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Rino1425 08-16-2013 08:08 PM

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.



leafsprings 08-16-2013 08:39 PM

I had the samething with my 93. Mine was the output shaft was loose on transfer case. Place to start. Hope it helps

Rino1425 08-16-2013 08:53 PM

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?

Rino1425 08-18-2013 07:40 PM

anyone have some suggestions?

jokerchief462 08-18-2013 07:45 PM

VSS gone bad???

Rino1425 08-19-2013 04:29 PM

Thats what i thought, but i pulled it and it looks good. Any way to test it?

jbrown73 08-19-2013 05:10 PM

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.

jokerchief462 08-19-2013 05:25 PM

I'll look when I get home for a VSS troubleshooting page.

Rino1425 08-24-2013 10:04 AM

I unplugged the sensor on the transfercase and the speedo stopped working. So im assuming its the sensor that is bad?

pasinbuy 08-24-2013 10:53 AM


Originally Posted by jbrown73 (Post 15812784)
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.

XJ93 08-24-2013 11:28 AM

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.

Rino1425 09-02-2013 12:06 PM

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


jbrown73 09-02-2013 02:05 PM

1 Attachment(s)
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.

Rino1425 09-02-2013 03:30 PM

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?

jbrown73 09-03-2013 11:55 AM

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 time now is 08:53 PM.

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