Engine Controls - Basic Testing: Introduction
NOTE:
Shadow and Sundance Convertible models with 2.5L TBI engine are manufactured with either early or late design fuel, ignition and emission systems. Late design vehicles use an epoxy ignition, mounted on thermostat housing, and a high-pressure fuel system requiring quick-connect fuel fittings. Early design vehicles use an oil-filled ignition coil, mounted on right inner fender, and a low-pressure fuel system using hoses and clamps.
The following diagnostic steps help prevent overlooking a simple problem. This is also where to begin diagnosis for a no-start condition.
The first step in diagnosing any driveability problem is verifying the customer's complaint with a test drive under the conditions the problem reportedly occurred.
Before entering self-diagnostics, perform a careful and complete visual inspection. Most engine control problems result from mechanical breakdowns, poor electrical connections or damaged/misrouted vacuum hoses. Before condemning the computerized system, perform each test listed in this article.