1979-1993 & 94 Conv [Subscribe to Daily Digest] |
Ryan's filter is a good approach, but you might try a couple of other things to get at the cause before you mask it with the filter.
1) Clean the battery terminals and the major grounds at the radiator crossmember and trans cover are shiny bright.
2) Check that the short alternator ground wire from the alternator to the alternator bracket. Clean and tighten. The allen screw that holds it to the bracket likes to back out.
3) Unplug antenna connectors at antenna and behind radio DIN box. Check that there is no continuity between center conductor and outside of plugs or between ground and same. If so the coax cable is shot. When you have the radio out, spray some electrical contact cleaner on the connectors between the back of the radio and the DIN box and scrape any corrosion off the connectors with a dental tool or a small screwdriver.
4) Spray some penetrant into the base of the antenna. The collar gets rusted to the antenna housing. Clean the antenna with contact cleaner(not oil, which attracts dirt).
5) Loosen antenna motor bracket screws and turn on radio to to extend antenna to make sure that the bracket is down hard against the body. then retighten the screws with the antenna up. Check the ground wire at the electic antenna and maybe add an exta ground wire here to a ground under the back seat.
6) Make sure that you have a suppressor capacitor between the primary side of the coil and ground and that the wires are not broken. This is a Saab part and mounts on the coil bolt and normally grounds to the side of the distributor. Use a non-digital ohmmeter between the connectors and you should see an initial low resistance that quickly increases up as the capacitor charges. If the capacitor is missing, you cannot connect a Radio Shack feed-through capacitor between the coil and ground or you will blow the ignition fuse. If you use one of these capacitors, you must connect the coil to one of the terminals and ground the body of the capacitor with the coil bolt, and it's a good idea to tape over the other terminal so that it is not accidentally grounded.
7)Bougicord wires with non resistor NGK plugs are best and make sure that your rotor and cap are in good shape(rotor should have about 1k ohms resistance between the center contact and the tip) El cheapo rotors will show zero resistance and make noise and cause poor performance. Resistor plugs may prematurely burnout your rotor.
8) If you check all of the above you should be in good shape. If still not satisfied add the filter to the radio power supply as Ryan suggests.
posted by 216.75....
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