cwiert

1988 928 S4.

Hi,
I have a problem where the fuel gauge works every now and again. I can get it to work for a few seconds if I tap the pod or instrument cluster hard enough. So that tells me it's a bad connection somewhere on the gauge side... not the sender.
Tomorrow, my plan is to remove the pod and cluster and clean the 4 connectors and any ground points i can see back there. Aside from doing that, is there anything else I should do while I'm in there with regards to the fuel gauge not working?
Thanks for any insight.
-John

Ducman82

clean the connections, then see what happens. also check the connector on the "driver side" or right if you looking from the back of the cluster. some times that gets a little loose.

Lizard928

On the back of the instrument cluster, and the back of that gauge there is a 8mm nut holding down a plastic piece. Remove this and clean all connections around it.
As well clean the 3 spots the connectors attach to the cluster with a pink eraser found on the end of a pencil.

Jascd

check the plug on the circuit board that connects the boards when they swing open. The plug gets some lateral tension on it via opening and closing and the feet of the plug are soldered on to the board rather than through it. On My s4 I had the same symptoms for oil pressure, temp etc and I traced it to cracked joints on the feet of that plug. I reflowed the solder and its been fine since, but took a heap of finding.

cwiert

Thanks for the advice, everyone. I'm going to get started on this in a couple hours. Anything else I should look at/clean while I'm in there?