I have a code on my 94 D90, #21 (Fuel Tune Select). Has anyone ever seen that code be displayed before? I did unplug my two silver relays (fuel/ecu) when I serviced my fuel pump recently as I am still troubleshooting my intermittent bucking/misfiring (driving me nuts).
My first thought when I saw this code was it was due to pulling the relays. So I cleared the code and pulled them again, but this code did not come on yet. I will drive around tomorrow and see if it will come back, but what could it possibly be?
The definition is: Identifies that the tune select resistor is open circuit- refer to tune select resistor test. The tune resistor is embedded in the wire harness. This code may indicate damage to the wire harness.
But all my research on the NAS 90's is that there is NO tune resistor (particularly from this article and others research http://www.britishv8.org/articles/rover-14cux-efi.htm
Anyone see this code before? I hope my harness is not damaged--as it is intermittent, this will be a bugger to find, to say the least...