Technical Exhaust and katalysator

[Amir]

I was at the mechanic for exhausts and explained the problem that happened to me. My brother was driving hard few nights ago and after that kind of driving the centre console got hot and you could see smoke coming from it and the mechanic said that it is the first exhaust that comes after the engine. But he said that if I don't get it fixed, I must buy the whole exhaust, from first to the last one, it will damage my engine and I noticed that the temperature goes high after that hard driving a few nights ago. So the problem is with the katalysator, maybe you call this thing differently. It has to be changed every 100 000 km, I bought it with 150 000 and didn't know that. When the exhaust gets hotter, when you drive hard the inside of the katalysator is melting, the thing that is filtering air, and it goes to the other parts of the exhaust and to the lambda sonde so it blocks the gases to go out. That is thing why the engine temp goes up and it harms the engine. So mechanic said that this is very risky and that I could danage the engine very much.

Did anyone had this sort of thing? I can't find the whole exhaust so my car is in my garage waiting for me to find. And I need money too.
Is it true that it will harm the engine? He said that this is why my car is spending more petrol.
Just to let you know what the mechanic said and to inform you of this sort of thing.

 

[jug]

we call it a catalytic converter, if it fails your emissions will be higher whihc isnt good for the environment, but cars dont need a cat to work well, in fact ther perform better without a cat fitted. if the lamdba sensor is damaged (it will be if its as old as the cat, change both) then the car wil use more petrol becuase the fueling is partly controlled by the signal the ecu recieves from the lambda sensor. this sensor helps the engine make sure a complete burn is created in the cylinders, which will mean economy and performance suffer from a faulty lambda sensor. it wil usually make no difference when cold, you notice a loss of performance when warm or hot. this is because the lambda sensor doesnt send a useful signal to the ecu until it has reached its operating temperature, whihc can take some time. i have witnessed by cat glowing and melting when my 1.6 bravo had an injector failure because unburnt fuel was collecting in it then igniting when the car got warmed up. it smelt very bad.

 

[Amir]

So you know that I have faulty injectors so this is why I have low performance and it uses more petrol. No one could find out what it is with connecting the ecu to a computer. Now I know that I have to change the whole exhaust, which is expensive but do I really need new lambda sensor??!! It's price is similar to exhaust's. I mean, lambda sensor is also expensive. But if I have to change it, I will change it. Maybe find it somewhere on the scrapy yard but this is going to be hard, because in my place is very hard to find Brava/Bravo cars that are out of use.

 

[jug]

get the lambda tested to see if it needs replacing.