After Warm-Up
- Check EGR control valve operation.
- Perform power balance test.
- Perform appropriate test in INJECTOR MALFUNCTION diagnostic chart in I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section. Use DIAGNOSTIC CHARTS DIRECTORY table in I - SYS/COMP TESTS article to locate chart.
- Check for spark using spark tester.
- Check spark plug for improper gap or fouling.
- Ensure fuel pressure is within specification.
- Disconnect exhaust gas sensor and monitor change in driveability. If it improves, replace sensor. If not, go to 16.
- Ensure there are no vacuum leaks into intake system.
- Inspect throttle body ports and valves for deposits, wear or plugging. Clean or replace as necessary.
- Ensure engine has adequate compression.
- Check ECU harness connector.
- Try a known good ECU.