Tach ???
Thread Starter
Burning Brakes
Joined: Oct 2003
Posts: 1,097
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From: Olive Branch MS
St. Jude Contributor
Tach ???
If my Tach (that has been working) now stays pegged all the way up, is it shorted to ground or is the wire broke going to it. I know my temp sensor did this when it became detached, but I don't remember which way. Thanks 
Drifting
Joined: Jul 2003
Posts: 1,253
Likes: 1
From: East China MI
Re: Tach ??? (brooksman9)
It must be National Tach Problem Month. I just ran a couple of posts on tach problems and this is what I learned; it is most likely the tach filter. Check out this link http://forums.corvetteforum.com/zerothread?&id=849227&postid=1547657090# 1547657090
Drifting
Joined: Nov 2003
Posts: 1,634
Likes: 4
From: Northern NJ
St. Jude Donor '04 & '05
Re: Tach ??? (zwede)
If it is pegged all the way up I would think it is the tach itself that is busted.
When the tach filter goes bad, it's usually in a "open" condition. If this were the case (and assuming the tach itself is OK) then most likely it would just be at zero.
However that said these electronic tachs do have a habit of staying at the last rpm they were at when the power is removed. So assuming the tach was "spiked" just before the signal disappeared, then I suppose it's possible that the filter is open and the tach could be OK.
I suppose the only way to find out is to test further.
Good Luck!
Thread Starter
Burning Brakes
Joined: Oct 2003
Posts: 1,097
Likes: 0
From: Olive Branch MS
St. Jude Contributor
Re: Tach ??? (ACECO)
Well, went out to start the car today and before I even tried I noticed the tach was back at zero. Cranked it up and it worked just fine. Guess I'll have to save this project for another day. 
Drifting
Joined: Nov 2003
Posts: 1,634
Likes: 4
From: Northern NJ
St. Jude Donor '04 & '05
Re: Tach ??? (brooksman9)
Well, went out to start the car today and before I even tried I noticed the tach was back at zero. Cranked it up and it worked just fine. Guess I'll have to save this project for another day.
FWIW. Good Luck!
