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Hello Roland,
The earlier 240s have resistor ends for the spark plug wires. The later
cars use resistor plugs because the ends don't have resistors. The
resistors are used to prevent radio interference. Because they are resistors they reduce the power of the spark a little. I avoid them
because I don't want anything that will reduce the spark to my plugs. Also
the distributor rotor already has a resistor in it for this purpose so
you don't have to have the plugs or ends be resistor type. I haven't ever
had any radio interference with my setup. I use the Magnacore wires with
non resistor Beru Silverstone plugs.
The main point to keep in mind is that you don't want both. You don't want
to use resistor plugs with plug wires that also have resistor ends. The
resistor ends are identified by having a metal shield around the plug
connector and if you look at them carefully you will see written on them
the Ohms value of the resistance. Usually something like 10k ohm. The
plain rubber or silicone ends of the wires are non resistance type.
Dave 82 242ti
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