Chevrolet Citation/Omega/Phoenix/Skylark 1980-1985 Repair Guide

Carburetors

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Fig. Fig. 1 Fig. 3 The carburetor identification number is stamped on the float bowl

The Rochester 2SE and E2SE Varajet II carburetors are two barrel, two stage down-draft units. Most carburetor components are aluminum, although a zinc choke housing is used on the four cylinder engine installations. The E2SE is used both in conventional installations and in the Computer Controlled Catalytic Converter System. In that installation, the E2SE is equipped with an electrically operated mixture control solenoid, controlled by the Electronic Control Module. On 1981 and later vehicles, the 2SE carburetor is no longer used. The E2SE equipped with the electronically operated mixture control solenoid is used exclusively in conjunction with the Computer Command Control System.

REMOVAL & INSTALLATION



  1. Remove the air cleaner and gasket.
  2.  
  3. Disconnect the fuel line. Tag and detach the vapor hoses and electrical connectors from the carburetor.
  4.  
  5. Disconnect the accelerator linkage.
  6.  
  7. Remove the mounting bolts and remove the carburetor and gasket.
  8.  
  9. Before installing the carburetor, fill the float bowl with gasoline to reduce battery strain and the possibility of backfiring when the engine is started.
  10.  
  11. Check the mating surfaces on the carburetor and intake manifold for cleanliness. Install a new gasket.
  12.  
  13. Place the carburetor on the gasket and loosely install the attaching bolts.
  14.  
  15. Install the vacuum lines and loosely install the fuel line.
  16.  
  17. Tighten the carburetor mounting nuts evenly to 145 inch lbs. (16 Nm).
  18.  
  19. Tighten the fuel line. Connect the accelerator linkage and electrical connectors.
  20.  
  21. Adjust the idle speed and install the air cleaner.
  22.  

ADJUSTMENTS



Float


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Fig. Fig. 2 Carburetor float adjustment

  1. Remove the air horn from the throttle body.
  2.  
  3. Use your fingers to hold the retainer in place, and to push the float down into light contact with the needle.
  4.  
  5. Measure the distance from the toe of the float (furthest from the hinge) to the top of the carburetor (gasket removed).
  6.  
  7. To adjust, remove the float and gently bend the arm to specification. After adjustment, check the float alignment in the chamber.
  8.  

Pump


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Fig. Fig. 3 Pump adjustment-1980 vehicles only

1981 and later E2SE carburetors have a non-adjustable pump lever. Therefore, no adjustments are necessary or possible.

  1. With the throttle closed and the fast idle screw off the steps of the fast idle cam, measure the distance from the air horn casting to the top of the pump stem.
  2.  
  3. To adjust, remove the retaining screw and washer and remove the pump lever. Bend the end of the lever to correct the stem height. Do not twist the lever or bend it sideways.
  4.  
  5. Install the lever, washer and screw and check the adjustment. When correct, open and close the throttle a few times to check the linkage movement and alignment.
  6.  

Fast Idle Adjustment


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Fig. Fig. 4 Fast idle adjustment-1980 vehicles



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Fig. Fig. 5 Fast idle adjustment-1981-85 vehicles

  1. Set the ignition timing and curb idle speed, and disconnect and plug hoses as directed on the emission control decal.
  2.  
  3. Place the fast idle screw on the highest step of the cam.
  4.  
  5. Start the engine and adjust the engine speed to specification with the fast idle screw.
  6.  

Choke Coil Lever


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Fig. Fig. 6 Choke coil lever adjustment-4-cylinder engines



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Fig. Fig. 7 Choke coil lever adjustment-V6 engines

  1. Remove the three retaining screws and remove the choke cover and coil. On models with a riveted choke cover, drill out the three rivets and remove the cover and choke coil.
  2.  

A choke stat cover retainer kit is required for reassembly.

  1. Place the fast idle screw on the high step of the cam.
  2.  
  3. Close the choke by pushing in on the intermediate choke lever. On V6 models, the intermediate choke lever is behind the choke vacuum diaphragm.
  4.  
  5. Insert a drill or gauge of the specified size into the hole in the choke housing. The choke lever in the housing should be up against the side of the gauge.
  6.  
  7. If the lever does not just touch the gauge, bend the intermediate choke rod to adjust.
  8.  

Fast Idle Cam (Choke Rod)


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Fig. Fig. 8 Fast idle cam (choke rod) adjustment-4-cylinder engines



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Fig. Fig. 9 Fast idle cam (choke rod) adjustment-V6 engines

A special angle gauge should be used. If it is not available, an inch measurement can be made.

  1. Adjust the choke coil lever and fast idle first.
  2.  
  3. Rotate the degree scale until it is zeroed.
  4.  
  5. Close the choke and install the degree scale onto the choke plate. Center the leveling bubble.
  6.  
  7. Rotate the scale so that the specified degree is opposite the scale pointer.
  8.  
  9. Place the fast idle screw on the second step of the cam (against the high step). Close the choke by pushing in the intermediate lever.
  10.  
  11. Push on the vacuum break lever in the direction of opening choke until the lever is against the rear tang on the choke lever.
  12.  
  13. Bend the fast idle cam rod at the U to adjust the angle to specifications.
  14.  

