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Old 06-13-2009, 05:23 PM   #1
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Idle Problem

I have a 02 Wrangler and I just replaced the Throttle Position Sensor. It runs smoothly now and when I depress the clutch to slow down the R's are right where they should be, but once I come to a complete stop the R's fall to zero and the engine stalls out if I do not rev it up. I did not have this problem before replacing the TPS. Where should I look next? Any help would be greatly appreciated. Thanks, Chad
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Old 06-13-2009, 06:19 PM   #2
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Clean the IAC (idle air controller). The IAC provides all of the engine's air when your foot is not on the accelerator pedal so if it sticks from being dirty, the engine won't idle correctly. Start the engine and spray some Throttle Body cleaner into the TB, taking care to spray a moderate amount into the idle air passage inlet slot just above the butterfly valve. That slot is where the engine gets its air when the butterfly valve is closed at idle. Spraying into that slot while keeping the engine RPMs up with the throttle linkage to keep the engine from stalling should clean the IAC pretty effectively. If it needs to be cleaned more thoroughly to completely restore a good idle, the IAC will have to be removed. Just be gentle with the IAC's solenoid actuated plunger if you remove the IAC for a more thorough cleaning, don't push/pull/spin it while cleaning it.
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Old 06-13-2009, 06:46 PM   #3
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Thanks. I will give it a try tomorrow.
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Old 06-13-2009, 10:37 PM   #4
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also check your vss
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Old 06-14-2009, 11:51 AM   #5
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Was changing the TPS difficult? That's the next step in finding the solution to my Jeep's problems.
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Old 06-14-2009, 12:25 PM   #6
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Quote:
Originally Posted by 603TJ View Post
Was changing the TPS difficult? That's the next step in finding the solution to my Jeep's problems.
It's very easy, it's only held on with two small torx-head screws. When installing the new one, just make sure the little shaft that protrudes out of the throtte body properly engages the slot inside the TPS which is a no-brainer. That will involve rotating the new TPS slightly out of position to engage the shaft/slot, then just rotate it back into position so the screw holes line up. It's easier done than described.
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Old 06-14-2009, 02:23 PM   #7
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Cleaning the IAC seemed to do the trick. Thanks for the help.
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Old 06-14-2009, 02:25 PM   #8
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You must have replaced the TPS for a reason. As it went bad over time the PCM "learned" how to deal with it until it couldn't compensate. It finally gave you trouble and you replaced it.

But - the PCM is still trying to compensate for the old defective one - it's in the memory.

You have to "retrain" the PCM about the new TPS.

Reset the PCM memory back to default, then it'll learn the new one. Disconnect the battery for 1/2 hour or so, that should do it. If it still acts up, disconnect the battery overnight.

Sometimes after cleaning the throttle body you have to do the same thing.
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Old 06-14-2009, 09:00 PM   #9
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That makes sense, since the stalling problem happened immediately after replacing the TPS. Thanks for the advice.
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Old 06-15-2009, 02:36 PM   #10
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Quote:
Originally Posted by Jerry Bransford View Post
It's very easy, it's only held on with two small torx-head screws. When installing the new one, just make sure the little shaft that protrudes out of the throtte body properly engages the slot inside the TPS which is a no-brainer. That will involve rotating the new TPS slightly out of position to engage the shaft/slot, then just rotate it back into position so the screw holes line up. It's easier done than described.
Where is the TPS located? I have the new part, but I can't see where it's at.
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Old 06-15-2009, 02:49 PM   #11
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Quote:
Originally Posted by 603TJ View Post
Where is the TPS located? I have the new part, but I can't see where it's at.
Look at the diagram already posted in post #2 above.
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Old 06-15-2009, 07:56 PM   #12
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Job done. Problem: totally fixed. thanks!

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