Is EGR intake before or after DPF

Daddyoftwo

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A207 e350d 2012
Hi
I bought an e350d cabriolet a few months ago on a 12 plate, 81k miles. Whereas it has service history, from speaking to the previous owner he isn't a petrol (or diesel head) and will have only done the most basic maintenance.
I'm keen on keeping my keeping my cars for several years and well maintained, including preventative items.
I previously had an X type Jag 2.2d which was a fantastic car but did have problems with the egr clogging up.
I understand that this can also be a problem with the om642 but this mainly seems to be earlier ones from an internet search.
What I was wondering is whether the egr intake on mine is before or after the dpf? (Apparently all euro VI cars have a low pressure egr with the inlet after the dpf but mine is only an euro V) .
If it's after the dpf - then does this mean that that egr is less likely to get clogged up. Or would it still be a good idea to get it cleaned?
There's no warning lights, etc and seems to be going okay although the thermostat was broken (rubber seal had perished) so it was running too cold for don't know how long, so presumably producing too much soot. (Although Local Merc indy who replaced thermostat said dpf wasn't clogged up and will now clean on next regeneration).
 

Dean Fletcher

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Mercedes E400
Hi
I bought an e350d cabriolet a few months ago on a 12 plate, 81k miles. Whereas it has service history, from speaking to the previous owner he isn't a petrol (or diesel head) and will have only done the most basic maintenance.
I'm keen on keeping my keeping my cars for several years and well maintained, including preventative items.
I previously had an X type Jag 2.2d which was a fantastic car but did have problems with the egr clogging up.
I understand that this can also be a problem with the om642 but this mainly seems to be earlier ones from an internet search.
What I was wondering is whether the egr intake on mine is before or after the dpf? (Apparently all euro VI cars have a low pressure egr with the inlet after the dpf but mine is only an euro V) .
If it's after the dpf - then does this mean that that egr is less likely to get clogged up. Or would it still be a good idea to get it cleaned?
There's no warning lights, etc and seems to be going okay although the thermostat was broken (rubber seal had perished) so it was running too cold for don't know how long, so presumably producing too much soot. (Although Local Merc indy who replaced thermostat said dpf wasn't clogged up and will now clean on next regeneration).
I could be wrong. But I believe its before the DPF.
 
OP
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Daddyoftwo

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Hi Dean

Many thanks for the quick reply.

Is there anyway to know if it is getting clogged up - and if so chuck some Wynns down the inlet manifold, or if take it off and clean it. Or do I adopt the "if it ain't broke - don't fix it" attitude and just wait for the Engine Management Light to come on and the OBD code saying it's blocked. (In my old Jag by the time that came on - it was time to shell out for a new one, so preventative cleaning was a shrewd move).

Am I likely to be living on borrowed time with this EGR at 81,000 miles / 8 years??

(I'm guessing that lots of people get them blanked off. But I understand that this isn't legal, and the only real way is through a remap).
 

Dean Fletcher

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Hi Dean

Many thanks for the quick reply.

Is there anyway to know if it is getting clogged up - and if so chuck some Wynns down the inlet manifold, or if take it off and clean it. Or do I adopt the "if it ain't broke - don't fix it" attitude and just wait for the Engine Management Light to come on and the OBD code saying it's blocked. (In my old Jag by the time that came on - it was time to shell out for a new one, so preventative cleaning was a shrewd move).

Am I likely to be living on borrowed time with this EGR at 81,000 miles / 8 years??

(I'm guessing that lots of people get them blanked off. But I understand that this isn't legal, and the only real way is through a remap).
I'm sort of on the attitude of if it ain't broke don't fix it. My cars a 2009 and done 135k and never had any issues with the egr. Mercedes seem to have sensors for everything. You might notice a rough idle when things start to go bad. You could alway opt for a manifold clean job as you say which couldn't hurt.
 

sonic

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I have a E350CDI 2011 with 58K miles, never had any problems. I wouldn't expect you 12 plate with 81K miles to have any problems. Its the short journeys that cause the problems, I rarely do less than 20 miles on a journey.
 
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Daddyoftwo

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Cheers. It has been getting a few short journeys with me lately.

But I leave it alone.

Many thanks for your advice. Very much appreciated.
 


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