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Topic Review (Newest First)
07-19-2013 09:27 PM
Wesboy 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.
Attachment 274987

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.
07-19-2013 04:57 PM
Big Sarge
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
07-19-2013 03:05 PM
tkfx 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!
07-19-2013 02:44 PM
zaskar14 How about the IAC (Idle Air Control)
07-19-2013 02:09 PM
JakeBreen
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.
07-19-2013 01:00 PM
squanto305 thanks
07-19-2013 12:45 PM
Big Sarge
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.
07-19-2013 12:39 PM
squanto305 excuse my ignorance. what code do i need get read?
07-19-2013 12:21 PM
Big Sarge 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)
07-19-2013 12:18 PM
squanto305
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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