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

FAST TACH

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Old Oct 11, 2001 | 01:15 PM
  #1  
TOEMAN's Avatar
TOEMAN
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From: SLIDELL, LA.
Default FAST TACH

have a 91 roadster, put a scanner on line and found that the tach is showing twice what the scanner shows. changed the dist. module but no difference.

trying to find out if anyone knows what possibly could be the trouble.

put this out on the forum a month ago, but no response, hope somebody can help.

thanks

TOEMAN
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Old Oct 11, 2001 | 07:18 PM
  #2  
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88L98
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From: Big D Tx
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Default Re: FAST TACH (TOEMAN)

kinda strange, maybe your tach is bad, or there is a problem with your tach filter. do you have a stock ignition system?
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Old Oct 11, 2001 | 10:11 PM
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6 speed Sid
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From: New Bern NC
Default Re: FAST TACH (TOEMAN)

Is the scanner reading right? You should be able to which is right at idle, since there is a noticeable difference between 700 and 1400 rpm. I have never had a tach that read that far off, but I guess there is always a first. I would hook up an aftermarket tach and if it reads right, then your tach is bad.
Sid.
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Old Oct 12, 2001 | 03:35 PM
  #4  
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lcvette
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From: Wilmington NC
Default Re: FAST TACH (6 speed Sid)

6 speed sid, you need to come join us at the track in jacksonville this thursday, its a ton of fun! send me an email if your interested.

as for the tach issue, i agree borrow a cheap tach, hook it up and see if it works in conjunction to your dash mount. if yes then something is very screwy. but most likely the calibration is off, im not sure how to adhust it but im going to learn! if you don't have it fixed by the time i figure out how to do it, i will drop you a line, in the measn time best of luck!

chris :cheers:
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Old Oct 12, 2001 | 05:16 PM
  #5  
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TOEMAN
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From: SLIDELL, LA.
Default Re: FAST TACH (TOEMAN)

thanks for the come backs. i think i will buy a cheap tach and try it. i'm sure the scanner is right, you can tell the difference from 700-1400 rpm. and it sounds like the engine is turning 700 and not 1400. just needed to find out if anything could cause this before i buy another tach and find the same thing.

thanks again

toeman
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