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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > Brief rpm increase while driving.

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Unread 06-25-2013, 12:29 PM   #16
xcaliber81
Registered User
1994 ZJ 
 
Join Date: Jul 2012
Location: Prince George, B.C
Posts: 3,078
So since I had some fluid sucked out of my trans it stopped the rpm increase.

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Unread 05-23-2014, 09:03 AM   #17
haro
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2001 XJ Cherokee 
 
Join Date: Jan 2014
Location: corcoran, MN
Posts: 5
Read the threads but no sure I follow all. I have 2001 cherokee sport 4x4 and I have noticed same problem. Occasionlly while driving at steady speed (around 50-55mph) I will notice tach go from 1800-1900rpm to 2000-2100rpm for an instant (2-3 secs) and then return to 1800-1900rpm. Oh I did test while driving at 50-55mph of just touching brake pedal and rpm increases to 2000-2100rpm and then return to 1800-1900prm. I see Zee Jay talks about brake switch. Is there more I can do to determine if its brake switch and not transmission? If response says bad brake switch is it switch for brake lights or is there some other switch and location? Car upshifts and downshifts while driving as normal and I don't feel and slippage. Thanks
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Unread 05-23-2014, 09:33 AM   #18
ZeeJay1997
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1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,879
Quote:
Originally Posted by haro View Post
Is there more I can do to determine if its brake switch and not transmission? If response says bad brake switch is it switch for brake lights or is there some other switch and location?
since you have an XJ, i can only guess that the brake switch is the same as a ZJ. it's above the brake pedal. Inexpensive and fairly easy to change. The guys over in the XJ forum can give you a more definite answer.
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