Having problems with your 1999 Oldsmobile Silhouette ?

1998 Olds Silhouette Auto Trans & Speedometer Problem

\015 Here is the deal: going down hill in overdrive or 3rd, when you let off the gas pedal or touch the brakes, the RPM will stay steady but the speedometer needle will zero out then climb to speed your actually traveling and then fall to zero and repeat until the car \302\240decides to get its act together. I pump the gas a little and it helps, but I don't notice it changing the RPM until the "catch on feeling" and were going again. For a while, it would not do this on any regular basis, now it's doing this often. The engine \302\240will sometimes die going down hill, around a tight curve ( anywhere you need to suddenly back off the gas or tap the brakes) or if you have to stop short. Now, for the first time it acted as if it would not shift down when I came to a stop, starting off as if it was in high gear. Most of the time on flat ground it shifts hard and no slippage even when I stand on it. The "tranny" fluid is Amsoil and full and the filter is new. THANKS A HEAP - Ol' Tom\015 Posted / edited by AnonymousUser on : 26-07-2021

Answers :

Hi and welcome to FixYa,

Initially, check the wiring/connectors to the speed sensor. The speed sensor is at the transmission would look like the image below.
f19e2c8.jpg
Incidentally, the speed sensor not only sends signal to the speedometer, is signals are also used by the engine computer and the transmission control. This would partly explain all the other concerns.

Check and perform preliminary visual or necessary inspection. Pls post back result(s). Good luck and Thank you for using FixYa.
Speedometer started going crazy then stoped working altogether
\015\012I changed the speed sensor but no change. Auto zone sold me a cable only problem I can't find out where it goes I've looked all over
\015\012the place! does this mini van 1997 Olds silhouette even use a cable ? or do I hafto buy
\015\012the whole speedometer assembly ?
\015\012 Another question the shifter indicater no longer shows what gear I'm in anymore is that electronic or machanicle ?
Repair Help & Product Troubleshooting for 1999 Oldsmobile Silhouette

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