Possible Causes & Corrections
WARNING: This page is about a different car, the 2003 GMC Savana and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
Check for the following items:
- Check fuel pressure. See FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 4.3L CHEVY EXPRESS & SAVANA article.
- Inspect Throttle Position (TP) sensor for binding or sticking. Voltage should increase at a steady rate as the throttle moves toward Wide Open Throttle (WOT) position.
- Inspect Manifold Absolute Pressure (MAP) sensor response and accuracy. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 4.3L CHEVY EXPRESS & SAVANA article.
- Test canister purge system for proper operation. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 4.3L CHEVY EXPRESS & SAVANA article.
- Perform fuel injector coil test. See FUEL SYSTEMS in SYSTEM & COMPONENT TESTING - 4.3L CHEVY EXPRESS & SAVANA article.
- Perform fuel injector balance test. See FUEL SYSTEMS in SYSTEM & COMPONENT TESTING - 4.3L CHEVY EXPRESS & SAVANA article.
- Test for low fuel pressure after a cold start or during a moderate or full throttle acceleration.
- Check for damaged spark plug wires.
- Inspect for fouled spark plugs.
- Inspect for proper ignition system performance.
- Search for Service Bulletins for calibration updates.
- Test generator output voltage.
- Inspect for a restricted exhaust. See RESTRICTED EXHAUST .