A part of every major tune-up is to replace the distributor cap. If your cap shows signs of wear such as cracks or carbon trails, it's a good idea to replace it. Also, be sure to replace the ignition rotor at the same time.
12-11-1-363-423-M14
Distributor Cap, 320i (1976-08/79), Each Brand: Bosch [More Info]
$8.00
12-11-1-706-122-M18
Distributor Cap, 320i/is (9/79-83), Each Brand: Bremi [More Info]
