W211 AMG Discuss the W211 AMG's such as the E55 and the E63
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Primary De-CAT

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Old 08-15-2012, 01:36 PM
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CL55-AMG
Primary De-CAT

I really need some help guys. I was advised to do a Primary CAT delete and fit 200 cell sports secondaries to increase performance, but I cannot get rid of the EML alarm even tho we moved the Lamdas passed the secondaries. Has the extra length of wire upset the system that much? I'm massively down on power and now running very rich, so the sensors are definitely screwed. And yet it passed the UK emissions test with flying colours, I don't get it. Please help as I'm struggling to find a solution.
I'm thinking of putting everything back as it was
Old 08-15-2012, 02:56 PM
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2003 W211 E55, 2003 W220 S600
extending 02 sensor wires can do that.
Old 08-15-2012, 03:11 PM
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I can't be the only one who has done this, what's the fix?
Old 08-15-2012, 03:22 PM
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2004 E55K AMG Wagon
Have the rear 02 sensors disabled with Star
Old 08-15-2012, 04:35 PM
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Originally Posted by SavMan
Have the rear 02 sensors disabled with Star
I know we've discussed this before, but is this definitely possible? and if so will it allow the engine to run at max performance?
can you recommend anyone?
Old 08-15-2012, 05:15 PM
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2004 E55K AMG Wagon
You need Star Developer which not all Indie's have and it is possible to completely screw your ECU so make sure they have done it before. Speak with the guys who did your map they shoukd be able to do it, mine was done by West Tuning or you could speak with Acid at MSL if you need there numbers I can PM them to you.
Old 08-15-2012, 06:41 PM
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CL55-AMG
Originally Posted by SavMan
You need Star Developer which not all Indie's have and it is possible to completely screw your ECU so make sure they have done it before. Speak with the guys who did your map they shoukd be able to do it, mine was done by West Tuning or you could speak with Acid at MSL if you need there numbers I can PM them to you.
PM sent
Old 08-15-2012, 06:43 PM
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Just get some Kleemanns
Old 08-15-2012, 07:30 PM
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Originally Posted by AKnight55
Just get some Kleemanns
Great suggestion, but you need to be more specific.
Do Kleemanns do a Primary De-CAT system?
If so how do they cope will the alarms?

or

should you NEVER remove the Primary CATS under any circumstances and leave the sensors where they are or you get the problems I'm encountering with no true solution
Old 08-15-2012, 07:51 PM
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Originally Posted by RichN2O
Great suggestion, but you need to be more specific.
Do Kleemanns do a Primary De-CAT system?
If so how do they cope will the alarms?

or

should you NEVER remove the Primary CATS under any circumstances and leave the sensors where they are or you get the problems I'm encountering with no true solution
Kleemann headers are a mid length header.. They come with a downpipe, which is in place of the primaries (so the primaries are deleted).. I believe kleemann will clear the codes for you free of charge.

These headers also make good power for the price
Old 08-15-2012, 08:02 PM
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Originally Posted by AKnight55
Kleemann headers are a mid length header.. They come with a downpipe, which is in place of the primaries (so the primaries are deleted).. I believe kleemann will clear the codes for you free of charge.
These headers also make good power for the price
Now this sounds promising
From what you are saying the errors can definitely be removed. But I would still like to understand the function of the secondary sensors. Why Has the error code from my sensors caused the engine to run rich and consequently caused massive power reduction as seen on the dyno today ???? If its part of the management system and aids with the AFR's, how will the engine know what to do if they are mapped out or am I being thick?
Old 08-15-2012, 09:48 PM
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Your issues is 95% related to the cut O2 wires.
The car is running poorly because you reconnected faulty sensors.

The cel can be easily shut off by those professionals that have experience with such things.
IE tuners like Kleeman.
There are some other fixes that are hard ware, and not software...but those required O2 sensors that are functioning within OEM spec.

Get the sensor shut of electronically and call it a day.
Old 08-15-2012, 09:55 PM
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Kleenann headers ftw
Old 08-16-2012, 04:42 AM
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Originally Posted by Worth the wait
Your issues is 95% related to the cut O2 wires.
The car is running poorly because you reconnected faulty sensors.

The cel can be easily shut off by those professionals that have experience with such things.
IE tuners like Kleeman.
There are some other fixes that are hard ware, and not software...but those required O2 sensors that are functioning within OEM spec.
Get the sensor shut of electronically and call it a day.
The sensors were fine before they were moved, however the general feeling is that extending the wires has altered the resistance.
I am currently awaiting a call back from Kleemann UK
Old 08-16-2012, 05:08 AM
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Originally Posted by RichN2O
The sensors were fine before they were moved, however the general feeling is that extending the wires has altered the resistance.
I am currently awaiting a call back from Kleemann UK
Speak with Steen at Kleemann UK,
Old 08-16-2012, 07:43 AM
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As above, Acid should be able to do this for you, minimal effort using STAR
Old 08-16-2012, 09:38 AM
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Originally Posted by RichN2O
The sensors were fine before they were moved, however the general feeling is that extending the wires has altered the resistance.
I am currently awaiting a call back from Kleemann UK

Well I consider the sensors and the wires as one unit, hence my comment that the sensors were not within spec..as in the don't work right.

Hope you get it resolved with minimal effort

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