الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The growth in population plus the growth in energy consumption per person have combined together to give dramatic increases in air pollution problemsThe automotive vehicle has been asignificant contributor to air pollution, so the ad-vanced country governments made regulations for controlling this problem whereas the devel –oping countries such as Egypt do not have sufficient feeling of danger.
The aim of this work was to showe the importance of engine adjusting and maintenance according to the manufactures recommendations in idling mode, especially the major con-centration of pollutants emitted in an idling mode.
One of the common type engines in Egypt was chosen to conduct agroup of experi-ments to investigate the effect of some parameters belonging to engine, such as, the effect of mal adjustment of idle mixture metering screw, static spark plug gap, contact breaker points clearance, sparkplug seat, float carburetor clearance and inlet and exhaust valve clearances, on hydrocarbon (HC)and carbon monoxide (CO). Also, acomparison was carried out between HC and CO emissions for both conventional and the electronic ignition systems.
Expriments showed that deviations from the standard settings resulted in relative rates of increase in Hc and CO emissions.this means an increase in pollutants in crowded streets due to neglecting maintenance and ill-adjusting.
Finally, if under- developed countries get rid of old, overworked engines, or if they in-stall new devices of controlling emissions such as catalysts, they have to take much interest in maintenance and net adjustment of engines.