EGR Valve Disable

muzam321

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Hi,
I wanted to get some neutral advice/feedback regarding EGR disable.
I have a 350 CDI and have become interested in getting it tuned and was wondering if there are any negatives or issues I should be aware of when disabling the EGR valve.
Everything I have read seems like its a no brainer to get it disabled but there must be a catch right....??????
Any advice would be greatly appreciated.
Thanks
 

Carabosse

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It would also be interesting to hear what problems, in practice, are caused by NOT disabling the EGR.

When I say "in practice", I mean what are your personal experiences, not what are the theoretical disadvantages.
 

duncanh

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It would also be interesting to hear what problems, in practice, are caused by NOT disabling the EGR.

When I say "in practice", I mean what are your personal experiences, not what are the theoretical disadvantages.

I had my EGR and inlet manifold cleaned out at 270K miles. The car was running poorly, sluggish and emitting a trail of smoke.

The EGR was not sticking, it was operating normally, but the route through the EGR and the manifold were heavily restricted by thick black sooty gunge.

The difference after it was cleaned out was astonishing. I had forgotten how good it used to be.

The smoke has gone, no problems with emissions (now at 304K miles).
 

Carabosse

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I had my EGR and inlet manifold cleaned out at 270K miles.

Thanks Duncan. :)

(I cannot imagine my keeping any car beyond about 50k miles or so.)
 

GAD Tuning LTD

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Good morning,

Inlet manifolds on the 3.0d BMW engines are prone to cracking through the build up of carbon. Main benefits of EGR disable is not necessarily power gain but throttle response and of course allowing your vehicle to run on what it needs (Cooler clean air)

Regards

Anthony @ GAD
 
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muzam321

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Thanks Duncan, thats interesting but again, I don't plan to get anywhere that mileage.

Anthony, would you say there are any negative points to the EGR disable?

I am also assuming that the remap methods you use and/or the EGR disable will invalidate the Mercedes warranty?
Also where does this leave a car with regards to MOT if EGR and DPF have been deleted/removed?

Thanks
 

Carabosse

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On the warranty, the manufacturer has to prove that the modification caused whatever problem you wish to have fixed under warranty.

It is a common misconception that a warranty is like insurance and that a modification which has not been declared will invalidate the entire warranty.
 

GAD Tuning LTD

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Good morning,

Sorry for the late reply having internet connection issues at the office!!!

Disabling the EGR valve is through software modification and also we don't completely stop the movement of the valve so if an actuation test is performed it will still show movement. Having your engine run on cooler cleaner air improves the life of the turbo and stops the manifold from blocking.

As far as the remap goes main dealers cant detect the software changes due to everything being bespoke we take your factory file and modify that keeping your hardware numbers, software numbers and software update numbers.

As far as warranty goes Carabosse is correct, they have to use the block exemption rules meaning they can only void the warranty of a part that is directly caused by the remap (if they find it) and also they still have to prove it.

Regards

Anthony @ GAD
 

duncanh

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would you say there are any negative points to the EGR disable?

Mine has been disabled for about 25K miles.

The only one I have noticed is a longer time for the engine to warm up. It is not really noticeable in this weather, but it was noticeable in the winter.

I have a long daily commute, so it hardly matters, but for anyone doing short runs (less than 5 - 10 miles) the engine may not get up to full operating temperature.

I had no problems at MOT time.
 
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