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Partial Combustion (Affected By Throttle Position)

  1. Monitor vehicle's tachometer while cranking engine (at least 250 RPM).
  2. Check fuel pump operation. See appropriate FUEL PUMP diagnostic chart in SYSTEM/COMP TESTS article. Use DIAGNOSTIC CHARTS DIRECTORY table in SYSTEM/COMP TESTS article to locate chart.
  3. Perform appropriate INJECTOR MALFUNCTION diagnostic chart in SYSTEM/COMP TESTS article. Use DIAGNOSTIC CHARTS DIRECTORY table in SYSTEM/COMP TESTS article to locate chart.
  4. Remove vacuum hose from fuel pressure regulator. Apply vacuum and pressure and monitor symptom change.
  5. Ensure fuel pressure is within specification.
  6. Ensure ignition timing is within specification.
  7. Inspect throttle body ports and valves for deposits, wear or plugging. Clean or replace as necessary.
  8. Check fast idle cam.
  9. Check idle speed control circuit. See IDLE CONTROL SYSTEM in SYSTEM/COMP TESTS article.
  10. Enter self-diagnostic Mode III and retrieve codes. If vehicle will not start, crank engine before entering self-diagnostic Mode III.
  11. For Coolant Temp Sensor, Idle Switch & Inhibit Switch: Enter self-diagnostic Mode V and monitor real-time diagnostic setting of fault codes. Perform appropriate code chart in TESTS W/CODES article.
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