Vehicles without catalytic converter Engine type M 640506

Note

No provision for idle speed adjustment is made anymore. Adjustment on the throttle body is therefore omitted.

Idle CO adjustment Adjustment requirements

Perfect mechanical condition of engine. Loads must be switched off during the checks. Run check as quickly as possible to keep the intake ducts from heating up and causing faulty CO level readings. Ambient temperature 15...35 deg. C.

1. Warm up engine to operating temperature (70...90 deg. C oil temperature).

3. The CO potentiometer is located behind the cover on the carrier plate for plug connections on the right-hand rear side of the engine compartment. Remove plugs from access hole to CO adjustment screw.

1418-24

CO adjustment: 0.5... 1.0% Right-hand turn - richer mixture Left-hand turn - leaner mixture

Checking idle speed

1. Connect separate rev counter according to manufacturer's instructions.

129/03

2. Check CO level. If the CO level is not within the specified range, correct the setting at the CO adjustment screw

24 46 19 Removing and installing intake distributor (injection system components)

No.

Designation

Removal

Installation

1

Vacuum accumulator

1

2

Vacuum line

1

3

Branch piece

1

4

Plug 4.0 x 10

1

5

Check valve

1

Check for free flow (flow is only possible in one direction). Black side faces intake distributor

6

Line to intake distributor (RH connection)

1

7

Line to vacuum shift valve

1

8

Oval-head screw M 5.0 x 12

2

9

Vacuum shift valve

1

10

Line to vacuum modulator

1

11

Oval-head screw

5

12

Vacuum modulator for tuning flap

1

13

Line

1

14

Tank vent

1

May be checked via "Drive links" menu item. Observe correct flow direction!

Arrow points towards intake distributor

15

Line to fuel pressure regulator (length 580 mm)

1

16

Hose clamp 25 - 40/9

2

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