Hi Guys
After a bit of advice, for some random reason my speedo stops working. Its not been working for weeks, then it will work for a few hours then stop again. Also when this happens, the petrol gage seems to be very inaccurate (it will move the fuel level up and down if I go around corners or down a hill), but when the speedo works the gague is perfect. The entire time the rev counter is fine?
Any ideas, I dont even know where to start!
Might be an idea to compare notes with Jason. See this thread l viewtopic.php?f=11&t=29259 (http://www.mr2roc.org/phpBB3/viewtopic.php?f=11&t=29259) l
He experienced something similar with his speedo a few days back.
Haven't sorted my issue yet. Going to get it looked at in the next couple of weeks!
By no means an expert on this but normally if an instrument malfunctions it is either the sensor to it or the receiver of the signal. The fact that you have a problem with two instruments probably means that it is not a sensor issue (I can't see how the speedo sensor can link to the fuel guage). What they have in common is the requirement for an earth so that may be the issue. (I've got a really annoying rh indicator problem which is essentially just a bad earth and had a similar thing with towing electrics on the Saab). The earth to the instrument panel can't really be the issue if the rev counter works normally. Don't know whether or not they share a common fuse which is giving intermitant contact.
Yea I was thinking earth or sensor but figured that because the rev count worked fine it wouldnt be that? I might take a look at the earth anyway, and maybe replace the fuse?
Actually i forgot to mention that randomly (but not linked to the speedo) i've had a few times where its dropped to 3 cylinders, but i figured that was more down to a faulty plug/coil which I was going to replace
Actually just been caught out on my lawnmower when I thought it was the coil, not the plug. You can switch the plugs to check I think.
It's hard to tell from the wiring diagrams what they all do, but there are one brown and three white/black earth wires to the instrument assembly, definitely worth checking them. There are also 4 fuses - ECU-B, GAUGE, RADIO 2 and I/UP, although I would have thought that only the first two would have any effect on your problem