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Home >> Chrysler >> 2002 >> Sebring LXi, 2D Coupe, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing - Coupe - 3.0L >> Idle Control Systems >> Poor Acceleration

Poor Acceleration

Most likely causes are ignition system, air/fuel mixture or compression problems. Other causes may be fuel supply and/or exhaust problems.

  1. Connect scan tool to data link connector, located under instrument panel. Turn ignition on. Using scan tool, check for Diagnostic Trouble Codes (DTC). Turn ignition off. If no DTCs exist, go to next step. If any DTCs exist, go to appropriate test under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - SEBRING COUPE & STRATUS COUPE - 3.0L article.
  2. Using scan tool, perform actuator tests No. 1, 2, 3, 4, 5 and 6: INJECTOR. See ACTUATOR TESTS  . If all injectors actuate, go to next step. If any injector does not actuate, see DTC P0201-P0206: INJECTOR CIRCUIT under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - SEBRING COUPE & STRATUS COUPE - 3.0L article.
  3. Check timing using scan tool and perform actuator test No. 17: BASIC IGNITION TIMING. See ACTUATOR TESTS  . If timing is within specification, go to next step. If timing is not within specification, check for abnormal sensor disk or sensor face making contact with trigger wheel. Recheck idle.
  4. Using scan tool, check data list items No. 11, 13, 21, 25, 27, 28, 39, 59 and 69. See DATA LIST REFERENCE  . If all data list items are okay, go to next step. If any data list item is not okay, repair or replace as necessary. Recheck idle.
  5. Using scan tool, perform actuator test No. 10: EGR SOLENOID. See ACTUATOR TESTS  . If EGR solenoid is okay, go to next step. If EGR solenoid is not okay, repair or replace as necessary. Recheck idle.
  6. Using scan tool, check data list item No. 11 and 39. See DATA LIST REFERENCE  . Voltage should fluctuate between 0-0.4 volt and 0.6-1.0 volts at idle at operating temperature. If voltage is not as specified, go to next step. If voltage is as specified, go to step  8 .
  7. Check fuel pressure. See FUEL PRESSURE TEST under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - SEBRING COUPE & STRATUS COUPE article. If fuel pressure is not as specified, repair or replace as necessary. Recheck idle. If fuel pressure is as specified, check intake manifold gaskets, air inlet hose, vacuum lines, and PCV valve. Check injectors for clogging. Repair as necessary. Recheck idle.
  8. Check fuel pressure. See FUEL PRESSURE TEST under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - SEBRING COUPE & STRATUS COUPE article. If fuel pressure is as specified, check ignition coil, cap, rotor, spark plugs and spark plug cables. Check compression, air filter, fuel lines and fuel filter. Check exhaust system for blockage. Repair as necessary. Recheck idle. If fuel pressure is not as specified, repair or replace as necessary. Recheck idle.
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