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Inspection Procedure 18 - Engine Has Poor Acceleration

NOTE: Possible causes are: defective ignition system, defective air/fuel ratio control system, defective fuel supply system, defective turbocharger system or restricted exhaust system.
  1. Using scan tool, check for stored Diagnostic Trouble Codes (DTCs). If stored DTCs exist, perform appropriate test procedures for each DTC, and clear DTCs from ECM. If no DTCs exist, go to next step.
  2. Using stethoscope, check for operating sound at injector with engine idling. If injector operating sound is heard, go to next step. If injector operating sound is not heard, check injector circuit. Perform DTC TEST NO. 12
  3. Check ignition timing. See the ADJUSTMENTS - TURBO article. If ignition timing is within specification, go to next step. If ignition timing is not correct, check for correct installation of crankshaft position sensor and timing belt cover.
  4. Perform INSPECTION PROCEDURE 38. Once inspection procedure No. 38 is performed and all components are okay, go to next step.
  5. Check fuel pressure. See the BASIC TESTING - TURBO article. If fuel pressure is not within specification, repair fuel system. If fuel pressure is within specification, go to next step.
  6. Check for defective ignition coil, spark plugs and spark plug wires. Check for restricted air filter, fuel filter, fuel lines and exhaust system. Check for low compression and broken air intake hose.
  7. Check turbocharger pressure and intake charge pressure control system. See the SYSTEM/COMPONENT TESTS article.
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