Dodge Omni/Horizon/Rampage 1978-1989 Repair Guide

Tune-up Procedures


An engine tune-up is a service designed to restore the maximum capability of power, performance, economy and reliability in an engine, and, at the same time, assure the owner of a complete check and more 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 a definite and thorough tune-up procedure. Tune-up consists of three separate steps: Analysis, the process of determining whether normal wear is responsible for performance loss, and whether parts require replacement or service; Parts Replacement or Service; and Adjustment, where engine adjustments are returned to the original factory specifications.

The extent of an engine tune-up is usually determined by the 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.

Troubleshooting is a logical sequence of procedures designed to lead the owner or service man to the particular cause of trouble. The troubleshooting section of this guide is general in nature, yet specific enough to locate the problem. Service usually comprises two areas; diagnosis and repair. While the apparent cause of trouble, in many cases, is worn or damaged parts, performance problems are less obvious. 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.