Air Valve Rod
1980 VEHICLES


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Fig. Fig. 10 Air valve rod adjustment-1980 vehicles

  1. Seat the vacuum diaphragm with an outside vacuum source. Tape over the purge bleed hole if present.
  2.  
  3. Close the air valve.
  4.  
  5. Insert the specified gauge between the rod and the end of the slot in the plunger on fours, or between the rod and the end of the slot in the air valve on V6s.
  6.  
  7. Bend the rod to adjust the clearance.
  8.  

1981-85 VEHICLES


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Fig. Fig. 11 Air valve rod adjustment-1981-85 4-cylinder engines



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Fig. Fig. 12 Air valve rod adjustment-1981-85 V6 engines

A special angle gauge should be used. If it is not available, an inch measurement can be made.

  1. Align the zero degree mark with the pointer on an angle gauge.
  2.  
  3. Close the air valve and place a magnet on top of it.
  4.  
  5. Rotate the bubble until it is centered.
  6.  
  7. Rotate the degree scale until the specified degree mark is aligned with the pointer.
  8.  
  9. Seat the vacuum diaphragm using an external vacuum source.
  10.  
  11. On four cylinder models plug the end cover. Unplug after adjustment.
  12.  
  13. Apply light pressure to the air valve shaft in the direction to open the air valve until all the slack is removed between the air link and plunger slot.
  14.  
  15. Bend the air valve link until the bubble is centered.
  16.  

Primary Side Vacuum Break
1980 VEHICLES


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Fig. Fig. 13 Primary side vacuum break adjustment-1980 4-cylinder engines



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Fig. Fig. 14 Primary side vacuum break adjustment-1980 V6 engines

  1. Follow Steps 1-4 of the Fast Idle Cam Adjustment.
  2.  
  3. Seat the choke vacuum diaphragm with an outside vacuum source.
  4.  
  5. Push in on the intermediate choke lever to close the choke valve, and hold closed during adjustment.
  6.  
  7. Adjust by bending the vacuum break rod until the bubble is centered.
  8.  

To adjust the vacuum break on the 1981 engines, use a 1 / 8 in. hex wrench and turn the screw in the rear cover until the bubble is centered.

1981-85 VEHICLES


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Fig. Fig. 15 Primary side vacuum break adjustment-1981-85 4-cylinder engines



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Fig. Fig. 16 Primary side vacuum break adjustment-1981-85 V6 engines

A special angle gauge should be used. If it is not available, an inch measurement can be made.

Prior to adjustment, remove the vacuum break from the carburetor. Place the bracket in a vise and, using the proper safety precautions, grind off the adjustment screw cap, then reinstall the vacuum break.

  1. Rotate the degree scale on the measuring gauge until the zero is opposite the pointer.
  2.  
  3. Seat the choke vacuum diaphragm by applying an external vacuum source of over 5 in. vacuum to the vacuum break.
  4.  

If the air valve rod is restricting the vacuum diaphragm from seating, it may be necessary to bend the air valve rod slightly to gain clearance. Make an air valve rod adjustment after the vacuum break adjustment.

  1. Read the angle gauge while lightly pushing on the intermediate choke lever so that the choke valve is toward the close position.
  2.  
  3. Use a 1 / 8 in. hex wrench and turn the screw in the rear cover until the bubble is centered. Apply a silicone sealant over the screw head to seal the setting.
  4.  

Electric Choke Setting

This procedure is only for those carburetors with choke covers retained by screws. Riveted choke covers are preset and nonadjustable.

  1. Loosen the three retaining screws.
  2.  
  3. Place the fast idle screw on the high step of the cam.
  4.  
  5. Rotate the choke cover to align the cover mark with the specified housing mark.
  6.  

Secondary Vacuum Break
1980 VEHICLES


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Fig. Fig. 17 Secondary vacuum break adjustment-1980 V6 engines

This procedure is for V6 installations only.

  1. Follow Steps 1-4 of the Fast Idle Cam Adjustment.
  2.  
  3. Seat the choke vacuum diaphragm with an outside vacuum source.
  4.  
  5. Push in on the intermediate choke lever to close the choke valve, and hold closed during adjustment. Make sure the plunger spring is compressed and seated, if present.
  6.  
  7. Bend the vacuum break rod at the U next to the diaphragm until the bubble is centered.
  8.  

1981-85 VEHICLES


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Fig. Fig. 18 Secondary vacuum break adjustment-1981-85 V6 engines

A special angle gauge should be used. If it is not available, an inch measurement can be made.

Prior to adjustment, remove the vacuum break from the carburetor. Place the bracket in the vise, and using the proper safety precautions, grind off the adjustment screw cap, then reinstall the vacuum break.

