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2/16/12 10:28pm - Original Message: 'speedo trouble'
81 toy
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wylie, TX - USA

Vette(s):
1981 coupe red on black

Joined: 12/2/2009
Posts: 25
hey has any one out there ever had problems with there speedo bouncing or jumping at low speeds say under 10 mph with the speedo bouncing from 0 to 35 but once the speed picks up the problem seems to go away i thought i had found the problem before i removed the cable from the transducer to the trans by just removing the the center cable from the jacket and found that the cable end that goes in the trans there is a small square piec of metal welded or soidered to the cable well that was kinda just barley hangin on to the cable so i went to a speedo shop and they repaired the end for me and i lubed it with white lithiam grease before reinstalling it and it still does the same and i have replace the transducer because the cruise control did not work and was hoping that was the problem because now the cruise works like it is suppost to with resume and accel functions working and i had a new face plate installed on the speedo in the dash and they told me that they checked out the head mechinsam and that worked fine the only piece of the puzzle that we have not checked it the small cable from the transducer to the head unit any yhought or ideas would be great
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2/16/12 10:56pm - Reply: 'Re: speedo trouble'
kwoody
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Tucson, AZ - USA

Vette(s):
1982 Black/Tan Leather Build Code C09E Bronze TTop CrossFire Fuel Injection L83 85 Fuel Pump Auto Axle 2.72 Firestone Firehawk Indy500

Joined: 7/11/2010
Posts: 415
Hello,

My 82 did just as you described but, it was the cable to the transmission from
the cruise control. The guy that replaced it said it had a kink in the end of the
cable that would catch as slow speed and work smoothly after about 20 mph. 
New cable fixed the problem.

Good luck.

Keith


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2/16/12 11:09pm - Reply: 'Re: speedo trouble'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19458
I'd been leaning toward the short cable from the transducer to the speedo head, too. If it was anything on the lower end(speedo gears, lower cable, etc), the cruize wouldn't work well. Pull the short cable out and clean/lube it up, and see how that works....

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2/17/12 9:17am - Reply: 'Re: speedo trouble'
Jaws79 Lifetime Member
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Sykesville, MD - USA

Vette(s):
1979 Corvette Coupe Corvette Light Blue Midnight Blue interior Mirrored Glass T-tops

Joined: 4/27/2008
Posts: 4211
I had the same problem Keith did. The lower cable on mine, though was pinched where someone had run over something. Put a new lower cable and problem went bye-bye!
 
Barry
 
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2/19/12 9:42am - Reply: 'Re: speedo trouble'
81 toy
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wylie, TX - USA

Vette(s):
1981 coupe red on black

Joined: 12/2/2009
Posts: 25
hey bud thanx for the info okay it was the bottom cable we took it out and cleaned it good and lubed it and it works much better thanx
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2/19/12 9:44am - Reply: 'Re: speedo trouble'
81 toy
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wylie, TX - USA

Vette(s):
1981 coupe red on black

Joined: 12/2/2009
Posts: 25
yep just as you called it we removed the cable from the jacket and cleaned it good and lubed it well and it works about 99% better well enough that i am not going to replace the whole cable assy thanx for the help
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2/19/12 3:23pm - Reply: 'Re: speedo trouble'
dskopp
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Oak Creek, WI - USA

Vette(s):
1981 Great White Shark. Red Interior, 350/190hp. PS, PB (SS), A/C CC, T-Tops, Going to remain as Stock as possible. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vetts Car Club. 175,000 Original miles!!

Joined: 5/21/2008
Posts: 1956
Keith,
Glad to see you got your speedo problem resolved!!  This is the place for them hard to find C-3 answers.  Let me know if I can be of any assistance to you, I have an 81 also and love to find out new things about it.  I may have some info that could help you in the future.  P.M. me and let me know!!
DanBig smile


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2/25/12 11:01am - Reply: 'Re: speedo trouble'
dwright Gold Member
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Victor, NY - USA

Vette(s):
2004 Commemorative Edition Coupe, Auto w/HUD. 13K miles in 2015. Sold 1982 Red Coupe

Joined: 7/12/2004
Posts: 6757
9 out of 10 times it will be the lower cable.
The problem is it gets all the road crap. The upper one is more protected.
The best thing to do is remove it once a year, clean it, lube it and put it back carefully, to be sure it is properly installed in the transmission.
I have replaced mine 2 or 3 times since 2004.
Of course the ones you get now are not high quality, so that is another reason they don't last for many miles.


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2/26/12 9:33am - Reply: 'Re: speedo trouble'
lukesvette Lifetime Member
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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6806
A new cable took care of my speedo problems as well...

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