Quote:
Originally Posted by RichardM98
If you can get under the car you might use a rubber mallet to check the cats. If they make a noise they could be failing.
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That seems to be the case -- with one of the secondary cats in the middle of the car. The two forward ones with the O2 sensors are fine.
Because the secondaries are not regulated, the tech suggested cutting them out and replacing with just pipe, which he said would improve my fuel economy and performance. (Over the past year I have indeed been using more fuel and the car seems a bit slower on acceleration).
I asked about back-pressure issues and he said the resonator and rear muffler provide most of that.
I will likely follow his suggestion or at least weld in an aftermarket Magnaflow in place of the broken cat. Has anyone else done this?
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2008 E350 4matic / Black/Anthracite
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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black
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