Honda city 2009 weired engine noice

[omair24]

I have honda city 2009 model. From past 2 months i have been observing some weired sound from engine like im driving a diesel car. Sometimes the noise is as smooth as it should be and sometimes its noise is like a nearly diesel engine.
Works done:
engine oil change last week.
Tuning was done 5 to 6 months ago.

[mansor4]

You can get the exhaust system checked. A loose connection or rusted pipe (with leakage) can make loud sound.

[flyingfeather]

Look for any broken rubber of exhaust pipe.