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Topic: tac jump

in Forum: C3 Electrical


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tac jump (1/5)
 9/21/10 12:24pm
jose's 79
Former Member
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bethpage, NY - USA

Vette(s):
stock original 1979 L82.

Joined: 7/19/2010
Posts: 34

installed a new tac circuit board a few months ago. yesterday the tac started jumping up and down and then frozen, but went back to zero when i shut the car off. whats happening, and ho do i correct it?
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tac jump (2/5)
 9/21/10 1:55pm
yostusota
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York, PA - USA

Vette(s):
1969 daytona conv. all original 350 350 380 4 sp w/air..and hard top

Joined: 5/18/2010
Posts: 1518

There is a reset that you have to do after you replace the board..lukesvette has the skinny on that..
Rich

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My first parade at Carlisle 2010
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tac jump (3/5)
 9/21/10 2:54pm
lukesvetteLifetime 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: 6812

Re-zeroing the tach will not cure a bouncing issue - just aligns the start point to 0 RPM with the ignition in the run position and the engine off.... Sounds like either the tach filter or the new tach board has an issue...
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tac jump (4/5)
 9/21/10 4:39pm
manchestersharkLifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 2388

Check for bad ground.

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Click on image for full view

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tac jump (5/5)
 9/22/10 2:05pm
jose's 79
Former Member
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bethpage, NY - USA

Vette(s):
stock original 1979 L82.

Joined: 7/19/2010
Posts: 34

where is the ground? off the distributor?
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