3.7L & 5.2L EFC System: Testing: Notes

A malfunction in the EFC system may result in engine surge, hesitation, rough idle and/or poor fuel economy. Before performing 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, proceed with testing.

NOTE: The Spark Control Computer controls ignition timing as well as air/fuel mixture. Before testing EFC system, perform Electronic Spark Control Tests first. Also, do not remove grease from either harness connectors or connector cavities in computer.The grease is used in order to PREVENT MOISTURE from corroding the terminals. If there is not at least 1/2" of grease on bottom of computer connector cavities, apply a liberal amount of Mopar multipurpose grease No. 2932524 (or equivalent) over entire end of plug before reinstalling.