1998 E39 no speedometer, gas guage not reading correct and..

<jamcashebay00.TakeThisOut@gmail.com> wrote:
>1998 e39 bmw 528i sedan. The speedometer DO NOT read at all. The gas
>gauge is not reading correct, it would read 3/4 tank but you would run
>out of gas. And read empty when tank is full.... it does what it
>wants to do. The temperature gauge is never centered.. the needle
>only gets to about 10 o'clock position on the gauge.

Something is wrong either with the instrument cluster, the ground for
the instrument cluster, or the power to the instrument cluster. Make
sure the fuse for the instruments is clean and secure first. Then pull
the cluster and clean ALL the contacts on everything with DeOxit or
Cramolin. Check the ground connections to the chassis and make sure
they are all clean and solid.

A lot of the older clusters had problems with NiCd batteries inside that
failed, and with cold solder joints. By 1998 you shouldn't be seeing
those problems, although you might be seeing problems from the cheaper
electrolytic capacitors that BMW started using. Most of the problems
with the cluster, though, turn out to be corroded contacts somewhere.

You can probably get a replacement cluster from a junkyard at a reasonable
price if you can't find the problem.

>The window and
>sunroof works when the want also. they mainly wrk when the key is use
>to lock or unlock the car instead of the remote. There are no check
>engine lights on the dash.

Get the wiring diagram and see what they have in common. Odds are
there is one relay controling both of them, possibly related to the
locking system, and that's where to start looking. Get out a test lamp
and start checking the power at each step along the way, working from
the button panel for the sunroof and working back to the battery, using
the diagram in the manual.

> I dont want to go change a bunch of things when it may be a computer
>problem or one of the BMW chronic problem you only here about when it
>happens to you. I know it could be the fuel sending unit, speed
>sensor, but it could also be the unit the collects this data before
>sending it to the cluster that is bad..

This is at least two different things. But I believe on your car,
everything related to your first set of problems is happening inside
the cluster. This is why bad connections at the cluster or bad
power or ground for the cluster can cause a whole variety of issues.
--scott


--
"C'est un Nagra. C'est suisse, et tres, tres precis."
 >> Stay informed about: 1998 E39 no speedometer, gas guage not reading correct and.. 

jamcashebay00.TakeThisOut@gmail.com wrote:
> 1998 e39 bmw 528i sedan. The speedometer DO NOT read at all. The gas
> gauge is not reading correct, it would read 3/4 tank but you would run
> out of gas. And read empty when tank is full.... it does what it
> wants to do. The temperature gauge is never centered.. the needle
> only gets to about 10 o'clock position on the gauge. The window and
> sunroof works when the want also. they mainly wrk when the key is use
> to lock or unlock the car instead of the remote. There are no check
> engine lights on the dash.
>
> I dont want to go change a bunch of things when it may be a computer
> problem or one of the BMW chronic problem you only here about when it
> happens to you. I know it could be the fuel sending unit, speed
> sensor, but it could also be the unit the collects this data before
> sending it to the cluster that is bad..
>
> Any advise on what to checkout would be helpful


I had similar problems with an e30 speedometer and gas gauge.
I replaced some blown fuses,then they worked, make sure
your fuses are good.
 >> Stay informed about: 1998 E39 no speedometer, gas guage not reading correct and..