GM Prizm/Nova 1985-1993 Repair Guide



See Figure 1

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Fig. Fig. 1: Gasoline Engine Tune-Up Specifications

Neither tune-up nor troubleshooting can be considered independently since each has direct bearing on the other.

The procedures contained in this section are specific procedures applicable to your Nova or Prizm.

An engine tune-up is a service designed to restore the maximum power, performance, economy and reliability in an engine, and at the same time, assure the owner of a complete check and lasting results in efficiency and trouble-free performance. Engine tune-up becomes increasingly important each year, to ensure that pollutant levels are in compliance with federal emissions standards.

It is advisable to follow definite and thorough tune-up procedures. Tune-up consists of three separate steps:

  1. Analysis, the process of determining whether normal wear is responsible for performance loss, and whether parts require replacement or service
  3. Parts Replacement or Service
  5. Adjustment, where engine adjustments are returned to the original factory specifications after the installation and/or servicing of parts.

The extent of an engine tune-up is usually determined by the mileage or length of time since the previous service, although the type of driving and the general mechanical condition of the engine must be considered. Specific maintenance should also be performed at regular intervals, depending on operating conditions.

The first job is to locate the problem and cause. Once the problem has been isolated, refer to the appropriate section for repair, removal or adjustment procedures.

It is advisable to read the entire section before beginning a tune-up, although those who are more familiar with tune-up procedures may wish to go directly to the instructions.