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Old 07-19-2013, 12:18 PM   #1
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idles at 1500 rpm's

and now when i shift to second gear it sputters. dont know if all this rain here in south florida is getting into my gas tank or maybe its a bad spark plug. anyone know anything about this? now my check engine light is on.

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Old 07-19-2013, 12:21 PM   #2
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Get the code read and let us know what it is.

If I had to take a shot in the dark I would say TPS (throttle position sensor)

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Old 07-19-2013, 12:39 PM   #3
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excuse my ignorance. what code do i need get read?
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Old 07-19-2013, 12:45 PM   #4
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Quote:
Originally Posted by squanto305 View Post
excuse my ignorance. what code do i need get read?
The one that is causing your check engine light to come on. You can have it read for free at a parts store.
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Old 07-19-2013, 01:00 PM   #5
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thanks
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Old 07-19-2013, 02:09 PM   #6
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Quote:
Originally Posted by Big Sarge View Post
Get the code read and let us know what it is.

If I had to take a shot in the dark I would say TPS (throttle position sensor)
I second this. TPS is the problem.
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Old 07-19-2013, 02:44 PM   #7
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How about the IAC (Idle Air Control)
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Old 07-19-2013, 03:05 PM   #8
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You dont even need to take it to a parts store to check the code. Here are the steps...


Turn key to On position. On is the position right before ignition. Then turn the key from On back to Off 5 times with the key ending on On.

On-off-On
On-off-On
On-off-On
On-off-On
On-off-On

If you did this within 5 seconds you should get the code reading on your odometer. It might take a couple trys to get it right but it works on the spot. Good luck!
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Old 07-19-2013, 04:57 PM   #9
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Quote:
Originally Posted by tkfx View Post
You dont even need to take it to a parts store to check the code. Here are the steps...

Turn key to On position. On is the position right before ignition. Then turn the key from On back to Off 5 times with the key ending on On.

On-off-On
On-off-On
On-off-On
On-off-On
On-off-On

If you did this within 5 seconds you should get the code reading on your odometer. It might take a couple trys to get it right but it works on the spot. Good luck!
What years does that work for again?? His is a 99 per his profile
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Old 07-19-2013, 09:27 PM   #10
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The 'key trick' to get the codes is on-off-on-off-on (within 5 secs) but won't work on '98, '99 and 2000 models.
You can check the Throttle Position Sensor (TPS) by simply unplugging it.
If the TPS is bad, revs will drop to normal once it's unplugged.
Here's a a pic of the throttle body on my '97 showing the sensors - TPS, IAC (Idle Air Control) and MAP Sensor (Manifold Absolute Pressure).
If you remove your air-intake tube, have a look at your throttle body - if it's not as shiny as this on the inside, it could also benefit from a clean.
Click image for larger version

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When my TPS went bad, I drove around for 2 months with it disconnected before I replaced it.
Only side effects were Jeep used more gas and it would struggle if I gave it too much throttle (but that may be due to the 3 speed auto).

But high revving can also indicate a vacuum leak

EDIT: If the TPS needs replacing, I'd highly recommend using a genuine Mopar part only.
I've been through 3 TPS's in the last 12 months - the 2 cheaper aftermarket TPS worked initially and bought the revs back down but didn't last long.

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