1986 Chrysler Laser XT, AutomaticFACTORY OEM SERVICE PROCEDURE

2.2L Turbo

NOTE: EGR valve stem is not visible on 2.2L Turbo EGR valves.
  1. Disconnect vacuum hose from EGR valve and connect a vacuum gauge to it. Start engine. With engine temperature below 90°F (32°C), vacuum reading should be zero. If vacuum is present, replace coolant vacuum switch. If vacuum is not present, continue test.
  2. With engine temperature still below 90°F (32°C), raise engine speed to 2000 RPM. If vacuum gauge reads zero continue test. If gauge reads an unsteady reading above zero, replace EGR solenoid.
  3. Disconnect vacuum line to EGR backpressure transducer from EGR solenoid. Connect a vacuum gauge to this line. With engine running, gauge should read at least 5 in. Hg. If correct continue test, if not check backpressure transducer operation.
  4. Start engine and wait until it is sufficiently warm to open EGR solenoid. Raise engine speed to 2000 RPM. Vacuum reading should be at least 5 in. Hg. If gauge does not read 5 in. Hg, repair vacuum supply from throttle body and solenoid. If gauge does read 5 in. Hg, system is operating correctly, remove gauge and reconnect hoses. Continue with test.
  5. Disconnect vacuum line to EGR valve vacuum motor from EGR valve/backpressure transducer, and connect a vacuum gauge to this line. Gauge should read approximately 5 in. Hg. If not, replace EGR valve/backpressure transducer assembly.
  6. connect a vacuum supply to EGR vacuum motor. Start engine and raise engine speed to 2000 RPM. Apply 2-3 in. Hg vacuum to EGR vacuum motor. Engine speed should drop. If engine speed does drop, system is okay. Continue test.
  7. With engine running at idle, slowly apply vacuum to EGR. Engine speed should drop, stumble or stall. If not, replace EGR valve/backpressure transducer and EGR tube. Before replacing assembly, check for plugged EGR supply tube or passages.
  8. With engine off, apply 10 in. Hg vacuum to EGR valve. Vacuum should hold for at least 10 seconds. If not, replace EGR valve/backpressure transducer assembly.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.