Removal
1. Working in the engine compartment, disconnect the throttle cable from the guide arm by removing the square mounting block. Release the cable by passing it through the slot in the guide arm bracket (see Fig. 7.1, a, b).
Fig. 7.1, a. Remove the square mounting block (shown by arrow)
Fig. 7.1, b....and release the cable by passing it through the groove in the guide lever bracket
2. Release the outer shell from the mounting bracket by pressing the tabs on the plastic retainer and remove it (see fig. 7.2).
Fig. 7.2. To release the cable sheath, squeeze the tabs (shown by arrows) on a plastic retainer
3. Working in the driver's footwell, unhook the return spring, then where provided, remove the retaining ring and disconnect the cable from the top of the pedal arm (see fig. 7.3).
Fig. 7.3. The device of the throttle valve dropper and cable
A Upper part of the throttle pedal
In Idle speed limiter adjusting nut
With Sealing Sleeve
D Return spring boss
E Throttle pedal end
4. Carefully push the cable housing through the engine compartment bulkhead bushing.
Note: Do not remove the bushing from the inner bulkhead.
5. From the outer bulkhead side, remove the rubber grommet, then feed the cable into the engine compartment through the grommet on the inner bulkhead.
Installation
6. Install the cable in the reverse order. Before connecting the cable to the throttle linkage, adjust the linkage and cable as described below (see fig. 7.6).
Fig. 7.6. Throttle cable assembly parts - throttle linkage side
Adjustment
Note: On vehicles equipped with the Anti-Slip Regulation (ASR) system, precise adjustment of the linkage is very difficult. It is recommended that adjustment be performed by a Bosch fuel injection specialist or a Mercedes-Benz dealer.
7. Make sure the throttle cable and linkage operate smoothly without binding or sticking. Check that there are no kinks in the cable along its entire length and lubricate the linkage if necessary.
8. At the throttle body, disconnect the throttle cable from the guide arm by removing the square mounting block. Route the cable through the slot on the side of the guide arm.
9. Remove the connecting arm pins from the spherical socket on the guide arm. (The linkage lever is a flat adjustment lever that connects the guide lever to the throttle lever).
10. Move the guide lever until the roller rests against the idle speed limiter (see fig. 7.10). With the linkage in this position, loosen the clamping screw and adjust the length of the connecting lever, if necessary, to ensure that the guide lever fits onto the spherical socket without tension.
Fig. 7.10. Move the guide lever until the roller rests against the idle speed limiter. (shown by arrow)
11. Connect the accelerator cable to the guide lever. On automatic transmission models, disconnect the pressure control cable from the guide lever.
Models with adjustable full throttle limiter behind the throttle pedal
12. The rod at the inner end of the throttle cable should rest against the spring without any play. Additionally, the guide lever should operate the idle speed microswitch, resting on the tongue. To achieve this, if necessary, turn the adjusting nut on the mounting bracket (see Fig. 7.12. a-c).
Fig. 7.12, a. The throttle cable tip rod should rest against the spring without any play
Fig. 7.12, b. The guide lever should operate the idle speed microswitch, resting on the tongue (indicated by an arrow)
Fig. 7.12, c. Adjusting nut of the full throttle opening limiter (shown by arrow) on the support bracket
13. Loosen the full opening limiter in the driver's footwell by turning the limiter pin to the left and pulling it out slightly.
14. Slowly depress the pedal until the throttle is fully open, so that the throttle lever rests against the full opening limiter on the throttle body. Then release the pedal.
15. Lock the stopper by turning the pin to the left. Be careful not to push the pin in or pull it out completely.
16. Repeat the checks described in paragraphs 7-15, inclusive, and, if necessary, adjust.
17. On vehicles with automatic transmission, install the pressure control cable and adjust its operation as described in Chapter 7B.
Models without adjustable limiter behind the pedal
18. Have an assistant press the accelerator pedal all the way down on vehicles with a manual transmission, or far enough to reach (but not to use) downshift switch, on vehicles with automatic transmission.
19. The lever should touch the full throttle limiter on the throttle body. If necessary, turn the adjusting nut on the bracket (see fig. 7.12).
20. Release the accelerator pedal again, allowing the linkage roller to rest against the idle speed limiter on the guide lever.
21. In this position, the rod at the end of the accelerator cable should rest against the spring without any play. Additionally, the guide lever should control the idle speed microswitch by resting on the tongue (see Fig. 7.12, a and b). To achieve this, if necessary, turn the adjusting nut on the cable on the accelerator pedal side - the adjusting nut can be tightened from the footwell on the driver's side (see fig. 7.3).
22. On vehicles with automatic transmission, install the pressure control cable and adjust its operation (see Chapter 7B).