John Loper II
269ef92d51
- Document that cap/rotor were on 2002 3500, need to be installed on 2002 1500 - Provide step-by-step installation instructions - Include tools needed, parts info (GM 10452459 cap, 10452457 rotor) - Add firing order reference (1-8-7-3-6-5-4-2) - Document verification steps after installation - Once installed, proceed with Issue #1 (ECU relay test)
Project: 2002 Chevrolet Express 1500 - Crank No-Start Diagnosis
Overview
- Vehicle: 2002 Chevrolet Express 1500
- Engine: 5.0L V8 (L30 Vortec)
- Problem: Crank no-start condition - NO SPARK at all
- Status: 🔍 INVESTIGATION - Initial diagnosis
Repository
Gitea: https://gitea.loperfamily.com/Sage_Software/2002-Chevy-Express-1500
Initial Symptoms
- Engine cranks normally but will not start
- NO SPARK at any spark plugs
- Security system status: [TBD]
- Check engine light: [TBD]
Diagnostic Priority Order (GM 5.0L V8)
- Spark/Ignition System - Verify ignition coil, distributor, crankshaft position sensor
- Fuel Delivery - Check fuel pump operation, pressure, filter
- Compression - Check for mechanical issues
- Timing - Verify cam/crank timing
- ECM/Security - Check for security lockout, sensor failures
Common Causes for 2002 Express 5.0L (No Spark)
- Crankshaft position sensor (CKP) - Most common failure point for no-spark conditions
- Ignition coil - Coil pack failure
- Distributor cap/rotor - Carbon tracking, worn contacts, moisture
- Ignition control module - Inside distributor
- Security system lockout - Theft deterrent system preventing spark
- Wiring issues - Broken wires, poor connections to CKP or coil
- ECM/PCM failure - Less common but possible
Tools Needed
- OBDII scanner (GM-specific preferred)
- Spark tester
- Multimeter
- Basic hand tools
- Service manual for wiring diagrams
Next Steps
- Scan for Diagnostic Trouble Codes (DTCs)
- Check security light status
- Verify spark at coil pack
- Test crankshaft position sensor signal
- Check ignition coil power and ground
- Inspect distributor cap and rotor for damage
Session Log
- [YYYY-MM-DD HH:MM]: Project initiated, diagnosis started
Related Issues
- None yet
IMPORTANT: All diagnostic steps and actions MUST include full timestamps (YYYY-MM-DD HH:MM) for tracking progress across multiple days.