5-2. DIAGNOSIS
POSSIBLE CAUSES OF EMISSIONS TEST FAILURES
Excessive Emission
Hydrocarbons
Explanation
Possible Causes
Excessive hydrocarbons are
l
Engine not at normal operating temperature
caused by an air/fuel mixture
that is not burning completely.
l
Disconnected, obstructed, leaking, or misrouted
vacuum hoses
l
Vacuum leaks
.
l
Maladjusted idle mixture
l
Improper adjusted/sticking choke
l
Maladjusted initial spark timing
Defective spark plugs, wires or distributor cap
l
Malfunctioning MCV
l
Lead contamination of catalytic converter
l
Malfunctioning feed back system
Carbon monoxide (CO)
Excessive carbon monoxide
l
Engine not at normal operating temperature
emissions are due to a mixture
that is rich.
Maladjusted idle mixture
l
Improperly adjusted/sticking choke
l
Lead contamination of catalytic converter
l
Leaking carburetor fuel passages or gaskets
Carburetor float level
Restricted air cleaner element
l
Malfunctioning feed back system
Oxides of nitrogen
Excessive oxides of nitrogen
are generally due to high tem-
peratures in the combustion
chamber.
l
Obstructed/Ieaking/misrouted vacuum lines
Improper operation of the EGR system
l
Plugged EGR passages
l
Inoperative
or TWSV
l
Lead contamination of catalytic converter
l
Malfunctioning feed back system
5-15
Summary of Contents for Samurai 1986
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