2000 Jeep Cherokee Inconsistent RPM with cruise

Tiny
JPH4219
  • MEMBER
  • 2000 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
On flat terrain highway at speed limits with either cruise on or holding pedal at steady speed. Have noticed rpm indicator fluctuates 350-500rpm, although speedometer varies 3-5 mph. Car recently had tune up 5k miles ago. Has had regular maintenance (all fluids changed) 3k miles ago. TIA
Tuesday, April 27th, 2010 AT 10:23 AM

3 Replies

Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
Is there a check engine light on
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Wednesday, April 28th, 2010 AT 2:01 PM
Tiny
JPH4219
  • MEMBER
  • 2 POSTS
No light, has been running fine and still does aside from this issue.
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Wednesday, April 28th, 2010 AT 4:07 PM
Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
I think you are starting to have an issue with your crank sensor. It doesnt trigger a light, but when it goes bad you will begin to see an issue with the rpm, as it monitors the crank shaft. I would say there is a possibility for the vss(vehicle speed sensor) to possibly have a part in this, but it usually triggers a light so I would focus on the crank sensor. Have them put it on a scan tool and monitor the sensor, this will tell you that it is weak.
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Wednesday, April 28th, 2010 AT 8:52 PM

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