How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask sprinkles08 Your Own Question
sprinkles08
sprinkles08, ASE Certified Technician
Category: Jeep
Satisfied Customers: 21570
Experience:  Chrysler/Dodge/Jeep Master Certified, ASE Master and Advanced Certified, Trans and Hybrid Specialist
9825021
Type Your Jeep Question Here...
sprinkles08 is online now
A new question is answered every 9 seconds

Grand Cherokee Laredo: , the rpm jumps all the time

Customer Question

Hi, the rpm jumps all the time
Submitted: 1 year ago.
Category: Jeep
Expert:  sprinkles08 replied 1 year ago.
Hello and welcome to JustAnswer!
I'm assuming either the idle is fluctuating or RPM's fluctuate on their own while driving at a steady speed.
If you have a 3.7 or 4.7 then the most likely cause would be an erratic signal from the throttle position sensor. When a TPS gets worn it can start to create voltage fluctuations in it's signal. The powertrain control module will see the fluctuations and think the throttle is opening so RPM's will follow.