GM Celebrity/Century/Ciera/6000 1982-1996 Repair Guide

Early Fuel Evaporation (EFE)

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All models are equipped with this system to reduce engine warm-up time, improve driveability and reduce emissions. The system is electric and uses a ceramic heater grid located underneath the primary bore of the carburetor as part of the carburetor insulator/gasket. When the ignition switch is turned on and the engine coolant temperature is low, voltage is applied to the EFE relay by the ECM/PCM. The EFE relay in turn energizes the heater grid. When the coolant temperature increases, the ECM/PCM de-energizes the relay which will then shut off the EFE heater.

REMOVAL & INSTALLATION



EFE Grid

See Figure 1

  1. Remove the air cleaner and disconnect the negative battery cable.
  2.  
  3. Tag and disconnect all electrical, vacuum connections from the carburetor.
  4.  
  5. Unattach the fuel lines and cap them to keep from fuel spilling out, make sure to have a rag handy for any messes.
  6.  
  7. Disconnect the EFE heater electrical lead.
  8.  
  9. Remove the carburetor.
  10.  
  11. Lift off the EFE heater grid.
  12.  



Click image to see an enlarged view

Fig. Fig. 1: The EFE grid is located under the carburetor

To install:
  1. Clean the surface of the manifold where the grid is to lie, along with the bottom of the carburetor.
  2.  
  3. Install the new EFE grid to the intake manifold.
  4.  
  5. Mount the carburetor, then install all the tagged vacuum lines and electrical leads to the carburetor.
  6.  
  7. Connect the fuel lines.
  8.  
  9. Double check all the lines and hoses are properly connected, then install the air cleaner assembly.
  10.  
  11. Connect the negative battery cable.
  12.  
  13. Adjust the carburetor if needed.
  14.  

EFE Heater Relay

See Figure 2

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the retaining bracket.
  4.  
  5. Tag and disconnect all electrical connections.
  6.  



Click image to see an enlarged view

Fig. Fig. 2: The EFE heater relay is located near the fender skirt

  1. Unscrew the retaining bolts and remove the relay.
  2.  

To install:
  1. Install the new relay with the retaining bolts, tighten the bolts.
  2.  
  3. Connect the electrical wiring to the appropriate locations, then attach the retaining bracket.
  4.  
  5. Connect the negative battery cable.
  6.  

CCC SYSTEM DIAGNOSTIC CHARTS



To properly diagnose driveability problems, refer to the diagnostic trouble code charts which appear later in this section. Make certain the charts cover the appropriate engine. If your check engine light is not lit, check for engine stored engine codes. If any codes are stored write them down for reference later. Clear the codes as described earlier. Road test the vehicle to see if any of the codes return. Never try to fix a code problem until you're sure that it comes back. It may have been an old code from years ago that was never cleared or a code that was set do to a rain storm, battery jump, etc.

After clearing any codes and checking that they do not return. If the car drives fine you're finished. But if there are no codes and the car runs poorly you'll need to check the symptoms charts. The problem is most likely not the computer or the devices it controls but the ignition system or engine mechanical.

If you do have a code(s) that returns start with the lowest code and follow the proper chart. You must follow every step of the chart and not jump from test to test or you'll never be certain to find and fix the real problem.

Start with the lowest to highest code chart, making sure to use the charts for your engine. If you have a 50 series code, like code 54. Always check those out first. They are rare but usually indicate a problem with the computer itself or its ability to test itself properly.

For carburetor overhaul or service refer to Fuel System .

 
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