011, 12:22 PM   #14
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on a 90 yj 4cyl. where is the tps located?
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Old 11-10-2013, 01:25 PM   #15
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Lightbulb TPS Location on 2.5L YJ

On my "89 YJ w/ 2.5L the TPS is attached to the side of the throttle body with 2 Torx Screws and and electrical connector. Auto Zone has one (part #MU105) that is a direct OEM replacement and has a lifetime warranty. Will cost you about 50 bucks and and half an hour of your time.

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