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HOMESERVICE MANUALSCHEVROLET1997CHEVY EXPRESS G3500, VAN CARGO, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 82 (ENGINE CONTROLS - BASIC DIAGNOSTIC PROCEDURES - 4.3L)NO START DIAGNOSISNO START - ENGINE CRANKS OKAYIGNITION SYSTEM
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 F

Ignition System

1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 FSECTION Ignition System
WARNING: This page is about a different car, the 1998 GMC Savana, 1998 Chevrolet Chevy Van, and 1998 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic (OBD) System Check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in TESTS W/CODES - 4.3L article. After performing OBD system check, go to next step.
  2. Install scan tool. Using scan tool, monitor Throttle Position (TP) sensor. Ensure is throttle closed. If TP sensor value is greater than 2.5 volts, diagnose using DTC P0123. See TESTS W/CODES - 4.3L article. If TP sensor voltage is less than 2.5 volts, go to next step.
  3. Using scan tool, monitor Engine Coolant Temperature (ECT) sensor. If ECT sensor value is less than -22°F (-30°C), diagnose using DTC P0118. See TESTS W/CODES - 4.3L article. If ECT sensor is greater than -22°F (-30°C), go to next step.
  4. Turn ignition off for 10 seconds. Turn ignition on. Fuel pump should operate for about 2 seconds. If fuel pump operates as specified, go to next step. If fuel pump does not operate as specified, go to FUEL SYSTEM ELECTRICAL CIRCUIT.
  5. Turn ignition off. Disconnect injector harness connector at intake manifold. Using a test light connected to ground, probe injector feed circuit. See WIRING DIAGRAMS - 4.3L article. Turn ignition on with engine off. If test light illuminates, go to next step. If test light does not illuminate, go to step 8).
  6. Disconnect one spark plug wire. Install Spark Tester (J-26792). Crank engine. If spark is present, go to next step. If spark is not present, see BASIC IGNITION SYSTEM CHECKS  .
  7. Reconnect spark plug wire. Turn ignition off. Connect fuel pressure gauge. Turn ignition on with engine off. Observe fuel pressure. Fuel pressure should be 55-61 psi (3.9-4.3 kg/cm2 ). If fuel pressure is as specified, perform fuel injector balance test. See INJECTOR BALANCE TEST under FUEL SYSTEM in SYSTEM/COMPONENT TESTS - 4.3L article. If fuel pressure is not as specified, diagnose fuel system. See BASIC FUEL SYSTEM CHECKS  .
  8. Repair injector ignition feed circuit. After repairs, go to next step.
  9. Using scan tool, select DTC, CLEAR INFO function. Attempt to start engine. If engine starts and continues to run, go to next step. If engine does not start, or starts and dies, go to step 2).
  10. Warm engine to normal operating temperature. Using scan tool, select DTC, FAILED THIS IGN function. If DTC(s) is present, diagnose DTC(s). See TESTS W/CODES - 4.3L article. If DTC(s) is not present, go to next step.
  11. Select CAPTURE INFO, REVIEW INFO function. If additional DTC(s) is present, diagnose DTC(s). See TESTS W/CODES - 4.3L article. If DTC(s) is not present, system is okay.
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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.