Plug the end cover using an accelerator pump plunger cup or equivalent. Remove the cup after the adjustment.

  1. Rotate the degree scale on the measuring gauge until the zero is opposite the pointer.
  2.  
  3. Seat the choke vacuum diaphragm by applying an external vacuum source of over 5 in. vacuum to the vacuum break.
  4.  

If the air valve rod is restricting the vacuum diaphragm from seating, it may be necessary to bend the air valve rod slightly to gain clearance. Make an air valve rod adjustment after the vacuum break adjustment.

  1. Read the angle gauge while lightly pushing on the intermediate choke lever so that the choke valve is toward the close position.
  2.  
  3. Use a 1 / 8 in. hex wrench and turn the screw in the rear cover until the bubble is centered. Apply a silicone sealant over the screw head to seal the setting.
  4.  

Choke Unloader


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Fig. Fig. 19 Choke unloader adjustment

  1. Follow Steps 1-4 of the Fast Idle Cam Adjustment.
  2.  
  3. Install the choke cover and coil, if removed, aligning the marks on the housing and cover as specified.
  4.  
  5. Hold the primary throttle wide open.
  6.  
  7. If the engine is warm, close the choke valve by pushing in on the intermediate choke lever.
  8.  
  9. Bend the unloader tang until the bubble is centered.
  10.  

Secondary Lockout


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Fig. Fig. 20 Secondary lockout adjustment

  1. Pull the choke wide open by pushing out on the intermediate choke lever.
  2.  
  3. Open the throttle until the end of the secondary actuating lever is opposite the toe of the lockout lever.
  4.  
  5. Gauge clearance between the lockout lever and secondary lever should be as specified.
  6.  
  7. To adjust, bend the lockout lever where it contacts the fast idle cam.
  8.  

OVERHAUL



Efficient carburetion depends greatly on careful cleaning and inspection during overhaul, since dirt, gum, water, or varnish in or on the carburetor parts are often responsible for poor performance.

Overhaul your carburetor in a clean, dust-free area. Carefully disassemble the carburetor, referring often to the exploded view supplied in the rebuilding kit. Keep all similar and look-alike parts segregated during disassembly and cleaning to avoid accidental interchange during assembly. Make a note of all jet sizes.

When the carburetor is disassembled, wash all parts (except diaphragms, electric choke units, pump plunger, and any other plastic, leather, fiber, or rubber parts) in clean carburetor solvent. Do not leave parts in the solvent any longer than is necessary to sufficiently loosen the deposits. Excessive cleaning may remove the special finish from the float bowl and choke valve bodies, leaving these parts unfit for service. Rinse all parts in clean solvent and blow them dry with compressed air or allow them to air dry. Wipe clean all cork, plastic, leather, and fiber parts with a clean, lint-free cloth.

Blow out all passages and jets with compressed air and be sure that there are no restrictions or blockages. Never use wire or similar tools to clean jets, fuel passages, or air bleeds. Clean all jets and valves separately to avoid accidental interchange.

Check all parts for wear or damage. If wear or damage is found, replace the defective parts. Especially check the following:

  1. Check the float needle and seat for wear. If wear is found, replace the complete assembly.
  2.  
  3. Check the float hinge pin for wear and the float(s) for dents or distortion. Replace the float if fuel has leaked into it.
  4.  
  5. Check the throttle and choke shaft bores for wear or an out-of-round condition. Damage or wear to the throttle arm, shaft, or shaft bore will often require replacement of the throttle body. These parts require a close tolerance of fit; wear may allow air leakage, which could affect starting and idling.
  6.  

Throttle shafts and bushings are not included in overhaul kits. They can be purchased separately.

  1. Inspect the idle mixture adjusting needles for burrs or grooves. Any such condition requires replacement of the needle, since you will not be able to obtain a satisfactory idle.
  2.  
  3. Test the accelerator pump check valves. They should pass air one way but not the other. Test for proper seating by blowing and sucking on the valve. Replace the valve if necessary. If the valve is satisfactory, wash the valve again to remove breath moisture.
  4.  
  5. Check the bowl cover for warped surfaces with a straightedge.
  6.  
  7. Closely inspect the valves and seats for wear and damage, replacing as necessary.
  8.  
  9. After the carburetor is assembled, check the choke valve for freedom of operation.
  10.  

Carburetor overhaul kits are recommended for each overhaul. These kits contain all gaskets and new parts to replace those which deteriorate most rapidly. Failure to replace all parts supplied with the kit (especially gaskets) can result in poor performance later.

Some carburetor manufacturers supply overhaul kits of three basic types: minor repair; major repair; and gasket kits.

After cleaning and checking all components, reassemble the carburetor, using new parts and referring to the exploded view. When reassembling, make sure that all screws and jets are tight in their seats, but do not overtighten as the tips will be distorted. Tighten all screws gradually, in rotation. Do not tighten needle valves into their seats; uneven jetting will result. Always use new gaskets. Be sure to adjust the float level when reassembling.

 
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