GM Firebird 1967-1981 Repair Guide



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 Firebird's engine running smoothly and will prevent the annoying breakdowns and poor performance associated with an untuned engine.

All Firebirds used a conventional breaker point ignition system through 1974. In 1975, Pontiac switched to a fully electronic ignition system known as the High Energy Ignition (HEI) System.

A complete tune-up should be performed at least every 15,000 miles (12,000 miles for early models) or twelve months, whichever occurs first.

1981 models have increased their tune-up 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 Repair Guide 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 cumulative 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.

See Figure 1

Click image to see an enlarged view

Fig. Fig. 1: The VECI label exhibits important tune-up information, such as idle speed and ignition timing