Carburetor - Rochester e2me 2-bbl Buick Regal II

COMPONENT TESTING

Note. Specific component testing information not available. Refer to any tests performed during REMOVAL & INSTALLATION or OVERHAUL procedures

GENERAL MOTORS (ROCHESTER) CARBURETOR NO. (1983 MODELS)

GENERAL MOTORS (ROCHESTER) CARBURETOR NO. (1984 MODELS)

IDENTIFICATION

The Rochester E2ME carburetor numbers are stamped vertically on the left rear corner of the float bowl. If float bowl is replaced, follow manufacturer's instructions contained in service package to transfer part number to new float bowl. Some models have machined pump wells to reduce the pump well taper. Models with machined pump wells will have the letters "MW" stamped on the float bowl near vacuum tube location "T" and the accelerator pump.

Carburetor Identification Label Original part number must be transferred from old float bowl if new float bowl is installed. Scheme 52

DESCRIPTION

The Rochester Dualjet carburetor model E2ME is a single-stage, 2-barrel downdraft carburetor. Each bore is 1-3/8" in diameter and each bore has a separate and independent idle circuit.

All E2ME models are equipped with an electrically operated mixture control solenoid. The mixture control solenoid, mounted in the fuel bowl, controls air and fuel metered to the idle and main metering systems. Fuel metering is controlled by 2 special stepped metering rods, operating in removable jets, positioned by a plunger in the mixture control solenoid.

All models are equipped with a Throttle Position Sensor (TPS), mounted in the float bowl; an Idle Speed Control (ISC) device; and models without ISC but with A/C, are equipped with an Idle Speed Solenoid (ISS). The TPS signals the Electronic Control Module (ECM) of the Computer Command Control (CCC) system on throttle position. The ISC, mounted on the fuel bowl, controls normal curb idle speed and acts as a dashpot on deceleration and throttle closing. The ISS maintains a specific idle speed during A/C operation.

Note. No attempt should be made to set curb idle speed with the Idle Speed Solenoid or the Idle Speed Control device.

All carburetors are equipped with tamper-resistant features: Factory-adjusted rich mixture stop screws, factory-adjusted lean mixture screws, riveted choke coil housings, idle air bleed valves, TPS and idle mixture needles.

All carburetors are equipped with a front vacuum break with a leaf-type bucking spring. Some models may use both a front and rear vacuum break to control choke valve openings during initial engine starting and cold driveaway.

ELECTRIC CHOKE

Note. This test should be performed when air temperature is 60-80°F (15-27°C).

1. Allow choke to cool to permit full closing of choke blade when throttle is opened slightly. Start engine and time the interval required for choke blade to reach full open position. (Start timing when engine starts). If choke blade does not fully open within 3 1/2 minutes, proceed with test.
2. With engine running, check voltage at choke heater connection. If voltage is about 12-15 volts, replace electric choke unit. If voltage is low or zero, check all wires and connections and repair as required. Power for choke unit is through the oil pressure switch. Ensure switch circuitry is good.
3. If procedure in step 2) does not correct the problem, replace oil pressure switch.

TESTING

Hard starting or poor warm-up performance may be due to a leaking vacuum break (choke pull-off) unit. If the vacuum break is leaking and not allowing the choke valve to open to the proper position, a cold engine may load up with fuel and produce black exhaust smoke.

The following testing procedure may be used to test vacuum break units

1. Determine whether the vacuum break has a bleed orifice. If so, plug bleed orifice. Most rear (secondary side) units have a bleed orifice, while most front (primary side) units do not.
2. Using a hand-held vacuum pump, apply 15 in. Hg to the vacuum break unit. Ensure that the plunger moves into its full travel position, and holds that position for at least 10 seconds. If not, replace vacuum unit.

ADJUSTMENTS

Note. For all on-vehicle adjustments not covered in this article, see appropriate TUNE-UP article.

