Checking idle speed adjusting CO Tools

125/03

No.

Description

Special Tool

Order number

Remarks

1

Exhaust adapter

Standard from: e.g. Sun Electric, Bosch; refer to the Workshop Handbook

2

Ratchet 1/4 inch to adjust the CO value

W 166

W 166

3

Insert for Allen screw

W 165

W 165

Exhaust test:

Checking idle speed/CO -with catalytic converter

Note

It is no longer possible to adjust the idle speed and CO value for vehicles with catalytic converters. Do not disconnect the Lambda probe for the idle speed/CO check.

Precondition

Engine in faultless mechanical condition. Consumers must be switched off during the checking work. Carry out checking operations as fast as possible to ensure that the intake channels do not heat up and falsify the CO value. Ambient temperature 15 - 35° C (59 - 95 °F).

1. Mount the exhaust adapter onto the test connector of the catalytic converter.

2. Warm the engine up to operating temperature (70 - 90° C (158 - 194 °F) oil temperature)

129/03

3. Do not separate the connector for the Lambda probe. Connect the CO tester and separate rev. counter according to the manufacturer's instructions.

Idle speed 880 ± 40 rpm

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