Fiat Bravo Service Manual page 45

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If the values are not within the limits set out in the government circular, the Customer must be notified of

the need to check:

- that the Lambda sensor is working properly using the Fiat/Lancia tester;

- for the presence of air penetration in the area surrounding the Lambda sensor housing;

- the injection system, particularly the wear of the spark plugs.

2. If the HC figure is more than 90 p.p.m., the cause of the problem should be sought in the engine t i m -

ing or the decreased efficiency of the catalyzer.

A I R COEFFICIENT X

Introduction

Planned maintenance

Factor X is obtained from the ratio between

the quantity of intake air and the theoretical

quantity of air required to burn all the fuel in-

To achieve an optimum mixture the quantity

of fuel injected must be as close as possible

to the theoretical quantity required to be

completely burnt in relation to the quantity of

air drawn in by the engine. In this case the

Lambda factor is equal to 1 (ideal mixture)

and the CO content is within the legal limits.

With X ^ 1 (lean mixture), excess air, the CO

tends to assume low values: w i t h X ^ 1 (rich

mixture), lack of air, the CO values tend to be