Question about 1991 Volvo 740
I don't know what is causing this problem, but I know phil140701's answer is completely wrong on two counts. First, 740 Volvos starting at least in 1986 have electronic speedometers and no cable. There is an electronic sensor on the differential which sends a signal to the speedometer cluster. Second, if it were strictly mechanical with a cable then the voltage regulator could have no effect on it at all.
Posted on Sep 01, 2009
If i remember right from prior experience with volvos you'll have a speedometer cable on that model, the cable is made from wire which is square shaped on both ends and then a blob of solder is added to make them stronger(so they stay square), you will probably find that one of these soldered ends has broken of and that the cable is no longer gripping the square shape hole as it should at speed, best bet is a replacement cable if the solders broke off, if it's not this it could be either a faulty dial or the voltage regulator on the back of the instrement clusters wareing out
Posted on Jan 08, 2009
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Posted on Jan 02, 2017
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