brid

well i disconnected my battery put it back on then took the car for a drive. now the speedometer reading is not keeping up with the acceleration and deceleration of the car. any suggestions? thanks, Brian.

Lunacy

How bad is your speedometer lag?
I find my speedometer reading lags for a fraction of a second and thought it was normal.

brid

my lag is pretty bad. ill stop and it will still read at either 4-5mph then gradually go down to 0. anybody have a solution?

xviper

This depends on how fast you stop. All digital speedos have a lag. Do you actually notice a distinct difference from before you disconnected the battery or did you not perhaps make note of it?

brid

no its bad. i know digital speedometer's have little lag but mine its pretty bad. like instead of slowing down and having the speedometer read 10 9 8....its stuck at liek 18 17 16 15....

xviper

OK, I'll take your word for it. You might have gotten some crud into the wiring harness for the speedo sensor on the side of the tranny. You might go under there and disconnect it, clean it out with WD-40, dry it all with compressed air, reconnect it and see if it makes any difference. Check to make sure that none of the wires going into the harness has been damaged. Then reset the ECU by pulling the "BACK UP" fuse under the dash for a minute or so just for good measure. If this doesn't fix it, then you may have a bad speed sensor or instrument cluster as the odometer and speed signals are stored there. Could also be the ECU, too. These would have to be diagnosed by a service tech.