Carburetor Pierburg 2EZ — adjustment on the removed carburetor (Opel Ascona C)

Fast Idle Cam Position

1. The gap between the edge of the lowered valve and the wall of the neck (see section 16) must be adjusted correctly.

2. If not already done, remove the choke cover.

3. Open the throttle valve and then close the air valve by lightly pressing its drive lever. Release the throttle.

4. Check that the fast idle speed adjusting screw rests on the second highest ledge of the fast idle speed cam (see figure 3.42). If this is not the case, check the correct position of the choke release spring and then adjust the position of the screw by bending lever "2" (see figure 3.42).



5. Install and secure the choke cover, aligning the alignment marks.

(Material published on the website: www.OpelBook.ru)

Throttle clearance at fast idle

6. Set the fast idle adjustment screw to the highest cam ledge.



7. Using a drill or a gauge rod of the required diameter, measure the clearance between the primary throttle valve and the stop screw. If necessary, adjust the clearance using the fast idle screw. (This is a preliminary adjustment. Final adjustment is made with the engine running).

Accelerator pump feed

8. During this test it will be necessary to manually feed fuel into the float chamber (take necessary fire safety measures).

9. Place the primary chamber over the measuring cup. Fully open and close the throttle valve 10 times (1 sec to open, 3 sec pause after each closing). Check that the fast idle cam does not restrict the throttle travel.

10. Measure the volume of fuel supplied and divide it by 10 to determine the pump delivery per piston stroke. Compare the obtained value with the Specifications.


11. If adjustment is necessary, loosen the clamping screw and turn the cam plate in the required direction (see photo). Tighten the clamp screw and check the pump flow again.