ANGLE GAUGE ADJUSTMENT TOOL

Manufacturer recommends that some carburetor adjustments be performed using a Choke Valve Angle Gauge (Kent-Moore Tool No.(J-26701). While preparations and actual adjustment may vary with each individual adjustment, the procedure for using the angle gauge to check the choke valve angle remains the same. Use the following procedure to perform adjustments requiring the use of the choke valve angle gauge.

Choke Valve Angle Gauge This gauge must be used to perform some adjustments. Scheme 53

1. Rotate degree scale on angle gauge so that 0° mark is opposite pointer.
2. With choke valve closed, place angle gauge magnet squarely on choke valve.
3. Rotate leveling bubble on angle gauge until it is centered.
4. Rotate degree scale until specified degree mark is opposite pointer.
5. Now perform individual adjustment preparation as outlined in the following carburetor adjustments requiring an angle gauge.
6. If bubble is centered, adjustment is correct. If not, adjust carburetor as outlined in adjustment procedure.

FLOAT LEVEL (WET SETTING)

Note. This is an on-vehicle adjustment.

Scheme 54

1. With engine running at idle and choke wide open, carefully insert float gauge into vent slot or vent hole (next to air cleaner mounting stud) in air horn. Allow gauge to float freely. (Scheme 54) NOTE: Pressing down on float gauge could result in float damage or carburetor flooding. (Scheme 54): Wet Float Level Adjustment Allow float gauge to float freely.
2. With gauge floating freely, observe mark on gauge which aligns with top of casting (at eye level). Reading should be within 1/16" of specified float level. Incorrect fuel pressure will affect fuel level.
3. If reading is not within 1/16" of specified float level, remove carburetor. Remove air horn and perform Float Level (Dry Setting) adjustment.

Dry Float Level Adjustment Follow procedures to properly adjust float level. Scheme 55

Start Here

1. Remove air horn and gasket from float bowl. Hold float retainer down firmly. Lightly push float down against needle. (Scheme 55)
2. Position a "T" scale over toe of float at a point 3/16" from end of float toe. Measure distance from top of float bowl casting to top of float.
3. If float level setting varies more than 1/16" from specified setting, proceed as follows

Float Level Too High

1. Hold float retainer clip firmly in place.
2. Push down on center of float pontoon until correct float level setting is obtained.

Float Level Too Low

1. Lift out metering rods. Remove solenoid connector screws.
2. Turn lean mixture solenoid screw clockwise, counting and recording number of turns required to lightly seat screw in float bowl.
3. Turn screw counterclockwise and remove. Lift solenoid and connector from float bowl.
4. Remove float and bend arm up to adjust. Make sure float is correctly aligned after adjustment.
5. Reinstall components in reverse order that they were removed. Back out solenoid mixture screw number of turns noted in step 2).

SOLENOID LEAN MIXTURE SCREW (BENCH ADJUSTMENT)

Note. This is a preliminary adjustment only. It is required to ensure that lean mixture screw is set close to specifications prior to final adjustment. Final adjustment must be made with carburetor installed and engine running. See appropriate TUNE-UP article.

Solenoid Lean Mixture Screw Bench Adjustment Lean mixture screw should be installed with first 6 threads engaged in float bowl. Scheme 56

1. Install plastic aneroid cavity insert beneath mixture control solenoid connector in float bowl, if used. Ensure insert is installed with inset aligned with recess of bowl cavity and seated flush with bowl casting surface. Tang on upper lip of insert goes in deep slot in bowl closest to fuel inlet nut.
2. Install mixture control solenoid screw tension spring between raised bosses next to float hanger pin. Carefully install mixture control solenoid in float chamber. Align pin on end of solenoid with hole in raised boss at bottom of bowl. Align connector wires to fit in slot in bowl or plastic insert, if used.
3. Install solenoid lean mixture screw through hole in solenoid bracket and tension spring in float bowl. The first 6 threads of the mixture screw should be engaged to assure proper installation.
4. Install mixture control solenoid gauging tool over throttle side metering jet rod guide. Temporarily install solenoid plunger. (Scheme 56)
5. Hold solenoid plunger against solenoid stop. Using a "double D" wrench, slowly turn lean mixture screw clockwise until solenoid plunger just contacts gauging tool. (Scheme 56)
6. Adjustment is correct when solenoid plunger is contacting BOTH the solenoid stop and gauging tool. Remove solenoid plunger and gauging tool.

