M42club.com - Home of the BMW E30/E36 318i/iS

DISCUSSION => Electrical => Topic started by: AlpineRob on March 19, 2008, 10:10:05 AM

Title: Speedometer pulsing up and down while driving!??
Post by: AlpineRob on March 19, 2008, 10:10:05 AM

driving down the road normally, sometimes the speedometer will lay flat not working..then when on the highway - it may work but as soon as i give the car more throttle..its dies..then i let off the gas...it bounces back up..?? I rarely drive it, but it was fine before driving through the rain for a couple hours the other day.. any suggestions on what it is..? could the speedometer impulse sensor need to be replaced? Hope it doesn't have anything to do with the cluster..thanks a lot everyone

   -Robert

Title: Speedometer pulsing up and down while driving!??
Post by: Artem on March 30, 2008, 07:18:39 PM

Replace the speedo or the cluster - either one will work. Everyone who had the same problem will end up doing so, and there is no simple fix - i have 3 clusters for that same reason lying around.

Title: Speedometer pulsing up and down while driving!??
Post by: r0ckrat on April 03, 2008, 01:43:25 PM

Check the wires at the diff where the speed sensor is. One (or both) of the wires to the connector are worn, and as soon as you touch one it will break. There is a repair kit for it, but I don't know the part number. It was installed by a local mechanic for me when I was getting a track inspection.

What's happening is that when you accelerate or decelerate the diff is twisting a little, and wiggling the nearly-broken wire.

Title: Speedometer pulsing up and down while driving!??
Post by: txleadfoot on April 03, 2008, 02:08:14 PM

Kit?  I need one.  Anyone have a part number?