Topic: Tach Quit
in Forum: C3 Engines
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The Tach on my '79 quit today while I was warming it up. It just went down to zero and didn't move at all.
I shut it off and restarted it. The Tach showed some small signs of life but wasn't reading as high as I know it should have been.
After it warmed up I noticed the Tach was reading correctly.
I put about 50 miles on it today. It ran fine and the Tach read correctly for the rest of the day.
Any ideas???
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At first I was going to suggest checking the tach drive cable connections at each end. I then realized that your tach is electric, not mechanical. Anyway check the connections at the distributor........wire push on. The circuit boards get screwy if you still have the original one. There are improved boards to replace the outdated old ones. Also there is a tachometer filter in your circuit that can be a problem.
corvette440hp
Former Member
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Mounds View, MN - USA
Joined: 5/24/2007
Posts: 1031
Vette(s): 70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe
Almost always when our customers have this problem, it is solved with the new tach board. It is just over $100.00, so you can afford to experiment.
Larry
Larry
Lifetime MemberOceanside, CA - USA
Joined: 11/19/2003
Posts: 191
Vette(s): 1978 Silver Anniversary model. Original L82 engine, 700r4 trans, edelbrock intake, thorly headers, rack&pinion steering, mono rear and front spring, MSD 6A box
If you find the solution pls post. I've got the same issues.
After reconnecting it at the distributor, no problems at all for the last three days. (About 100 miles and numerous restarts).THX 440HP!
Larry,
I'll be in touch for a new tach board if the problem returns.
in Forum: C3 Engines
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