Adjusting the Pierburg 2E3 carburetor (VW Golf 2)

Accelerator pump performance

In order to check the performance of the accelerator pump without removing the carburetor, a vacuum pump is required. If such a pump is not available, the carburetor must be removed. Measure the performance of the pump using the method described below. Prepare a funnel and a measuring container.

Start the engine to fill the float chamber with gasoline. Remove the air filter and carburetor. Remove the carburetor carefully so as not to spill gasoline from it.

Rotate disc 1 (figure 145) so that it does not touch the fast idle speed adjustment bolt 2. Leave the disc in this position.



Place the carburetor over a funnel inserted into a measuring cup.

Turn the throttle lever several times until fuel appears from the sprayer. Make 5 full slow openings of the throttle. Each movement should last at least 1 second with 3-second breaks. Divide the amount of gasoline collected in the measuring cup by 5, the result is the pump capacity per one stroke of the membrane (diaphragm). It should be (1.0±0.15) cm.



If necessary, adjust the pump output. Loosen the lock screw 1 (figure 146) and turn cam 2. When turning in the direction of arrow "A", the pump performance increases, and in the direction of arrow "8", it decreases.



After finishing the adjustment, tighten screw 1 and fill the head with paint. The fuel jet from the nozzle of the accelerator pump sprayer should exactly fall into the corresponding cutout (arrow in figure 147). If this is not observed, the spray tube should be carefully bent with pliers. The adjustment is important and should be made according to the drawing.

Installing the 2nd chamber damper

Screw 2 (figure 148), used to adjust the installation of the 2nd chamber, is set at the factory. Its position cannot be changed. If necessary, adjust the position of the screw as follows:




Open the 1st chamber flap and lock it by inserting a round rod (arrow in figure 148).

Use a rubber band to pull back lever 1, which serves to close the shutter of the 2nd chamber.

Unscrew screw 2 so that there is a small gap between its end and limiter 3 (the thickness of thin paper).

Screw screw 2 back in until it touches the stopper, from this position, tighten it another 1/4 turn. In the s-th position, lock the screw with paint.

Remove the rubber band, take out the rod and check that both flaps are closed.

Check the clearances of the closing lever.

Gap "A" (figure 149) should be equal to 0.25-0.55 mm, and "B" - 0.85-1.15 mm.



If necessary, adjust the gaps by bending the lever frame.

After installing the carburetor, check the idle speed adjustment by measuring the CO content.

To check the air damper clearance, remove the starter cover.

Open the throttle valve and turn the step dial 1 (figure 150) so that the adjusting screw 2 rests on its highest step.



Insert the air damper control rod into the vacuum limiting device until it stops.

Insert drill bit 2 between the air damper and the housing (figure 151) diameter 2.7 mm. If the drill does not fit (taking into account the permissible deviation of ±0.10 mm), it is necessary to make adjustments using a screwdriver by turning screw 1.

Setting the idle speed to "fast"

If a cold engine stalls, then you should adjust the so-called "fast" idle speed without removing the carburetor. The engine should be warmed up, and the ignition and idle speed should be adjusted correctly, then do the following:

• Connect the tachometer.
• Remove the air filter and close the temperature controller connection.
• Start the engine.
• Check the engine speed and if it is not in the range of 1990-2100 rpm, it must be set with the adjusting screw (figure 152). Then seal the screw with paint to prevent it from unscrewing.
• Check the idle speed setting and adjust if necessary.

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Idle speed adjustment

The idle speed and the CO content in the exhaust gases are interdependent values. Therefore, it is necessary to first set the idle speed, and then you can start checking the composition of the exhaust gases. The engine must be warmed up, and the "fast" idle adjusting screw must not touch the stepped disk.

All electrical consumers must be switched off, this also applies to the electric fan.

Disconnect the crankcase ventilation hose from the air filter and plug its end.

The ignition must be adjusted correctly.

If a catalytic converter is installed, insert the gas analyzer probe into the pipe used to measure CO content.

The connection must be hermetically sealed, otherwise erroneous results will be obtained. If there is an additional built-in microcatalyst, the gas analyzer probe is inserted into the exhaust pipe.

Measure the idle speed with a tachometer. It should be (800±50) rpm. If necessary, adjust it using the adjusting screw 1 (figure 153).



Check the CO content in the exhaust gases. It should be within (3.0±0.5)%. Otherwise, it should be adjusted using the adjusting screw 2. To do this, remove the screw plug (blue color) and after the adjustment is completed, install it in place.

Turn off the gas analyzer. If the catalytic converter is installed, plug the pipe for measuring the CO content.

Install the crankcase ventilation hose.

The calibration data for the carburetors are given in table 6.

Adjusting the accelerator thrust

To adjust the working length of the rod, press the accelerator pedal and check the gap between the pedal and the floor with the throttle fully open. This gap should be at least 5 mm. Otherwise, release the rod mount and move the rod to another groove. Check the gap between the pedal and the floor again.

Possible malfunctions of the fuel system of carburetor engines are listed below.

The prerequisites for troubleshooting using the data in the table are the perfect adjustment and operation of the engine, ignition system and all auxiliary units, as well as a working thermostat in the air filter. The exhaust system and air intake must be tight. In addition, it is necessary to check whether the fuel supply pressure to the carburetor corresponds to the recommended one.