Speedometer problems
Thread Starter
Teching In
Joined: Jun 2018
Posts: 6
Likes: 0
From: Kentucky
Speedometer problems With recently getting a 98 trans am, the speedometer tries to work, going 5-10mph it works perfect. But after that it will climb at a rapid rate, going 20mph but the car would read 50mph. 30=80, anything after about 32mph and it’s stuck at 150. Replaced the speed sensor on the 4l60e. Still the same thing. I’m wondering if the cluster is broken. Any ideas?
TECH Junkie
Joined: Dec 2012
Posts: 3,614
Likes: 1,326
From: Iowa
Possible
Easy check is to scan the live data and see if the scanned speed matches what the cluster is trying to show or not.
If the live data shows 150...then there are a bunch of causes...wildly different rear gear/tire size (i mean DRASTIC)...or a tune that has the improper tire ratio in it
If the live data shows actual road speed but the cluster shows 150...then it might be the cluster
Easy check is to scan the live data and see if the scanned speed matches what the cluster is trying to show or not.
If the live data shows 150...then there are a bunch of causes...wildly different rear gear/tire size (i mean DRASTIC)...or a tune that has the improper tire ratio in it
If the live data shows actual road speed but the cluster shows 150...then it might be the cluster
