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Hello, I am Jose Sebastian. Your automotive expert, It's a pleasure to me to attend your question. Thank you very much for trust in just answer.
Dear customer, does the smoke you notice have a characteristic smell like burnt plastic?
Dear customer, do you feel that the vehicle is losing power?
Do you also notice that the vehicle consumes more fuel than usual?
Dear customer, it is possible that fuel is leaking or an injector is sending more fuel than usual, if the fuel injection system has not been serviced for a long time this is normal.
To correct this you should calibrate the injectors and the pump on a test bench, also check the seals and the liners where the injectors rest.
Dear customer, the exhaust system of the vehicle has been removed.
Dear customer, then you must have the problem with the exhaust, the dpf should not be removed, not having dpf can be dangerous for the exhaust system of the engine because you can clog it.
In this case it is possible that you have clogged the exhaust system and the smoke is looking for where to go out, it may be breaking some exhaust gasket how it may be by the same valve e g r what you removed.
Dear customer, the dpf should not have been removed, in this case reinstalling one can be costly, I could give you an approximate price but I know that exhaust systems have a high cost.
Anyway if the vehicle does not need the mot you can continue to use it.
Is there anything else I can help you with?
Dear customer I recommend that you leave the original exhaust system back on, reinstall a dpf and e g r valve, never condemn these systems as they are an important part of the engine's performance.
I hope this info to be helpful, my goal is to give you the best advice i can, I hope to be helpful, if you have any doubt or want to know anything else please do not hesitate to reply back.
Kind regards, Sebastian.