The tune-up is a routine maintenance operation which incorporates a series of specific procedures essential for the efficient and economical operation-as well as the long life-of your car's engine. The interval between tune-ups is a variable factor which depends upon the way in which you drive your car, the conditions under which you drive it (weather, road type, etc.), and the type of engine with which your car is equipped. It is generally correct to say that no engine should be driven more than 12,000 miles between tune-ups. In the case of cars which have been driven extremely hard, or under severe weather conditions, the tune-ups should be performed at closer intervals. Needless to say, high-performance engines require more frequent tuning than other engines, regardless of weather or road conditions.
The replaceable parts involved in a tune-up are: spark plugs, breaker points, condenser, distributor cap, rotor, spark plug wires, and the ignition coil high-tension wire. In addition to these parts and adjustments involved in installing them, there are several adjustments of other parts involved in completing the job. These include carburetor idle speed and fuel/air mixture, valve lash, ignition timing, and dwell angle.