Diagnosis & Testing: Notes

A malfunction in the EFC system may result in engine surge, hesitation, rough idle and/or poor fuel economy. Before making any tests, check all vacuum and electrical wiring for proper routing and connections, and check for exhaust and intake manifold leaks. If these are in order, testing may begin.

The Spark Control Computer controls ignition timing and air/fuel mixture (with feedback system). When system testing is required, always perform ELECTRONIC SPARK CONTROL TESTS first, before testing EFC system, or using the On-Board Diagnostic system.

When testing requires that either harness connector be disconnected from the computer, DO NOT  remove grease from either connector or cavities in computer. The grease is used in order to prevent moisture from corroding the terminals. If there is not at least 1/8" of grease on bottom of computer connector cavities, apply a liberal amount of Mopar Multipurpose Grease (Part No. 2932524 ) over entire end of plug before reinstalling.