C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

84 tach bars not working

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Old May 12, 2014 | 10:23 AM
  #1  
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sszracing
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Default 84 tach bars not working

I have an 84 and the digital rpm guage doesn't show anything driving.
i have 2 digital clusters and i have tried both. everything else works and when I start the car the tach rpm display works and shows all the bars good. only after the initial start up nothing in the rpm works. I saw a post that said there is a filter in the dist.? next step? I hate these digital dashs!!
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Old May 12, 2014 | 10:53 AM
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leesvet
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THAT digital dash is what made your car unique ! they are rare...and the 1st of the newest hi-tech gadgets that came from that....more accurate, more info, easier to read.
Very "state of the art" in the 80's.

If you are equipped to DIY, you can go to BATEE.COM to get the info on how-to. The clusters DO require simple maint after 25 yrs....its just more delicate than other things. READ and HEED all warnings about working on clusters!

the tach filter (condenser) is inside the dist cap . Never hurts to pull the dist and clean it all. Be sure to apply heat-grease under the ign module after cleaning. Thick wad of heat sink grease.
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Old May 12, 2014 | 11:31 AM
  #3  
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IIRC 84 to 90 are similar, this is it on a 90 vette..

[IMG][/IMG]

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Old May 12, 2014 | 11:54 AM
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sszracing
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Thanks for the reply.. I will try to clean up that area and see what happens. I know what you mean about the unique dash but.. I was unique in 84 too...then I evolved!! lol. just messing . I have 2 cluster now, but I am probably going to switch to regular guages down the road. the car is a toy for autox and hopefully road racing. It was built the month and year I graduated high school and I fell in love with the 84 when it came out. Thanks,

Originally Posted by leesvet
THAT digital dash is what made your car unique ! they are rare...and the 1st of the newest hi-tech gadgets that came from that....more accurate, more info, easier to read.
Very "state of the art" in the 80's.

If you are equipped to DIY, you can go to BATEE.COM to get the info on how-to. The clusters DO require simple maint after 25 yrs....its just more delicate than other things. READ and HEED all warnings about working on clusters!

the tach filter (condenser) is inside the dist cap . Never hurts to pull the dist and clean it all. Be sure to apply heat-grease under the ign module after cleaning. Thick wad of heat sink grease.
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Old May 13, 2014 | 02:39 PM
  #5  
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From: Monroe Twp, NJ
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Originally Posted by sszracing
Thanks for the reply.. I will try to clean up that area and see what happens. I know what you mean about the unique dash but.. I was unique in 84 too...then I evolved!! lol. just messing . I have 2 cluster now, but I am probably going to switch to regular guages down the road. the car is a toy for autox and hopefully road racing. It was built the month and year I graduated high school and I fell in love with the 84 when it came out. Thanks,
Could a dirty filter cause the numbers on the tach to be unraedable. My bar graph works but the numbers are gone.
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Old May 13, 2014 | 07:17 PM
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leesvet
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Originally Posted by ps374
Could a dirty filter cause the numbers on the tach to be unraedable. My bar graph works but the numbers are gone.
probably not. That's most likely the dirty LCD panel contacts.

if you feel comfortable messing with some fragile and expensive LCD parts...then go to bate.com and there you will get detailed instruction on "how to" fix this simple yet very common problem. The glass panels have micro-contacts that get dirty and must be cleaned. be forewarned though.....it is EASY to screw up in there and cost yourself a couple hundred to get a replacement panel....!



ask me how I know......

re: evil tabs
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