SOLENOID RICH MIXTURE STOP SCREW (BENCH ADJUSTMENT)

Note. This is a preliminary adjustment only. It is required to ensure that rich mixture stop screw is set close to specifications prior to final adjustment. Final adjustment must be made with carburetor installed and engine running. See appropriate TUNE-UP article.

Solenoid Rich Mixture Stop Screw Bench Adjustment Air horn must be properly installed prior to adjustment. Scheme 57

1. With solenoid lean mixture screw properly set and air horn installed, insert plastic float gauge in vertical "D" shaped vent hole in air horn casting.
2. With float gauge installed, read mark (in inches) on gauge that lines up with top of air horn casting at eye level. Record reading. Lightly depress float gauge and again read mark on gauge that lines up with top of casting. Record reading.
3. Subtract the 2 readings taken in step 2). This difference is the total solenoid travel. Using a "double D" wrench, turn rich mixture stop screw until total solenoid travel (difference between readings) is 4/32". (Scheme 57)
4. After adjustment, install lean mixture screw plug and rich mixture stop screw plug. Plugs must be installed to seal settings and to prevent fuel vapor loss. (Scheme 58)

Installing Lean Mixture Screw Plug & Rich Mixture Stop Screw Plug Plugs seal settings and prevent loss of fuel vapor. Scheme 58

IDLE MIXTURE (BENCH ADJUSTMENT)

Note. This is a preliminary adjustment only. It is required to ensure that mixture screws and idle air bleed valve are set close to specifications prior to final adjustment. Final adjustment must be made with carburetor installed and engine running. See appropriate TUNE-UP article.

Idle Mixture Bench Adjustment Final adjustments must be performed with carburetor installed and engine running. Scheme 59

1. With air horn properly installed, lightly seat mixture screws. Back out specified number of turns. See Idle Mixture Screw Chart. IDLE MIXTURE SCREW CHART Application Mixture Screw Preset (Turns) 17082130, 17082132 1 1/4 All Others (1) 3 (1) Final adjustment performed on-vehicle.
2. The idle air bleed valve is sealed with a riveted cover. This cover should not be removed unless required for cleaning, part replacement, improper dwell readings, or if Computer Command Control System Performance Check indicates that carburetor requires adjustment.
3. If idle air bleed cover was previously removed, or if conditions described in step 2) are met, check idle air bleed valve for a letter inscribed on top of valve. This will determine the correct on-vehicle adjustment procedure.
4. To adjust idle air bleed valve, if required, insert air bleed valve gauging tool in throttle side "D" shaped vent hole in air horn casting. Upper end of tool should be positioned over open cavity next to valve. (Scheme 59)
5. Hold the gauging tool down lightly so solenoid plunger is against solenoid stop. Adjust air bleed valve so gauging tool will pivot over and just contact top of valve. (Scheme 59)

ACCELERATOR PUMP

No pump adjustment is required on carburetors for the Computer Command Control system.

CHOKE COIL LEVER

Note. Choke coil cover uses rivets in place of retaining screws. If necessary to remove choke coil cover, refer to Disassembly and Reassembly procedures in this Section.

