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Old 03-05-2011, 06:52 PM   #1
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Jeep idols funny and cuts out

I have a 97 jeep wrangler sport 5 speed 3 inch lift 33 inch tires. Every other time or every two or three times i drive it it will idol high then low and back and forth then when i start going in each gear and start taking off and get about half way into each gear when i give it about half gas it will cut out and not pull until i floor it then it kicks back in and starts pulling or driving again. Thanks!

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Old 03-05-2011, 07:11 PM   #2
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Probably a bad throttle position sensor. If cycling the accelerator pedal up and down without the engine running 50-75 times changes the symptoms when you start the engine, odds are very good the TPS is bad and needs replacing. You can do the same thing more easily by cycling the throttle linkage on the throttle body. Cycling the throttle works the TPS wiper (it's a variable resistor) inside back and forth which may clean it up temporarily enough inside to make it work better... which also indicates it needs changing.

If doing that changes nothing, it doesn't necessarily indicate the TPS is good either. The TPS is just a common cause of such issues. If it goes bad, it can't be cleaned, only replaced.
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Old 03-05-2011, 07:13 PM   #3
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TeHe... Idols...

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Old 03-06-2011, 07:10 PM   #4
Mmm.. How deep is that?

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My 01 Sport was doing the same thing and after buy'n sensors it was doing the same thing, then i narrowed it down to the aftermarket power control module, once i took it off it was fine.
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Old 03-08-2011, 06:36 PM   #5
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Quote:
Originally Posted by Jerry Bransford View Post
Probably a bad throttle position sensor. If cycling the accelerator pedal up and down without the engine running 50-75 times changes the symptoms when you start the engine, odds are very good the TPS is bad and needs replacing. You can do the same thing more easily by cycling the throttle linkage on the throttle body. Cycling the throttle works the TPS wiper (it's a variable resistor) inside back and forth which may clean it up temporarily enough inside to make it work better... which also indicates it needs changing.

If doing that changes nothing, it doesn't necessarily indicate the TPS is good either. The TPS is just a common cause of such issues. If it goes bad, it can't be cleaned, only replaced.
Can the TPS need replacing even if it isn't throwing a code?
And how easy is it to replace. I mean, does it just connect up or is there specialist fitting required?
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Old 03-08-2011, 08:10 PM   #6
Mmm.. How deep is that?

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unplug the wire and 2 star screws hold it in, takes about 2 min.
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Old 03-08-2011, 10:49 PM   #7
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My son's jeep has been doing the same thing. I have changed the TPS with no change. Have done the battery thing to reset computer no luck. The next thing I guess will be the IAC module and check for a vacumn leak.
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Old 03-09-2011, 12:42 AM   #8
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When you get to the IAC, simply clean it and the oriface its plunger fits into with throttle body cleaner. They get dirty which is the usual problem with them, they rarely actually fail and need replacement.

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