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Speedometer jumping

Tiny
TONYMM
  • MEMBER
  • 1997 JEEP GRAND CHEROKEE
  • 5.2L
  • V8
  • 4WD
  • 200,000 MILES
At any speed, speedometer jumps to 120 mpg on a incline through transmission out of gear. Where on transmission is sensor located and looks like. Would this make vehicle run hot, over heat also?
Sunday, July 9th, 2017 AT 11:39 PM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
The speed sensor has nothing to do with overheating that may be a blown head gasket and should be either pressure or chemically checked. Auto parts rent the tool and system has to be full of coolant. See link.
https://www.2carpros.com/articles/head-gasket-blown-test

Speed sensor is at rear of transfer case. also, try unplugging dash then plugging back in.
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Monday, July 10th, 2017 AT 6:17 AM

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