monoxide with smell like rotten egg

Hello friends of this forum, I would like to help me with this problem
I have a client a chinese chine

Hello everyone, mechanic876, carbon monoxide is an insipid gas, it has no smell, so it is so dangerous ... the rotten egg smell, if I do not equibo, it is due to the sulfidric acid that occurs in an oxidation catalyst when it exceeds a working temperar threshold, in other words the catalyst is working too hot, which is too hot. The reasons for this high acid production, apart from low quality fuels (high sulfur) are: lack of control of the combustible air mixture, engine ignition failures, engine mechanical problems, damaged catalyst etc. If the car does not turn on the check (I would not be surprised in those chinese machines), do a gas analysis, not with the aim of seeing if a verification of exhaust gases passes, if not for diagnosis purposes ... the escape gases are an inequivococus indicator of what is happening in an engine and/or in its emission control system ... it would be good to clarify the smell of the smell of the smell cold, when leaving?, etc .. cordial greetings.

Of course it is a gas that has no smell
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The rotten egg smell is almost normal when vehicles have a catalytical combination, you will look and find and you will not find anything, it will take over time, there is no real problem, now that smell can be confused a bit when the motor refrigerant accumulates in the Catalitical or the condensation.

Hello everyone, in my opinion, that a rotten egg smell of a catalyzed motor is not normal ..., if it were, Santiago de Chile (several million cars) would stink ... Finally, a problem is subtle, for me, it does not mean that it does not exist, mood looks for the fault, if it is methodical, you will find it. Because of this, this is just an opinion. Greetings to all.