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My 02 4l tj sahara has rough idle and appears to speed up…

Customer Question
My 02 4l tj...

My 02 4l tj sahara has rough idle and appears to speed up and down when holding the pedal steady,the jeep has 80 k on it been doing this for 2 years, Had complete tune up ,injectors cleaned ,oxy sensor changed,throttle sensor changed,wires changed, Man i am all changed out,It is bad in the morning, it warms up park it start before it cools down all 6 cylinders are good,it feels like one cylinder is dropping , Note in cold winter weather it does not seem to do itout,I bought the jeep new , my third,took good care of it HELP PLEASE.

Mechanic's Assistant: Are you fixing your 80 yourself? What have you tried so far?

No, paying so called pros

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Well i believe i said it all execpt for the frustration

Submitted: 7 months ago.Category: Jeep
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Answered in 1 minute by:
9/29/2017
Jeep Mechanic: Amedee, Jeep Technician replied 7 months ago
Amedee
Amedee, Jeep Technician
Category: Jeep
Satisfied Customers: 27,806
Experience: ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector
Verified

Hello and welcome!

My name isCustomerand I can assist you with your question.

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Jeep Mechanic: Amedee, Jeep Technician replied 7 months ago

You are now connected with a mechanic.

I am very sorry you're having this issue with your vehicle.

I will try my best to answer all of your questions.

However, before we get started, please let me mention a few things.

  • I don't know your skill level or background.
  • I also don't know the vehicle's history other than what you have and provide me with here on this page.
  • Please keep in mind, I cannot see the vehicle and I am not there to run the tests and check things as needed. My answers are solely based on the information you provide me with.
  • If at any point you would like to speak on the phone, please request a phone call on your end and will call you right away.
  • If you don't understand any technical terms or anything that I mention (component tests or theory or operation), please let me know and I will provide you with a more in debt explanation or answer.
  • Please understand that I am here to help.
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Jeep Mechanic: Amedee, Jeep Technician replied 7 months ago

Was the idle air control motor replaced? If not, this could very well be the root cause.

Also, if the throttle position sensor has been replaced, this condition can be caused by an air/vacuum leak as well. I would recommend looking close for air/vacuum leak first near the intake manifold and gasket, throttle body and gasket as well as any vacuum hoses/lines and fix or replace any as needed. If all checks out good, replace the IAC motor (if it has not been replaced).

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Jeep Mechanic: Amedee, Jeep Technician replied 7 months ago

.

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Amedee
Amedee, Jeep Technician
Category: Jeep
Satisfied Customers: 27,806
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Experience: ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector

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