Choke Coil Lever Adjustment Bend choke rod to adjust. Scheme 60

1. Remove retaining rivets. Remove choke cover and coil assembly from choke housing. (Scheme 60)
2. Position fast idle speed cam follower on high step of fast idle cam.
3. Push up (counterclockwise) on choke coil tang to close choke valve.
4. Insert specified drill or pin gauge in hole provided in choke housing. Lower edge of choke lever inside housing should just touch drill or pin gauge.
5. To adjust, bend choke rod. (Scheme 60)

CHOKE ROD (FAST IDLE CAM)

Note. Choke coil lever adjustment must be correct before performing this adjustment. Fast idle speed adjustment must be performed using the Emission Control Tune-Up Decal with carburetor installed and vehicle running. Adjustment is performed with choke valve angle gauge. See procedure at beginning of Adjustments. DO NOT remove rivets and choke cover to perform this adjustment.

Choke Rod (Fast Idle Cam) Adjustment Bend tang on fast idle cam to adjust. Scheme 61

1. Attach rubber band to Green tang of intermediate choke shaft. Open throttle to allow choke valve to close. Set up angle gauge.
2. Place fast idle speed cam follower on second step of fast idle cam against shoulder of highest step. If cam follower does not contact cam, turn in fast idle speed screw additional turns. (Scheme 61)
3. Bubble on choke angle gauge should be centered with specified angle mark opposite pointer.
4. To adjust, bend tang on fast idle cam until bubble of choke valve angle gauge is centered.

Front Vacuum Break Adjustment Turn vacuum break adjustment screw to adjust. Scheme 62

Note. Choke coil lever and choke rod (fast idle cam) adjustments must be correct before performing this adjustment. Adjustment is performed with choke valve angle gauge. See procedure at beginning of Adjustments. DO NOT remove rivets and choke cover to perform this adjustment.

1. Attach rubber band to Green tang of intermediate choke shaft. Open throttle to allow choke valve to close. Set up angle gauge.
2. Using an outside vacuum source of at least 18 in. Hg, seat primary (front) vacuum break diaphragm. Be sure leaf bucking spring is seated against lever, if equipped. (Scheme 62) NOTE: On models equipped with air bleed, remove rubber cover from filter and plug vacuum tube with a piece of tape. If bleed hole is in end of diaphragm, plug hole in end of diaphragm with a piece of tape. Remove tape after completing adjustment.
3. Bubble on choke valve angle gauge should be centered with specified degree mark opposite pointer.
4. To adjust, turn vacuum break adjustment screw with vacuum still applied. Adjustment is correct when bubble of choke valve angle gauge is centered.

SECONDARY (REAR) VACUUM BREAK

Note. Choke coil lever and choke rod (fast idle cam) adjustments must be correct before performing this adjustment. Adjustment is performed with choke valve angle gauge. See procedure at beginning of Adjustments. DO NOT remove rivets and choke cover to perform this adjustment.

Secondary (Rear) Vacuum Break Adjustment Turn screw or bend vacuum break rod to adjust. Scheme 63

1. Attach rubber band to Green tang of intermediate choke shaft. Open throttle to allow choke valve to close. Set up angle gauge.
2. Using an outside vacuum source of at least 18 in. Hg, seat secondary (rear) vacuum break diaphragm. Be sure leaf bucking spring is compressed, if equipped. (Scheme 63) NOTE: On models equipped with air bleed, remove rubber cover from filter and plug vacuum tube with a piece of tape. If bleed hole is in end of diaphragm, plug hole in end of diaphragm with tape. On delay models with air bleed, plug end cover with an accelerator pump plunger cup. Remove tape or cup after completion of adjustment.
3. Close choke by pushing up on choke coil lever or vacuum break lever tang. Hold choke closed with a rubber band.
4. Bubble on choke valve angle gauge should be centered with specified degree mark opposite pointer.
5. To adjust on models equipped with hex adjustment, use a 1/8" hex wrench to turn adjustment screw in rear cover of vacuum break with vacuum still applied. To adjust on models without hex adjustment, support rod at "S" and bend vacuum break rod with vacuum still applied. Adjustment is correct when bubble of choke valve angle gauge is centered.

AUTOMATIC CHOKE

Note. Choke coil cover is retained in place with rivets. No adjustment is required. If necessary to remove choke coil cover, refer to Disassembly and Reassembly procedures. Only remove choke cover if major overhaul is required or if choke cover requires replacement.

