Author Topic: speedo quit! (Read 3729 times)

3seriesNut · « **on:** May 06, 2009, 03:41:07 PM »

my speedo started going nuts a few days ago. when i would down shift it would bounce of 0 then back to speed. then today its not working at all.

is there a speed sensor in the rear or is the guage shot? if it is shot would the speedo from a 325 work? it looks like its a motherfucker getting to the gauges tho

ak96ss · « **Reply #1 on:** May 06, 2009, 04:18:13 PM »

Speed sensor is mounted through the rear differential cover - the wires have a habit of breaking back there. I'd look at that first.

3seriesNut · « **Reply #2 on:** May 06, 2009, 04:44:02 PM »

thanks john. after looking at the scematics i found the speed sensor. its raining again today so im not messing with it. my GPS has a fairy accurate speedo in it.

1991 E30 M42 · « **Reply #3 on:** May 07, 2009, 02:52:55 AM »

did you try smacking your dash just above the cluster, it works every time for my coolant temp sensor

3seriesNut · « **Reply #4 on:** May 07, 2009, 05:07:47 AM »

does nothing. im thinking its the speed sensor wiring.