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Unread 08-16-2013, 08:08 PM   #1
Rino1425
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Speedo Issue

I have a 93 YJ with the I6. When i first got the jeep a few months ago, the speedo was not working at all. I pulled the cluster, and cleaned all the contacts and checked to make sure the ribbons were broken. All checked out good. Now, when i drive, the harder you press the pedal, the speedo moves. Yes, i understand that is what it is suppose to do, but i can floor it in first and it will go all the way to 100, then let off and it drops to zero. Its almost like its getting a signal from something else. Any one ever have this issue or know what to do? Also, when driving, it just "bounces" around like 20 to 60. Like its takes its reading off how much throttle input i am giving it. ie. it goes to 20 when i give it 20% throttle.

Thanks,

Jon

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Unread 08-16-2013, 08:39 PM   #2
leafsprings
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I had the samething with my 93. Mine was the output shaft was loose on transfer case. Place to start. Hope it helps
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Unread 08-16-2013, 08:53 PM   #3
Rino1425
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Thanks, i just replaced the output shaft seal and raceway a few weeks ago. Didnt notice anything loose in there. Was your output shaft not making contact with the speedo gear?
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Unread 08-18-2013, 07:40 PM   #4
Rino1425
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anyone have some suggestions?
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Unread 08-18-2013, 07:45 PM   #5
jokerchief462
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VSS gone bad???
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Unread 08-19-2013, 04:29 PM   #6
Rino1425
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Thats what i thought, but i pulled it and it looks good. Any way to test it?
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Unread 08-19-2013, 05:10 PM   #7
jbrown73
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I had a speedo issue one time, my junk was too big to wear one! lmao!

Seriously, my speedo wouldn't work at all. Pulled the speedo out & put a drill on the back and she ran up fine. Disconnected at the xfer case and did the same with the drill and again ran up fine. Thinking the square shaft inside the speedo cable looked too short at the xfer case end, I ordered a new cable, installed, and nothing. Ended up finding the speedo gear hold down tang was upside down for my size gear so the plastic gear was not making contact within the xfer case.. Rotated it 180* and she runs up like a champ.
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The only thing I can say is to close your eyes. Seriously. If you close your eyes and pay attention to your finger tips, you'll be able to feel the nuts better and manipulate them easier.
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Unread 08-19-2013, 05:25 PM   #8
jokerchief462
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I'll look when I get home for a VSS troubleshooting page.
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Unread 08-24-2013, 10:04 AM   #9
Rino1425
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I unplugged the sensor on the transfercase and the speedo stopped working. So im assuming its the sensor that is bad?
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Unread 08-24-2013, 10:53 AM   #10
pasinbuy
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Originally Posted by jbrown73 View Post
I had a speedo issue one time, my junk was too big to wear one! lmao!

.
Too funny. That one almost got past me..... I had to read it two times.
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Unread 08-24-2013, 11:28 AM   #11
XJ93
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There was a thread a while back in which someone else had the same issue. One way to test it that was mentioned was using a drill on the end of the VSS while connected tot he harness and watch the speedometer. If it is still twitchy I would think that it is the VSS itself.
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Unread 09-02-2013, 12:06 PM   #12
Rino1425
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Did the drill test and the speedo works fine. The gear on the sensor looks good and the same with in the transfer case. Any idea what it could be?

Also, the gear has the number 30 on it if that helps

Thanks
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Unread 09-02-2013, 02:05 PM   #13
jbrown73
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In the pic below you can see the slots machined into the transfer case speedo output with the fork aligned into a pair of those slots. The speedo output is off center in that component to accommodate different size gears within the xfer case. Unbolt the fork and rotate the output 180* and tighten the fork back down. This will rotate the speedo gear inside the xfer case into position. My gear had '30' on it also and it was just a matter of it being installed 'upside down' by the PO.
image.jpg  
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"The Constitution is not an instrument for the government to restrain the people, it is an instrument for the people to restrain the government....." - Patrick Henry

Quote:
Originally Posted by Rproject View Post
The only thing I can say is to close your eyes. Seriously. If you close your eyes and pay attention to your finger tips, you'll be able to feel the nuts better and manipulate them easier.
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Unread 09-02-2013, 03:30 PM   #14
Rino1425
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While i was under there, i tried that, (Rotate 180*) and it didnt work. Mine does not seem as if it is off center. I noticed on yours, you have marks that are a few degrees different. Do you think i may have rotated it to far?
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Unread 09-03-2013, 11:55 AM   #15
jbrown73
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Nah, those marks that are a few degrees from where it is at now are from the PO's 'mechanic' torquing down on the fork without it being in one of the slotted grooves.....he made his own set of slots for me to figure out were not part of the original design.

Sounds to me like you need to replace the VSS.
__________________
"The Constitution is not an instrument for the government to restrain the people, it is an instrument for the people to restrain the government....." - Patrick Henry

Quote:
Originally Posted by Rproject View Post
The only thing I can say is to close your eyes. Seriously. If you close your eyes and pay attention to your finger tips, you'll be able to feel the nuts better and manipulate them easier.
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