CHOKE UNLOADER

Note. Choke coil lever and choke rod (fast idle cam) adjustments must be correct before performing this adjustment. Adjustment is performed with choke valve angle gauge. See procedure at beginning of Adjustments. DO NOT remove rivets and choke cover to perform this adjustment.

Choke Unloader Adjustment Bend tang to adjust. Scheme 64

1. Attach rubber band to Green tang of intermediate choke shaft. Open throttle to allow choke valve to close. Set up angle gauge. (Scheme 64)
2. Hold throttle lever in wide open position. Bubble on choke valve angle gauge should be centered with specified degree mark opposite pointer.
3. To adjust, bend choke unloader tang on fast idle lever until bubble of choke valve angle gauge is centered. Remove gauge.

M/C SOLENOID PLUNGER ADJUSTMENT

1. before adjusting idle mixture, the M/C solenoid plunger travel must be checked. Remove the air horn, M/C solenoid plunger, air horn gasket and plastic filler block.
2. Remove throttle side metering rod. Install M/C Solenoid Gauge (J-33815-1 or BT-8253-A) over the throttle side metering jet rod guide. Temporarily reinstall solenoid plunger and related parts.
3. Hold the solenoid plunger down, against the bullet gauge, and use Adjuster (J-28696-10 or BT-7928) to turn lean mixture screw counterclockwise until the plunger breaks contact with the bullet gauge. Turn slowly clockwise until the plunger just contacts the bullet gauge. The adjustment is correct when the solenoid plunger contacts both the rich stop and the bullet gauge.

4-Point Adjustment Carburetors

1. Identification - Does NOT have letter on top of air bleed valve. Head plug over the solenoid stop screw.
2. Adjust idle mixture with Procedure "A".

3-Point Adjustment Carburetors

1. Identification - Has letter on top of air bleed valve and a plug over solenoid stop screw.
2. Adjust idle mixture with Procedure "B".

If adjustment of the M/C solenoid screw was less than 3/4 turn, the original setting was correct. Remove solenoid plunger and bullet gauge, and reinstall metering rod and plastic filler block. Remove lean mixture screw plug and the rich mixture stop screw plug, and reassemble carburetor. Insert external float gauge in vent hole. Using Adjuster (J-28696-10 or BT-7928), adjust rich mixture stop screw to obtain 4/32" total plunger travel.

IDLE AIR BLEED VALVE - PROCEDURE A

1. This procedure is necessary only if idle air bleed valve was serviced prior to on-vehicle adjustment. Preset the idle air bleed valve by installing Idle Air Bleed Valve Gauge (J-33815-2 or BT-8253-B) in throttle side "D" shaped vent hole in the air horn casting. Upper end of tool should be positioned over open cavity, next to idle air bleed valve. Hold gauge down lightly, so solenoid plunger rests against solenoid stop. Make sure gauge can pivot over, and makes contact with top of valve. The valve is now preset for on-vehicle adjustment.
2. Adjust idle air bleed valve as follows. Block drive wheels. Place transmission in Park or Neutral, and set parking brake. Start engine and warm to normal operating temperature. While idling in Drive for automatic transmission, or in Neutral for manual transmission, slowly turn valve until dwell reading varies between 25-35 degree range. Attempt to bring reading as close to 30 degrees as possible. Perform this step carefully. The air bleed valve is very sensitive and should be turned in 1/8 turn increments only. If the dwell reading does not vary, and is not in 25-35 degrees range after the above, remove the plugs and adjust the idle mixture screws.
3. Set idle mixture screws, if necessary, by using Idle Mixture Socket (J-29030-B) or BT-7610-B). Turn both idle mixture screws clockwise until lightly seated. Then turn each mixture screw counterclockwise the number of turns specified in «IDLE MIXTURE (BENCH ADJUSTMENT)»(/buick/regal/ii-1978-1987/remont/testing-diagnostics/#carburetor-rochester-e2me-2-bbl__idle-mixture-bench-adjustment) portion of this article. Reinstall carburetor on engine using a new flange gasket, but do not install air cleaner.
4. Readjust idle air bleed valve is mixture screws required setting. Start engine and run until fully warm, and repeat the idle air bleed valve procedure. If unable to set dwell to 25-35 degrees and the dwell is below 25 degrees, turn both mixture screws counterclockwise an additional turn. If the dwell is above 35 degrees, turn both mixture screws clockwise one turn. Readjust idle air bleed valve to obtain dwell limits.
5. After adjustments are complete, seal the idle mixture screw openings in the throttle body using silicone sealant, or RTV rubber. Sealing is required to discourage unnecessary adjustment of the setting, and to prevent fuel vapor loss in that area. Perform idle speed adjustments if necessary. DO NOT adjust ISC or ILC. Check and adjust TPS voltage as needed.

