Odd tachometer behavior

[itsbrokeagain]

Ive started to have this issue myself. Last time I pulled the cluster out, half the solder joints were all cracked, so I fixed all that, fixed my bouncy temp and fuel gauge, and everything was set. I noticed that the SI board batteries had leaked onto the board, which I tried to clean up, but I dont think it helped.


The SI board will not reset now (when I first got it, it did), and slowly, things started to fail. The coolant light on the OBC stays on (it used to come on from time to time, an indication that the SI board was starting to fail), sometimes the washerfluid light comes on, then my MPG needle went from half working, to not working at all, and now the tach, after driving for a long period of time will just drop dead.

I really hate SI boards..Ive been trying to find a good one for some time, and Ive had no luck at the yards.

[sheefo2k]

tell me about it. check my other thread. I have pics

[franko2490]

bumping an ooold thread but I started having this problem also . I am not sure on the SI batteries because mine does it from time to time . Couldn't that be from a dirty electric ground ???

[dvck]

Just got my e30 a 91 325i and first the "break lining" light went on, drive after that the rpms died, my fogs wont go on and my radio and obc are nowhere to be seen,
anyone have any answers on this?

[slap2nd]

my fuel gauge only work "half way" I fill the tank up.. it shows full, then when I drive the car for a week it goes down to half way and stops.. so then I have no idea when im going near empty until the light goes on. It always looks like the car has half a tank of fuel all the time?