1996 sport rpm gauge is off about 200-300 rpms - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Cherokee & Comanche Forums > XJ Cherokee Technical Forum > 1996 sport rpm gauge is off about 200-300 rpms

Stainless Steel Door Hinge PinsPoly Door Hinge BushingsFS: 2007-2013 Jeep Wrangler "HALO" Angel Eye Kit

Reply
Unread 08-13-2013, 09:46 AM   #1
oldschool88
Registered User
1996 XJ Cherokee 
 
Join Date: Nov 2012
Location: cadillac, michigan
Posts: 41
1996 sport rpm gauge is off about 200-300 rpms

1996 cherokee sport.. rpm gauge is low.. sometimes way to low.. around 1500 rpms when it should be around 2000.. i notice it while accelerating.. at idle it always reads around 750.. my 1992 laredo did the same thing before i sold it.. from what i understand the rpm readings come from the pcm.. how can i fix this ?

oldschool88 is offline   Reply With Quote
Unread 08-13-2013, 10:46 AM   #2
bigbill888
Registered User
1996 ZJ 
 
Join Date: Nov 2009
Location: michigan
Posts: 966
Did you hook up another tachometer to it? How do you know its reading low?
__________________
96 ZJ Laredo, 4.0, 242, 230K
95 ZJ Limited, 4.0, 242, 140K
98 XJ Sport, 4.0, 231, 140K
All work well
bigbill888 is offline   Reply With Quote
Unread 08-13-2013, 11:07 AM   #3
CJ7-Tim
Real Jeeps have dents.
 
CJ7-Tim's Avatar
2000 XJ Cherokee 
 
Join Date: Apr 2002
Location: out in the garage - Minneapolis, Minnesota
Posts: 21,423
It might bug you, but it isn't a problem worth the time or effort to fix.
__________________
.

According to the National Shooting Sports Foundation, AR-15 sporting rifles account for nearly 20% of all U.S. firearms sales.

Progressive Liberalism: Bringing you new Healthcare ideas so wonderful, they have to include mandatory participation ......

Originally Posted by Ronald W. Reagan: Government is not the solution to our problem; Government is the problem.
CJ7-Tim is offline   Reply With Quote
Unread 08-13-2013, 11:08 AM   #4
oldschool88
Registered User
1996 XJ Cherokee 
 
Join Date: Nov 2012
Location: cadillac, michigan
Posts: 41
no i didn't hook up another tach to it. sometimes it reads normal, acceleration patterns and shift patterns are the same.. then it will all of a sudden read 1500 rpms while im accelerating instead off the usual 2000 rpms. its kinda hard to explain.. but i know the rpm gauge is off.. when im accelerating i ushally am around 2000-2200 rpms.. when the rpm gauge is acting up its around 1500rpms, with the same amount of throttle. sorry for any confusion, im trying to explain it best i can..
oldschool88 is offline   Reply With Quote
Unread 08-15-2013, 06:59 AM   #5
JWELK
Registered User
1999 XJ Cherokee 
 
Join Date: Apr 2011
Location: Ceiba, PR
Posts: 763
I have a 99, the tach seems to be a combination of the Crankshaft Position and Cam Shaft Position sensor inputs. It seems they go to a counter circuit in the PCM and the resulting digital output is sent to the tach. It is similar on my 95 Wrangler. However the gauge is different. There is uprocessor in the gauge that counts the pulses and then adjusts an electromagnet in the gauge to give the proper reading. As you don't mention other issues, I would venture the tach gauge is the culprit. Again that is for a 95, I don't know about the '96.

Let us know,

Regards,

Jim W
JWELK is offline   Reply With Quote
Unread 08-15-2013, 08:38 AM   #6
oldschool88
Registered User
1996 XJ Cherokee 
 
Join Date: Nov 2012
Location: cadillac, michigan
Posts: 41
Thanks for the info , greatly appreciated... I will dive deeper into it once I get some time.. I will update this post when I figure it out.. Thanks again.
oldschool88 is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.