slow acceleration problem....o2 sensors? - Page 4 - Mercedes-Benz Forum
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post #31 of 38 (permalink) Old 09-05-2009, 04:31 PM
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You might have a bad cat holding you back..

You might have a bad cat holding you back, if everything else get's swapped out..
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post #32 of 38 (permalink) Old 09-05-2009, 10:24 PM
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Originally Posted by fabbrisd1 View Post
You might have a bad cat holding you back, if everything else get's swapped out..
Well if cats were a problem than power would not be restored after a reset would it?
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post #33 of 38 (permalink) Old 09-11-2009, 10:37 AM
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You have mentioned a -100bhp reduction in power, that kindof power loos can only come as a result of serious restriction in-or-out.

Normally, a soft reset restores the factory defaults, and then the factory defaults degrade over drive time, but 4-6 weeks is not uncommon before even a hep owner "feels" the need to do another soft reset to get the zip back.

However, degrading the factory defaults that result in a - 100bhp loss, something has to be very wrong - wouldn't be the fuel supply, or the soft reset wouldn't improve fuel pressure loss, the only thing it possibly could be in my mind is a major cat problem - if the soft reset restores the defaults, then the resstrictive cat cause the 02 sensors to lean everything back down (and fast).

I have not had any cat problems whatsoever, so I am not hep on that backend issue - but yes, could be the cause of the major performance loss you describe.
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post #34 of 38 (permalink) Old 09-11-2009, 03:58 PM
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Quote:
Originally Posted by fabbrisd1 View Post
You have mentioned a -100bhp reduction in power, that kindof power loos can only come as a result of serious restriction in-or-out.

Normally, a soft reset restores the factory defaults, and then the factory defaults degrade over drive time, but 4-6 weeks is not uncommon before even a hep owner "feels" the need to do another soft reset to get the zip back.

However, degrading the factory defaults that result in a - 100bhp loss, something has to be very wrong - wouldn't be the fuel supply, or the soft reset wouldn't improve fuel pressure loss, the only thing it possibly could be in my mind is a major cat problem - if the soft reset restores the defaults, then the resstrictive cat cause the 02 sensors to lean everything back down (and fast).

I have not had any cat problems whatsoever, so I am not hep on that backend issue - but yes, could be the cause of the major performance loss you describe.
Well my thinking is that if the cats were clogged: restriction after a reset would no go away so power loss would be immediate not gradual
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post #35 of 38 (permalink) Old 07-13-2017, 04:02 AM
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i have the same problem. sometimes the car gives really powerful acceleration but sometimes it's not that much powerful. what is the actual problem?
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post #36 of 38 (permalink) Old 03-19-2019, 10:46 PM
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Hi guys,

Same sort of issues. I’ve taken a video of before and after my hard reset to show the difference in acceleration but I don’t know how to post them here.

Would appreciate any advice as well thanks.

Steven
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post #37 of 38 (permalink) Old 04-01-2019, 01:58 PM
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Just a consideration, but is it possible you have a EVAP/vacuum leak? Have you had a smoke leak test performed?

I ask this because I purchased a new to me 2000 E55 last summer. The car kept on having CEL codes P0170 and P0173. I replaced many, many parts. MAF, spark plugs, breather hoses, vacuum lines, gasket between throttle body and intake manifold, O2 sensors. After all those parts and still getting codes, I took it to a great mechanic with a smoke leak test machine. He hooked it up and you could see faint smoke coming out of the sides of the engine as he pumped smoke into the intake from the MAF. The problem was the gaskets between the intake manifold and the heads were leaking. Replaced the gaskets and no more engine codes. The car ran much better because it could control the fuel trim within parameters.

I don't feel the parts a replaced were a complete waste. I didn't know the history of the car so I consider it maintenance

Best of luck with solving your issue.
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post #38 of 38 (permalink) Old 04-06-2019, 11:51 AM
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Hi Fellas, Razor1, Stevenkrash, Fotoflame,

You do realize the last active post was over 9 years ago.....
Best for you to start a new thread and refer to this old one.
As well, post in the w210 thread may get you a faster response.
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