EMISSION CONTROL SYSTEM
7-2
hicle operator in order to prevent operational
problems arising from damage to the catalyst.
Damage to the catalyst will result if contamina-
tion occurs through the use of leaded fuel. Whilst
the vehicle is fitted with a reduced diameter filler
neck to prevent charging of the fuel tank with a
leaded fuel pump nozzle, it is possible that the
use of funnels or jerry cans will permit leaded fuel
to be introduced into the fuel tank.
The catalyst is intolerant of unburnt fuel and
therefore if an engine misfire condition exists,
damage to the catalyst will occur. It is imperative
that if a misfire condition develops, the vehicle is
immediately presented to a Hyundai dealer for
rectification. Similarly, the practice of certain
ignition system diagnosis procedures which in-
volve inducing a misfire (cylinder power balance
tests for example) may result in catalyst dam-
age.
For these reasons, it is advisable that the ex-
haust gas emission be tested at each routine
service with a gas analyzer having a Hydrocar-
bon measuring facility to ensure continued reli-
ability of the catalyst.
Push or tow starting of the vehicle is to be
avoided since unburnt fuel may be enter the
catalyst and result in damage. (Note, it is impos-
sible to push or tow start a Hyundai model
equipped with fuel injection since the fuel pump
safety interlock will prevent the pump from oper-
ating under these conditions).
Operation of the catalyst involves extremely high
temperatures being attained within the catalytic
convertor, and although the convertor is fitted
with heat shields, it is important that the vehicle
is not parked over combustible or volatile mate-
rial which may result in fire.
If the above precautions are not adhered to and
the catalyst becomes inoperative, the resultant
increase in core temperature will result in a "melt
down" where the catalyst core will melt and
subsequently may block the exhaust system.
Due to the fragile nature of the catalyst element,
it is important that damage does not occur when
the vehicle is raised by means of a garage jack.
Care must also be exercised to avoid driving
over road hazards or debris which may cause
damage to the catalyst element.
