I found a neat lube tool that goes on the end of the speedo cable and fits right on the grease gun. DONT pump too much in their, just a little at a time...
speedo jumps
Thread Starter
Safety Car
Joined: Jun 2002
Posts: 4,135
Likes: 1
speedo jumps
i did a search on speedo repair,,got only 2 results, ive repalced every cable in my car,,but now i notice when going from a stop,,the speedo is lagging,,im doing say 35-40 --45 and as i accelerate its on 20--35 them jumps to the speed im doing,,this doesnt happen every time but i have noticed it, im thinking the guage is 30 + years old and probably needs cleaning,,which while im in there,,, so do the contacts on the dimmer for the interior lights,,anyone got a good source of instructions for removal and servicing,,or should i send it out to a instrument rebuilder ? just thought someone else may have experenced the jumping needle also and have tips to share,,,,,,,,,,,,,,,,thanks ,,,, carl------------------------------
Pro
Joined: Mar 2006
Posts: 724
Likes: 1
From: NY
St. Jude Donor '06
Nice car! It is possible that the gear in the tranny, where the cable connects to may be worn. The teeth can wear out on those. Or, if I were you I would take apart the dash and then try spraying some WD 40 or something like that into the speedo. Maybe it's just a lubrication thing and it will free up whatever gets stuck. Either way you need to pull the speedo so you might as well try this first and then if need be, have it fixed or buy a new head.
The other thing I just thought of is that it may be the length of the cable you replaced. On mine, I had a cable that was too long and the speedo kept doing what yours is and also sometimes didn't work. I took it to a guy who has been doing speedo's for like 50 years and he knew right away. He cut the cable and presto, it worked perfectly.
The other thing I just thought of is that it may be the length of the cable you replaced. On mine, I had a cable that was too long and the speedo kept doing what yours is and also sometimes didn't work. I took it to a guy who has been doing speedo's for like 50 years and he knew right away. He cut the cable and presto, it worked perfectly.
Racer
Joined: Dec 2004
Posts: 402
Likes: 2
From: Los Angeles
Originally Posted by zcorvette
Carl,
Every time I've had a jumping speedometer, the cable needed to be lubed.
Peter
Every time I've had a jumping speedometer, the cable needed to be lubed.
Peter
This makes sense. My speedo jumped until the cable snapped or the gear was replaced....can't remember which as it was over 15 years ago.
Suggest you check / replace the cable / gear as necessary. That should fix it.
Good Luck and beautiful car!
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Thread Starter
Safety Car
Joined: Jun 2002
Posts: 4,135
Likes: 1
new cables thruout entire car and all were installed with ''cable eze'' cable lube from corvette central,,ill look at the gear, in the tranny,,i remember a post a few years back about dust and the needle dragging in the guage,,but cant find it with search function,,wanted to re read it
Pro
Joined: Mar 2006
Posts: 724
Likes: 1
From: NY
St. Jude Donor '06
I understand that the cables are new, but I was talking about the length of the white piece inside the plastic. If the length of that is too long then the speedo will not be correct and will jump. It happened to me. You can check it on either side and cut off the white or inside piece of the cable just a little. When I had mine done the guy knew he correct length by heart. It's only supposed to stick out a certain length but I'm not sure what that is.