GM Caprice 1990-1993 Repair Guide



See Figures 1 and 2

Click image to see an enlarged view


Click image to see an enlarged view

Fig. Fig. 2: Example of emission decal located in engine compartment

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

A complete tune-up should be performed every 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 Routine Maintenance 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.

All 1990-93 Caprices use electronic ignition.