w210 e55 Being slugish - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 09-06-2011, 06:36 PM Thread Starter
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w210 e55 Being slugish

Hi i was wondering if my o2 sensors are going bad. No check engine light. Ive noticed that my car is very slow at times. I ran my buddy with a cobalt ss and he beat me on the highway 60-125. So i did some reading so i disconnected the battery for 30min and unplugged the two front o2 sensors and now it runs like a rapped ape. I ran him again and rapped him. Could my o2 be bad. And also what can i do for more power. Will a chip help and res and second cats delete help.
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post #2 of 10 (permalink) Old 09-06-2011, 06:53 PM
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Mileage? Service history? Work with us a little.

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post #3 of 10 (permalink) Old 09-06-2011, 07:07 PM Thread Starter
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105k just bought the car about 5 weeks ago. Have car fax with all service reports till 92k. Since i bought it i changed the plugs and cleaned the throttle body and installed 2 k&n air filters and removed the screen from the airbox.
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post #4 of 10 (permalink) Old 09-06-2011, 07:21 PM
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What about wires, how do they look? Also, were the K&Ns E55-specific or generic?

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post #5 of 10 (permalink) Old 09-06-2011, 07:36 PM Thread Starter
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the filters are for that car and i did wires when i did the plugs. i just herd of someone els that there o2 sensors went bad and i did what they said they did and it runs way better and i took a drive to wildwood nj sat and on the way home i was getting 29.2 mpg @ 64 mph.
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post #6 of 10 (permalink) Old 09-06-2011, 09:38 PM
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Try the AMG forum, I can't imagine all of your O2 sensors failing at once, especially with no codes.

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post #7 of 10 (permalink) Old 09-07-2011, 09:33 AM
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Bad O2 sensor(s) would almost certainly trip a CEL. As suggested, find the W210 AMG forum and ask the guys there. Also see if you can pull any pending codes.

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post #8 of 10 (permalink) Old 09-07-2011, 09:36 AM
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Bad O2 sensor(s) would almost certainly trip a CEL. As suggested, find the W210 AMG forum and ask the guys there. Also see if you can pull any pending codes.
Not always, I just posted on the sister thread to this one.

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post #9 of 10 (permalink) Old 09-07-2011, 09:40 AM
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Not always, I just posted on the sister thread to this one.
Thanks Shaun, I just saw that!

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post #10 of 10 (permalink) Old 09-07-2011, 10:04 AM
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If I read the post correctly, the OP found the secret for gas mileage higher than MB's specs, better acceleration, and faster speed.
Disconnect battery for 30 minutes, unplug the front O2 sensors, rape cobalt ss. No CEL.

But play safe. Wait until a few more E55 owners confirm the above before doing it to your car.

Last edited by mbvis; 09-07-2011 at 10:06 AM.
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