2000 Jeep Cherokee Inconsistent rpm with cruise

2000 JEEP CHEROKEE
150,000 MILES • 6 CYL • 4WD • AUTOMATIC
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JPH4219
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  • 2 POSTS
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
Apr 27, 2010 at 3:23 AM
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LEGITIMATE007
  • ✓Experienced Mechanic
  • 5,121 POSTS
is there a check engine light on
Apr 28, 2010 at 7:01 AM
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JPH4219
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No light, has been running fine and still does aside from this issue.
Apr 28, 2010 at 9:07 AM
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LEGITIMATE007
  • ✓Experienced 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.
Apr 28, 2010 at 1:52 PM
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