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HOMESERVICE MANUALSGMC1992VALUE VAN 4.3 Z, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)EXTERNAL PAGESDIFFERENT CARSECTION 48 (ENGINE CONTROLS - BASIC TESTING - 3.0L)INTRODUCTION
1992 GMC Value Van 4.3 Z, Automatic

Section 48 (Engine Controls - Basic Testing - 3.0L): Introduction

1992 GMC Value Van 4.3 Z, AutomaticSECTION Introduction
WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION section before disconnecting battery.

Following diagnostic steps can help prevent overlooking a simple problem. Also use this article to begin diagnosis for a no-start condition. First step in diagnosing any driveability problem is verifying customer's complaint with a test drive under conditions during which problem reportedly occurs.

Before entering self-diagnostics, perform a careful and complete visual inspection. Most driveability or no-start problems are not related to computerized engine control systems, but are in fact simple mechanical, electrical, fuel or vacuum related faults. Most engine control problems are results of mechanical breakdowns, poor electrical connections, or damaged or misrouted vacuum hoses. Before condemning computerized engine control system, perform each test listed in this article.

NOTE: All voltage tests should be performed with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in testing procedures.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.