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Tachometer flucuations

Tiny
SJJEEPGIRL66
  • MEMBER
  • 2002 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 126,000 MILES
2002 Jeep Grand Cherokee after doing 70 mph when you begin slower speeds the Tach fluctuates and car experiences "hiccup". May do 4-6 times in a row before smoothing out. Replaced Cam, Crank and Throttle Position sensors, Coil Pack, Plugs and fuel filter. We are at a loss here.
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Saturday, August 13th, 2011 AT 4:26 PM

3 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Check for applicable trouble codes. Some of the name brand autostores used to check codes for free. My first thought was an issue with output speed sensor circuit? There multiple issues that could cause that tach problem.
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Saturday, August 13th, 2011 AT 4:50 PM
Tiny
MULDOON
  • MEMBER
  • 79 POSTS
Would love to know the solution with this jeep and tacometer, would you share the answer, thanks Declan
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Monday, December 26th, 2011 AT 3:32 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
This is an older post. I don't know if the original poster will respond?
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Monday, December 26th, 2011 AT 5:25 PM

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