After Deceleration
- Check fast idle system. See IDLE CONTROL SYSTEM in I - SYS/COMP TESTS .
- Inspect throttle body ports and valves for deposits, wear or plugging. Clean or replace as necessary.
- 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.
- 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.
- Check ECU harness connector.
- Check ECU power source and ground circuit. See ECU POWER SOURCE & GROUND diagnostic chart in I - SYS/COMP TESTS. Use DIAGNOSTIC CHARTS DIRECTORY TABLE in I - SYS/COMP TESTS article to locate chart.
- Try a known good ECU.