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Discussion Starter · #1 ·
Hello all,

A couple of weeks ago, I was driving in my TJ and the RPMs were going up and down, then it dies. I start the jeep up again and now it sounds like it's sputtering. I managed to get the Jeep back to my driveway. So there was a check engine light, 11, 12, and 55.

I checked and a couple posts I've seen about replacing the crankshaft position sensor. I got this done, reset (crank 3 times) the computer, and I still get the same problems. I read elsewhere about the TPS since it's a service bulletin. I wasn't sure about going out and buying one if it didn't solve the problem, so I just disconnected it and cleaned it with some electronic cleaner, but that didn't do anything either.

Any suggestions?
 

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Ideal Air modular. On side of air intake has two screws holding it on. Probably got some trash in it and its not sealing as it should. I would first try cleaning it with carb cleaner in the orifice and the pin. If that's not a help change the modular and the project should be done for another 50k miles.
 

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Discussion Starter · #3 ·
Any one got pics of this air modulator? I tried googling but didnt see anything. Is it opposite of the air intake by the intake manifold towards the firewall?
 

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IAC, Idle Air Control solenoid. It's on the passenger side of the throttle body (assuming yours is like mine, 2000 4.0L I6 motor). My idle was varying quite a bit so i replaced the TPS (Throttle Position Sensor) and took the throttle body off and cleaned the IAC and throttle body. Runs and idles nice now.
 

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Discussion Starter · #7 ·
I will try it this weekene. I also read about the camshaft position sensor and got one. To my surprise, since mine is a 97, it still uses a distributor cap so I will be returning the camshaft sensor. I did order a new cap and rotor, which I will try that also.
 

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Discussion Starter · #8 ·
Ok, so I cleaned the throttle body super clean with a toothbursh and all. I even took the idle air control and cleaned that as well. All of the sensors to the throttle body I used electronic cleaner plus dielectric grease. I still get the rough idle and white smoke.

I also replaced the distributor cap and the rotor.

Any ideas?

https://youtu.be/ZmRFStw0lQs
 

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397 Posts
Try disconnecting the upstream o2 sensor, use only ntk/ngk if need to be replaced.
 
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