IDLE AIR BLEED VALVE - PROCEDURE B

1. Set idle air bleed valve by installing Air Bleed Gauge (J-33815-2 or BT-8253-B) in throttle side "D" shaped vent hole in the air horn casting. Upper end of tool should be positioned over open cavity, next to idle air bleed valve. Hold gauge down lightly, so solenoid plunger rests against solenoid stop. Make sure that gauge can pivot over and make contact with top of valve. The valve is now set properly. Remove gauge.
2. Adjust idle mixture screws by removing idle mixture screw plugs. Using Idle Mixture Socket (J-29030-B or BT-7610-B), turn each idle mixture screw clockwise until lightly seated, then turn each mixture screw counterclockwise 3 turns. Reinstall carburetor on engine using a new flange mounting gasket where necessary, but do not install air cleaner.
3. Block drive wheels. Place transmission in Park or Neutral, and set the parking brake. Start engine and allow it to reach normal operating temperature. While idling in Drive for automatic transmission, or Neutral for manual transmission, adjust both mixture screws equally in 1/8 turn increments, until dwell reading varies between 25-35 degrees. Attempt to bring reading as close to 30 degrees as possible. If reading is low, turn mixture screws counterclockwise. If reading is high, turn mixture screws clockwise. NOTE: Allow time for dwell reading to stabilize after each adjustment.
4. After adjustments are complete, seal the idle mixture screw openings in the throttle body with silicone sealant or RTV rubber to prevent tampering and fuel vapor loss in that area. Perform idle speed adjustments if necessary. DO NOT adjust ISC or ILC. Check and adjust TPS voltage as needed.

DISASSEMBLY

Note. Place carburetor on a suitable working stand to avoid damaging throttle valves during overhaul.

