erratic speedometer
Thread Starter
Burning Brakes
Joined: Jul 2008
Posts: 923
Likes: 81
From: MN
erratic speedometer
This is an odd one - stay with me on this.
At slower speeds the speedometer reads SLOW - meaning is shows I'm doing 20 when I'm really doing 25 or maybe 30.
Around 50-60 mph - it really accurate. Note: the closer to 50-60 the more accurate it becomes.
Above that speed it starts reading fast meaning - it shows 75 when I'm really doing 70.
While driving and maintaining a constant speed the speedometer doesn't fluctuate. It tracks rather smoothly.
One last note: It is possible I have the 2 scenarios mixed up - meaning slower speeds it reads faster, faster speeds, slower. I'm having a major brain cramp right now so I can't remember.
(It sucks getting old!!)
Any ideas?
At slower speeds the speedometer reads SLOW - meaning is shows I'm doing 20 when I'm really doing 25 or maybe 30.
Around 50-60 mph - it really accurate. Note: the closer to 50-60 the more accurate it becomes.
Above that speed it starts reading fast meaning - it shows 75 when I'm really doing 70.
While driving and maintaining a constant speed the speedometer doesn't fluctuate. It tracks rather smoothly.
One last note: It is possible I have the 2 scenarios mixed up - meaning slower speeds it reads faster, faster speeds, slower. I'm having a major brain cramp right now so I can't remember.
(It sucks getting old!!)Any ideas?
Team Owner
Joined: Oct 2000
Posts: 38,897
Likes: 1,925
From: Washington Michigan
If it's "slow" and changes to "fast" with speed (or vice versa), it's not related to the drive gearing - the issue is in the calibration of the speedo head, which has to come out and go to an instrument specialist to be re-calibrated. 
Melting Slicks
Joined: Jul 2004
Posts: 2,864
Likes: 195
From: Maryland
Joe Ray Corvette Parts in North Little Rock, Arkansas does speedometer degaussing.
He may be contacted at vettenut007@comcast.net or
Joe Ray Parts Co.
2025 Cedar Creek Rd.
N. Little Rock, AR. 72116
He may be contacted at vettenut007@comcast.net or
Joe Ray Parts Co.
2025 Cedar Creek Rd.
N. Little Rock, AR. 72116
Last edited by Donald #31176; Aug 2, 2013 at 04:59 PM.
