In order to extract the full measure of performance and economy from your engine it is essential that it is properly tuned at regular intervals. A regular tune-up will keep your cars engine running smoothly and well prevent the annoying breakdowns and poor performance associated with an untuned engine.
A complete tune-up should be performed at least every 15,000 miles (12,000 miles for early cars) or twelve months, whichever comes first.
1981-88 cars have increased their interval to 30,000 miles.
This interval should be halved if the car is operated under severe conditions such as trailer towing, prolonged idling, start-and-stop driving, or if starting or running problems are noticed. It is assumed that the routine maintenance described in has been kept up, as this will have a decided effect on the results of a tune-up. All of the applicable steps of a tune-up should be followed in order, as the result is a cummulative one.
If the specifications on the underhood tune-up sticker in the engine compartment of your car disagree with the Tune-Up Specifications chart in this section, the figures on the sticker must be used. The sticker often reflects changes made during the production run.