Checking exhaust emissions

CAUTION: The exhaust emissions must be checked in the open air or in another suitable area equipped in accordance with the current laws.

NOTE: The checks must be carried out when the engine is at normal running temperature (i.e. after the electric fan has cut out) and at idle speed. If the idle speed value is not within the specified limits check for the correct functioning of the constant idle speed actuator.

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

1. Introduce the probe into the end of the exhaust pipe and check that the percentage of CO and HC is within the specified limits.

If the results of the test are not within the specified limits, consult the fault diagnosis at the end of this chapter and refer to the diagnosis procedure with the correct instrument described in the ELECTRICAL - ELECTRONIC DIAGNOSIS manual.

NOTE: DO NOT ATTEMPT TO ADJUST THE PERCENTAGE OF CO! If the percentage is not within the specified limits it is necessary to operate on the faulty components.