Air Horn

1. Remove ILC, ISC or ISS and bracket assembly. Remove upper choke lever from choke shaft end by removing screw. Rotate lever to remove choke rod from slot in lever. Remove choke rod from lower (inner) choke lever inside float bowl casting. NOTE: Hold lever outward and twist rod counterclockwise to remove.
2. Using a drift punch, drive pump lever pivot pin inward until end of pin is against air cleaner locating boss on air horn casting. Remove pump lever and disconnect lever from pump link. CAUTION: Be careful when removing roll pin to avoid damage to pump lever bosses.
3. Remove front (primary) vacuum break hose from tube on float bowl and mark for reassembly reference. Remove 7 air horn screws. Then remove 2 countersunk screws located next to venturi. Lift air horn straight up to remove. Gasket should remain on float bowl. CAUTION: Use care not to damage mixture control solenoid connector, TPS adjustment lever, and small tubes protruding from air horn. DO NOT attempt to remove small tubes.
4. Remove front (primary) vacuum break diaphragm and bracket assembly. Remove TPS plunger by pushing plunger up through seal in air horn. Use fingers only to remove plunger to prevent damage to sealing surface.
5. After removing air horn, lean mixture screw and rich mixture stop screw plugs must be removed. To remove plugs, invert air horn and drive out from bottom side. Discard plugs. NOTE: DO NOT turn rich mixture stop screw in air horn unless screw requires replacement or solenoid plunger travel is incorrect.
6. Remove TPS seal by inverting air horn and remove staking from around seal retainer with a small screwdriver. Remove and discard retainer and seal. Use care removing retainer and seal to prevent damage to air horn casting.
7. Further disassembly of air horn assembly is not required for cleaning purposes. Choke valve and choke valve screws should not be removed. The air horn has an idle air bleed valve which is preset at the factory and sealed. The idle air bleed valve should not be removed from air horn unless System Performance Check of Computer Command Control system indicates need for adjustment or repair. NOTE: Air horn assembly, with idle air bleed valve installed, should be cleaned only in low volatile cleaning solvent. DO NOT place air horn (with idle air bleed valve) in carburetor cleaner. No tamper-resistant plug should be removed during normal carburetor cleaning and servicing unless carburetor or mixture control solenoid has been diagnosed as cause of poor engine performance.
8. If necessary to replace idle air bleed valve or disassemble air horn for immersion in carburetor cleaner, cover internal bowl vents and air inlets to bleed valve with tape. Drill off rivet heads of bleed valve cover with a .110" (No. 35) drill. Drive remainder of rivet out of tower with drift and small hammer. Lift out cover over valve and remove remaining rivet pieces from inside tower.
9. After removing cover, check for letter identification on top of idle air bleed valve. This will determine the necessary adjustment procedure after reassembly. Turn valve counterclockwise and remove from air horn. Remove and discard "O" ring seals from air bleed valve. Air bleed valve is serviced as a complete assembly only.

Scheme 65

1. Hold pump plunger stem down and raise corner of air horn gasket to remove pump plunger from pump well. Remove solenoid metering rod plunger by lifting straight up. Remove rubber seal from around mixture control solenoid connector. Remove air horn gasket by lifting off dowel locating pins. Discard gasket.
2. Remove pump return spring from pump well. Remove staking holding Throttle Position Sensor in bowl. To do so, protect gasket sealing surface by laying a flat piece of metal across casting.
3. Using a small screwdriver, lightly depress and hold TPS sensor down against spring tension. Carefully remove staking from around TPS sensor by prying upward with a small chisel against the metal piece (not bowl casting).
4. Push up from bottom on electrical connector and remove TPS and connector assembly from bowl. Use care not to damage sensor during removal. Remove spring from bottom of TPS well in float bowl. Remove plastic filler block over float chamber.
5. Carefully remove each metering rod from metering jet. Make sure return spring is removed with each rod. Remove the spring by sliding off metering rod.
6. Remove mixture control solenoid-to-float bowl screws. DO NOT remove solenoid connector from float bowl at this time.
7. Using Adjustment Tool (J-28696-10) on upper end of lean mixture screw, turn screw counterclockwise and remove. Carefully lift solenoid and connector assembly from bowl. (Scheme 65): Exploded View of Rochester E2ME 2-Barrel Carburetor NOTE: DO NOT remove plunger return spring or connector and wires from solenoid body. Solenoid and connector are serviced as an assembly.
8. If equipped, remove plastic insert from cavity in float bowl beneath solenoid connector. Remove solenoid screw tension spring (next to float hanger clip).
9. Remove float assembly and needle valve by lifting straight up on retaining clip. Remove needle valve seat and gasket.
10. Remove large mixture control solenoid tension spring from boss on bottom of float bowl located between metering jets. Remove metering jets (if necessary).
11. Remove accelerator pump discharge check ball retainer and check ball. Remove accelerator pump well baffle (if necessary).
12. If equipped, remove secondary (rear) vacuum break diaphragm and bracket. Rotate unit to remove vacuum break rod from slot in diaphragm plunger. Vacuum break link is not removed until choke assembly is removed from float bowl.
13. Align a.159" (No. 21) drill on choke cover retaining rivets and drill only enough to remove each rivet head. Drive out remainder of rivets with drift and hammer.
14. Remove 3 retainers and choke cover assembly. Remove screw and washer from inside housing. Slide housing out. Remove lower choke lever from inside float bowl cavity by inverting bowl.
15. If equipped, remove secondary (rear) vacuum break rod from intermediate choke lever. Remove choke coil lever screw from end of intermediate choke shaft in choke housing.
16. Remove choke coil lever from intermediate choke shaft. Remove intermediate choke shaft from housing by sliding outward. Remove fast idle cam from intermediate choke shaft. Turn float bowl over and remove lower choke lever.
17. Remove fuel inlet fitting, gasket, check valve/filter assembly and spring. Remove throttle body screws. Separate throttle body from float bowl and remove insulator gasket.

