If all of your gauges malfunctioned this way, I'd have to guess possibly a bad ground in the dash. I would look for a loose or corroded screw passing through something that resembles a circuit board printed onto a piece of flexible plastic sheet. Good luck.
SOURCE: rough idle on 1990 saab 900 convertible, 16V
Because the car has adaptive technology, it may take a while to reset and adjust to the new, cleaner and better conditions than those to which it had previously adapted.
Did you change the cap and rotor? if the plugs needed replacement, likely they do too
Possible other causes include:
loose or corroded connections to any electrical component you disturbed (make a checklist and tick them all off as you check them);
mis-reinstallation of any F.I. part disturbed(checklist again)
obstructed water flow through the AIC valve;
improper voltage output from the AIC valve (for LH 2.4 systems, should output 8 volt at idle, dropping as load increases; for LH 2.4.2 system output 7 volt at idle etc; testing between terminals)33 and 17 at disconnected LH connector;
possible problem with MAF.
Hope this helps
Saabreur
SOURCE: 1997 SAAB 900s speedometer and tachometer not working
Remove the instrument panel form the dash. Pull the back off and resolder resistor R13 on the back circuit board. This is a fairly delicate job and requires a fine pointed soldering iron. This fixed the Tach, Odometer readout, and fuel guage but not the speedometer in my 85 900 s.
Any ideas on the speedometer?
SOURCE: Mercedes C180 Speedometer some time works sometime does not work
I have similar problem with the same type of car. It's not only the speedometer, it is also the fuel meter. But after driving some minutes, they will be back in business.
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