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Unread 01-22-2014, 07:15 PM   #1
mopar_monkey
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speedometer issues on new to me mj

Had my mj about a week now, I have had many jeeps before but was never able to find a nice mj til now. I notice the past two days that while driving the speedo will stop working and after a few minutes will start working again. It doesnt happen when I hit a bump and everything else still works. Is this a common issue? I love this mj and am trying to make it uber reliable as I plan on taking a trip with my son to death valley in the next couple of yrs.

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Unread 01-22-2014, 07:22 PM   #2
juicy
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1986 MJ Comanche 
 
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Chreck out the cable at the output for the drive shaft or behind the cluster...
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Unread 01-22-2014, 07:36 PM   #3
mopar_monkey
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Mine is electric.not sure if there is a loose connector. But since it doesnt change when I hit bumps I am thinking it's not a loose or broken wire.
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Unread 01-22-2014, 07:37 PM   #4
mopar_monkey
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It's a 92
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Unread 01-22-2014, 11:09 PM   #5
juicy
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1986 MJ Comanche 
 
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Wierd didnt know mjs went past the 90s still kinda new with em the sensor could just be failIng if its electric id take the gauge cluster out get your voltmeter out and see what u get from the sensor..see if its faulty i guess lol
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Unread 01-23-2014, 05:56 PM   #6
87MJTim
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1987 MJ Comanche 
 
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Check the speedo gear. In the tcase for 4wd, or in the trans for 2wd. If the teeth are worn, they may not be catching to signal the speed.

Or, pull the gauge cluster and clean the speedo gauge.

Otherwise, inspect the wires from the gear to the cluster.
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87 Comanche, 4.0, BA10/5, D44
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Unread 01-27-2014, 05:48 PM   #7
MLG
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1991 MJ Comanche 
 
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I have owned my 91 MJ for 22 years, and within the last 2 years both the tach and speedo have shown the same symptoms you describe. I've cleaned/inspected the instrument cluster connector, the firewall connectors, and the ECU connector, and have yet to find a single suspect-looking connection or wire. I'm strongly suspecting either a bad ground connection, or a faulty cluster, though I've yet to verify either. I know the speed sensor is working fine because the cruise control works fine. I know the tach sensor is working fine because the "Shift Now" light comes on @ 2K rpm. When I finally find and fix the darn thing, I'll post it here. ANd if anyone here has slain this particular dragon, please tell us how.
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Unread 01-28-2014, 08:19 AM   #8
Caish
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when did they go electric?
my 87 XJ is mechanicl, the sons MJ 88 is too, and so is the 91 I pulled the tranny/xfer case from we put in his truck.

If you have help, pull he cabe drive from the case and check he gear, then I would also pull the cable loose on both ends and coat it in grease
and look for burrs etc. If all that is good. its down to the speedo itself.
Go find a gauge cluster from a junkyard XJ or MJ and swap it out.
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Unread 01-28-2014, 01:25 PM   #9
mopar_monkey
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90 or 91 they went electric.
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Unread 01-28-2014, 05:57 PM   #10
MLG
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My '91 is most definitely electronic. I have seen a 90 that was too, though the other '90 I'm familiar with is mechanical.
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Unread 01-28-2014, 09:27 PM   #11
87MJTim
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91 was when it went electric. The trans and tcase don't matter if it is mechanical or electric.
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87 Comanche, 4.0, BA10/5, D44
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Unread 01-28-2014, 09:32 PM   #12
87MJTim
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1987 MJ Comanche 
 
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Btw search for cruiser54's tips for ground updates
Go to www.comancheclub.com for more MJ info.
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87 Comanche, 4.0, BA10/5, D44
84 CJ7, 4.2, AX15 (Formerly T5)
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