I was driving my car yesterday and the speedo went crazy. First it didn't work and then it started to work but was about about 25 mph off. From a dead stop stop the speedo kicks in after about a minute and a half. I will be doing about 30 mph and it starts to work and starts from zero so it is really off. It seems to have a mind of it's own. I just bought the car about a week ago.
It is a 92 RS 305TBI and a 5 speed. Also it is all original.
Please Help
Jody


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1992 25Th Anniversary Camaro
305 TBI
5 Speed

 

ahh, never mind, out of my league

 

You have an electric speedo, so it could be a wiring problem, or a bad VSS(vehicle speed sensor).

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1989 Pontiac Firebird Formula LO3 Auto
-180 degree stat
-Hooker Cat-Back
*****Possible summer '01 mods*****
Open Element, Auburn Posi, Keyless Entry, wonder Bar off the IROC, 4th gen seats, T/A tail lights

1985 Camaro IROC-Z LB9 Auto
http://www.geocities.com/krt80/

 

This is happening to my Trans Am. I found the cheapest way to get by this is to keep pace with traffic, but if you're all alone and go by a cop, pray...Or duck onto a side road

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--Steve S--
1984 Trans Am 305 LG4, 5 speed
RPO codes point to Recaro version
Daily Driver, Flowmaster 80 Series

[This message has been edited by 84TransAm (edited January 27, 2001).]

 

Well, if a cable driven speedo can do it too, then could it be the speedo gears in the tranny messed up?

 

It could be because either the VSS sender which is in the tranny is bad or the driven or drive gears are stripped or slipping off...

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92 Z28 L98 350
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Ported stock heads, XR270HR-10 cam, TES headers, Crane AFPR, Flowmaster catback, MSD ignition components, #24 SVO injectors.
Best ET 13.3@107 mph
"Take that auto, drop it in first, hold the brakes, stomp the gas and grin from ear to ear! :-)
Click here to see my car at Truspeed.org

Check out TruSpeed at http://www.truspeed.org
Check out the Bin Archive at http://www.truspeed.org/bins.html

 

Nah, my cables just binding

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--Steve S--
1984 Trans Am 305 LG4, 5 speed
RPO codes point to Recaro version
Daily Driver, Flowmaster 80 Series

 

I meant that jody's could have stripped gears in the tranny. Since a cable driven speedo can have the same trouble, that is about the only thing they share in common.

 

Entirely possibly. The T5 electronic sender bolts in place in the same spot and even uses a plastic gear, which could strip. A few teeth missing would cause that kind of behavior.