Checking Exhaust Emissions

arate the fuel filter from the clamp on a bench.

a new filter by reversing the procedure followed removal, following the indications given below: place the copper gaskets on the connections; he filter so that the arrow stamped onto it points e direction in which the fuel will flow.

Checking Exhaust Emissions

CAUTION: This operation should be carried out in the open or in a suitable location which fulfills the requirements of the current local regulations.

The control must be carried out with the engine at idle speed and at operating temperature (after the electric fan has cut-in and then cut-off again) If the idle speed is not within the specified values check the operation of the constant idle speed actuator.

• Check that the engine oil level is correct and that the air cleaner filter cartridge is clean.
• Start the engine and run it at idle speed.

1. Introduce the probe of the analyzer into the end of the exhaust pipe and check that the CO and HC percentages are within the specified limits.

If after checking the values are not found to be within the specified limits, consult the fault diagnosis located at the end of GROUP 04 - ENGINE MANUAL and refer to the diagnosis procedure employing the specific tool described in the "ELECTRICAL - ELECTRONIC DIAGNOSIS" MANUAL.

NOTE: THE CO PERCENTAGE CANNOT BE ADJUSTED! If the values are not within the specified limits it is necessary to act on the faulty components.

Checking the Lambda Probe

See "ELECTRICAL - ELECTRONIC DIAGNOSIS" MANUAL.