76 dancing Tach, how to fix?
Thread Starter
Le Mans Master
Joined: Apr 2003
Posts: 7,154
Likes: 1
From: I blame my Dyslexia MD
76 dancing Tach, how to fix?
How do you fix a dancing tach on a 76, it only dances around under a bit of acceleration, not all the time. Ive been told the cable has the 90 degree turn in it and grease it or get a new one, or get a 90 degree adapter. I have also been told that on the 76 they had some sort of printed circut that is the main problem w/ them. Which is most likley liable for this, and how do i fix it.
MAtt
thanks in advance
MAtt
thanks in advance
Drifting
Joined: Aug 2000
Posts: 1,758
Likes: 4
From: Medford, Or
Re: 76 dancing Tach, how to fix? (pillowmeto)
pillowmeto- In '76 all Corvette tachs were electronic. (no cable)You might get lucky and re-flow the solder connections on the circuit card. Last tach ('77) I repaired I had to replace the movement. The tach & the "Low fuel warning "lite circuits were one of GM's weak design.
Good Luck,
Dan
Good Luck,
Dan
Drifting
Joined: May 2003
Posts: 1,414
Likes: 2
From: Barrie
Re: 76 dancing Tach, how to fix? (7T6HER)
I have also determined that my circuit board is fried and had a local electronics shop replace a few diodes that where fried, however there must be more wrong because it still does not work :mad I found Ecklers is selling them for $60 does anyone know the discount number? Here is the url to the part http://www.ecklers.com/product.asp?p...6DH3FQP0AMFUV0
And here is a picture of my temporary solution (Bubba fix) you may find funny or sad :lol:
And here is a picture of my temporary solution (Bubba fix) you may find funny or sad :lol:
Safety Car
Joined: Jun 2001
Posts: 4,004
Likes: 2
From: Severna Park Md
Re: 76 dancing Tach, how to fix? (pillowmeto)
Those tach were designed to jump around to signal a possible problem with the ignition system. Before you go tearing into the tach thinking its wrong, check out all the tune up stuff like plugs, cap and wires. Also check for the presence and condition of the engine ground strap.
Thread Starter
Le Mans Master
Joined: Apr 2003
Posts: 7,154
Likes: 1
From: I blame my Dyslexia MD
Re: 76 dancing Tach, how to fix? (pillowmeto)
Ill try that last one first and check everything else, knowing how my previous owner did things, or the cheap shops he hired did, its probobly the tuneup stuff, well id say its the circurit, butill check anyways, would setting my timing do anything, just asking cause that is tune up related to ignition, and im gonna have it done this week.
MAtt
MAtt
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
Re: 76 dancing Tach, how to fix? (pillowmeto)
Jeemeny xmas guys, I can't beleive the amount of responses and no one hit the most likely cause yet....i'ts the tach 'filter' that black 1/2 inch dia 1.5 inch long cylinder clipped tothe engine somewhere near the dist. and has a wire from each end....that is in series with the Tach wire...white...NOW if it's missing or defective the tach jumps all over the place....it's no longer made either...you maybe able to find one in a junkyard...maybe not....
you can make one, according to a schematic and some Radio shack parts...
search this site for that information....I know someone posted it...
GENE
you can make one, according to a schematic and some Radio shack parts...
search this site for that information....I know someone posted it...
GENE
Drifting
Joined: Aug 2000
Posts: 1,758
Likes: 4
From: Medford, Or
Re: 76 dancing Tach, how to fix? (mrvette)
Jeemeny xmas guys, I can't beleive the amount of responses and no one hit the most likely cause yet....i'ts the tach 'filter' that black 1/2 inch dia 1.5 inch long cylinder clipped tothe engine somewhere near the dist. and has a wire from each end....that is in series with the Tach wire...white...NOW if it's missing or defective the tach jumps all over the place....it's no longer made either...you maybe able to find one in a junkyard...maybe not....
you can make one, according to a schematic and some Radio shack parts...
search this site for that information....I know someone posted it...
GENE
you can make one, according to a schematic and some Radio shack parts...
search this site for that information....I know someone posted it...
GENE
Dan
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
Re: 76 dancing Tach, how to fix? (vettedan)
Vettedan, ok, maybe I"m lucky so far....can be, never had a problem with the tach changeover I got used....
did have to make a filter though....included in my wiring harness now...
I had a '70 GTO.Lemans with a bad tach movement coil in it....that was expensive....
GENE
did have to make a filter though....included in my wiring harness now...
I had a '70 GTO.Lemans with a bad tach movement coil in it....that was expensive....
GENE
