My 1995 C220 petrol engine suffered a very gradual decline in power over many months. It never was very sporty when I got it 5 years ago but it ended up not being able to go over 25 mph. Another cat changed all that and it's quite a goer now. However, while with the old cat putting your foot down resulted in a lot of underlying noise from the engine and exhaust and a struggle to go faster, the new situation's more worrying.
Now kick-down results in a good surge of power and quick acceleration as well as a heavy rattling noise that seems to come from the engine at 3500 rpm or above...and not with any lower revs. Gradual acceleration makes no such noise.
Is this the fault of the new non-MB cat...the new one's half the volume and has an extra silencer box to make up the space...or is it something a blocked cat stopped me from hearing before?
I hope I haven't got an inexpensive cat and an expensive problem!
Now kick-down results in a good surge of power and quick acceleration as well as a heavy rattling noise that seems to come from the engine at 3500 rpm or above...and not with any lower revs. Gradual acceleration makes no such noise.
Is this the fault of the new non-MB cat...the new one's half the volume and has an extra silencer box to make up the space...or is it something a blocked cat stopped me from hearing before?
I hope I haven't got an inexpensive cat and an expensive problem!
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