Bouncy Speedo needle - JeepForum.com

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post #1 of 24 Old 09-19-2011, 10:16 AM Thread Starter
usererror
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Bouncy Speedo needle

My speedometer needle bounces once I get over 60mph. What causes this? Is it a speed sensor going bad?

I rarely go over 60mph, but I am curious. It is one of the few flaws with this Jeep.

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post #2 of 24 Old 09-19-2011, 10:23 AM
CSP
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Speedo cable needs lubrication.
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post #3 of 24 Old 09-19-2011, 06:09 PM Thread Starter
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Is that the cable coming from the accelerator pedal to the throttle?

Is it difficult to remove & lube? Tips, suggestions for doing so?
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post #4 of 24 Old 09-19-2011, 07:14 PM
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This is the cable going from the speedometer to the transfer case (if you have cruise control, it would have a split at the cruise control unit and you would have 2 cables).

It isn't hard, just disconnect both ends, pull out the center part, lube it, put it back together, done.

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post #5 of 24 Old 09-19-2011, 08:45 PM Thread Starter
usererror
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Thanks, BJ. I do have cruise control. I will follow the second cable coming off the cruise unit that goes to the transfer case. Thanks!

I would guess that once this issue is fix it'll be a bit easier for the Woody to set the cruise when its going what I think is 62mph...
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post #6 of 24 Old 09-20-2011, 06:28 PM Thread Starter
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I must be missing something. Forgive me, I'm not a super guru on engines. Am I looking at the throttle?

The pic below shows two cables, the one with the string of beads goes to what I think is the Cruise Control unit. The lower cable goes into the firewall to the gas pedal I assume. the one below with the spring, goes to another metal arm. Am I looking at the wrong thing?

Thanks



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post #7 of 24 Old 09-21-2011, 04:42 AM
megajeep
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Those are your throttle cables. The speedo cables come up from the transfer case to the cruise control sensor near the firewall near the area where the wire harness comes through the firewall under the brake vacuum booster where. There are actually two cables one comes up from the transfer case and screw into the cruise control sensor. Then the second one goes from the sensor to the speedometer.
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post #8 of 24 Old 09-24-2011, 08:25 AM Thread Starter
usererror
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Ah, I think I found it, I started at the transfer case this time. Is this it below in the upper right corner?



It then goes up by the firewall and goes into another small device and then comes out and goes into the firewall toward the instrument cluster, it never goes to the cruise unit?



Do I run any risk of breaking anything easily trying to unscrew the connector from the transfer case? I tried by hand wouldn't budge, guessing I'll have to use pliers or vice grips...
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post #9 of 24 Old 09-24-2011, 09:09 AM
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No, you should be ok, go ahead and use some pliers to loosen it and it will come right off.

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post #10 of 24 Old 09-08-2013, 01:18 PM Thread Starter
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Fast Forward 2 years!

I disassembled the Speedometer cable sections today. I went to the parts store and asked them what I needed and they said I needed graphite powder. I got a tube and puffed it into each end of the cable shielding. As I pushed the actual cable back in, I puffed a bit more every foot or so. I did this on both sections and re-assembled. I took the Woody out for a test drive and I seem to have some improvement. I can now get up to 55mph before it starts bouncing past 55 and higher.

Does this mean I need to do more graphite powder? The inner cable itself was super clean. Picture are below. What is the electrical component that is in series with the speedometer cable?



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post #11 of 24 Old 09-08-2013, 05:19 PM
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I'd pull the cables out of the jacket and clean both very well, including the inside of the jacket. Some thing like Simple Green and water should help.

Then put it back together with the graphite like you did already. That electrical component is part of the cruise control I believe.
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post #12 of 24 Old 09-09-2013, 05:16 AM Thread Starter
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CSP - Thank you. I did not think to clean the inside of the jacket. I Just pulled the cables out, inspected them, they were shiny and clean, and then applied the graphite. I'll give that a try next weekend.

Does any new grease need to be applied at the transfer case connection?
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post #13 of 24 Old 09-09-2013, 08:11 AM
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No, do not add any grease.
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post #14 of 24 Old 09-09-2013, 05:33 PM
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It's probably the speedo head if it's only bouncing above a certain speed.

At 35 mph mine would bounce and read 10 high and stay there. Brought the speedo into the shop and they found play in the bushing. They rebuilt and and regaussed it for $60. Smooth as silk now.
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post #15 of 24 Old 09-12-2013, 02:51 PM Thread Starter
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Quote:
Originally Posted by pcoplin View Post
It's probably the speedo head if it's only bouncing above a certain speed.

At 35 mph mine would bounce and read 10 high and stay there. Brought the speedo into the shop and they found play in the bushing. They rebuilt and and regaussed it for $60. Smooth as silk now.
You mean the speedo head inside the instrument cluster? It is only after a certain speed. Certainly something else I will check out as a possibility.

Is this something my local mechanic can fix, or would/should have experience with?
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