Submitted: Sunday, Feb 05, 2012 at 09:42
ThreadID: 91672 Views:9405 Replies:3 FollowUps:1
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G.day all
my mate did a valve adjustment on the cruiser,this motor has 260k's on it,the gunk build up in the crossover pipe between the egr valve and inlet manifold was unbelieveable,10mm of a black sludge around the entire pipe,resricting air flow,and bits of this gunk could end up in motor,pipe cleaned,egr blanked off both ends, motor runs much smoother and better acceleration.

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Reply By: Patrol22 - Sunday, Feb 05, 2012 at 10:36

Sunday, Feb 05, 2012 at 10:36
This build up post the EGR valve is a common problem/issue with all engine that have this emission control system (which is nowadays pretty much all engines). If you go to the various forums you will find that lots of folks are fitting EGR blanking plates to try and stop this build-up. Not entirely legal mind you as it is "interfering" with emission control but it sure does work. I have fitted a thin piece of high grade stainless steel to blank the EGR in my D40 and it seems to be doing the trick for me.

I have heard of cases where lesser quality plates have deteriorated and a hole has blown through but don't have first hand experience of this. I also believe that the ECU on some of the more recent common rail diesels will sense when the EGR is blocked and go into limp mode. With the cruiser it might be worthwhile going onto LCOOL forum and do a search.
AnswerID: 476959

Follow Up By: Holiday Maker - Sunday, Feb 05, 2012 at 16:57

Sunday, Feb 05, 2012 at 16:57
This is very true.

The mercedes Benz UK Owners site http//forums.mercedesclub.org.uk/index.php have a very good thread on cleaning the EGR and making a "electonic shunt" to fit into the ECU that "tricks" the ECU into thing that the EGR Valve is still operational.

The shunt disconnects the EGR but still gives a reading for the MAF.

Wynn's have a product available to the trade for approx $45 that you spay into the EGR and manifold that cleans all that "gunk" out. Also with the cleaning spray there should be a black bottle of "injector cleaner." This is a much stronger version that is available in retail outlets and is well worth the $45 by itself.

The service centre I go to, put me onto the Wynn's product and got some for me.


FollowupID: 752181

Reply By: Rockape - Sunday, Feb 05, 2012 at 17:39

Sunday, Feb 05, 2012 at 17:39
4.5 V8 diesel engine at around 20,000 Km. This engine had done around 20,000 km but the hours and revs it worked would have worked out about 90,000 km.

This is what the intake manifold looked like.

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AnswerID: 477019

Reply By: Member - Phil G (SA) - Sunday, Feb 05, 2012 at 20:11

Sunday, Feb 05, 2012 at 20:11
Yep, happens to all diesels with EGR. I corrected the problem with my Landcruiser 7 years ago and its been great since. Have a look HERE to see what you need to do to a HDJ78/79/100 series. My advice is to disable the EGr asap to prevent further carbon buildup.

Now we also have a VW - same problem but more complex electronics - the VW enthusiasts are keen on catch cans so that it ends up as dry carbon rather than oily carbon in the intake.
AnswerID: 477035

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