Throttle Body

1. Remove accelerator pump rod from throttle lever by rotating rod until tang on rod aligns with slot in lever.
2. Turn throttle body over and position on a holding fixture with manifold side up. Make 2 parallel cuts in throttle body with a small hacksaw, one on each side of idle mixture needle plug.
3. Cuts should reach down to steel plug, but no more than 1/8" beyond locator points. Distance between saw marks will depend upon size of punch used.
4. Place a flat punch at a point near ends of saw marks. Hold punch at 45° angle and drive it into throttle body until casting breaks away, exposing steel plug.
5. Hold center punch vertically and drive into steel plug. Then hold punch at 45° angle and drive plug out of casting. Repeat process for remaining mixture needle. When removing or installing needles, refer to Idle Mixture (Bench Adjustment) procedure in this Section.

Note. Hardened steel plug will shatter. It is not necessary to remove plug completely. Remove just enough pieces to allow idle mixture adjusting tool to be used to remove mixture screws and springs. Idle mixture screw head has a "double-D" configuration and can also be removed using a piece of 7/32" copper tubing that has been partially flattened.

CLEANING & INSPECTION

1. Use a regular carburetor cleaning solution. Soak components long enough to thoroughly clean all surfaces and passages of foreign matter.
2. DO NOT soak any components containing rubber, leather or plastic. Particularly do not soak air horn with bleed valve installed, electric choke, ISS, ISC, TPS, thermostatic choke cover and coil, vacuum break diaphragms, pump plunger and other such parts.
3. Remove any residue after cleaning by rinsing components in a suitable solvent.
4. Blow out all passages with dry compressed air.

Note. If idle air bleed valve is not removed from carburetor, air horn should be cleaned with a low volatile cleaning solvent. DO NOT place air horn in carburetor cleaner. Damage to "O" rings may occur.

Air Horn Screw Tightening Sequence Screws 1 and 2 are countersunk next to venturi. Scheme 66

REASSEMBLY

Note. Use new gaskets and seals. Make sure that new gaskets fit correctly and that all holes and slots are punched through and correctly located.

Reassemble carburetor in reverse order of disassembly, noting the following

1. The intermediate choke shaft lever and fast idle cam are assembled correctly when tang on lever is beneath fast idle cam.
2. When installing float and retaining pin, make sure open end of float retaining pin faces accelerator pump well.
3. When installing fuel inlet valve, hook pull clip over edge of flat on float arm. DO NOT hook clip in holes in float arm.
4. When installing mixture control solenoid, make sure pin on end of solenoid aligns with hole in raised boss at bottom of float bowl.
5. Install, adjust and plug all screws to restore tamper-resistant design. NOTE: If choke coil cover was removed, it will be necessary to install service rivet retaining kit. Before installing cover, place fast idle screw on high step of fast idle cam. Align notch in cover with raised boss on housing cover flange and install rivets.
6. Install air horn screws and tighten securely, evenly and in order (Scheme 66)

SPECIFICATIONS

CARBURETOR ADJUSTMENT SPECIFICATIONS

See also:
• IDLE MIXTURE (BENCH ADJUSTMENT)