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running rich effects

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Old Dec 22, 2009 | 12:49 PM
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richardlo's Avatar
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2019 c300
running rich effects

So my car has been running rich for the last few thousand miles. Took it to my mechanic but he kind of informed me that it would take a while to check out and usually I dont have the time to leave it there all day to pinpoint.
Drivability has been fine.
Just curious what bad side effects can result from running rich except for lower gas mileage?
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Old Dec 22, 2009 | 01:19 PM
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From: Corona, CA
03 g35 coupe...........02 c32 Sold
running rich will kill your oem cats. OEM cats are outrageously over priced.
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Old Dec 22, 2009 | 05:33 PM
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
No good for Cats or O2 sensors.
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Old Dec 22, 2009 | 08:34 PM
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Preet's Avatar
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From: Canada, Ontario, Brampton
E63 AMG W211 & W203 Sport Pkg
How can you tell if the car is running rich?
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Old Dec 23, 2009 | 03:31 PM
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2019 c300
For me I got a code of po172 my mechanic mentioned it after hooking it up to the mercedes computer thing they do.
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Old Dec 26, 2009 | 05:04 AM
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if you are running rich you probably need to replace your o2 sensors, check spark plug gap and make sure you have no fouled plugs, check your ignition coils and then make sure there is no obstructions in your air intake (change the filter) and then a throttle reset might help to...

probably a safe bet to say your o2 sensors are old though and need to be replaced... this is how your computer checks to make sure you are at optimal air fuel ratio and then balances it.
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