Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1997CHEVY EXPRESS G3500, VAN CARGO, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 13 (ENGINE CONTROLS - BASIC DIAGNOSTIC PROCEDURES - 5.7L (G SERIES))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 variant/trim than selected.
- Perform On-Board Diagnostic (OBD) System Check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . After performing OBD system check, go to next step.
- Install Tech 1 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 the TESTS W/CODES article. If TP sensor voltage is less than 2.5 volts, go to next step.
- Using scan tool, monitor Engine Coolant Temperature (ECT) sensor. If ECT sensor value is less than -30°C, diagnose using DTC P0118. See the TESTS W/CODES article. If ECT sensor is greater than -30°C, go to next step.
- 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.
- Turn ignition off. Disconnect injector harness connector at intake manifold. Using a test light connected to ground, probe injector feed circuit. See the WIRING DIAGRAMS article. Turn ignition on with engine off. If test light flashes, go to next step. If test light does not flash, go to step 8).
- 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, diagnose enhanced ignition system.
- 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 the SYSTEM/COMPONENT TESTS article. If fuel pressure is not as specified, diagnose fuel system. See BASIC FUEL SYSTEM CHECKS .
- Repair injector ignition feed circuit. After repairs, go to next step.
- 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).
- Warm engine to normal operating temperature. Using scan tool, select DTC, FAILED THIS IGN function. If DTC(s) are displayed, diagnose DTC(s). See the TESTS W/CODES article. If DTC(s) are not present, go to next step.
- Select CAPTURE INFO, REVIEW INFO function. If additional DTC(s) are displayed, diagnose DTC(s). See the TESTS W/CODES article. If DTC(s) are 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.