Erratic Idle M112 Engine - Page 2

Apr 14, 2014 | 05:41 PM

#26

ordway.dc

Thread Starter

Junior Member

Joined: Oct 2013

Posts: 25

Likes: 4

2005 C240, 2001 ML320

In case you are wondering... I bought my EGR Valve on Amazon. It was the exact same brand as OEM.

http://www.amazon.com/gp/product/B001DCEV2C/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

Apr 25, 2014 | 10:24 PM

#27

rolaes62

Member

Joined: Feb 2008

Posts: 75

Likes: 3

From: Chandler, AZ

2001 C320, 1997 E320, 1993 300e & 2005 F150 Supercrew

Quote:

Originally Posted by ordway.dc

This problem has been solved.
I purchased a new EGR valve and found that it does not allow vacuum across the valve with no power on the plug. So I installed the new EGR valve, cleared the codes, and all is well.

In addition I have a clean MAF, Clean TB, New Breather Hoses, New MAF Seals, and a New Crank Position sensor. Should be good for a while now!
In all, I don't think I spent a lot solving this. Most of the stuff I did would be considered extended maintenance. In other words, all of that stuff needs replacing when your car is approaching 100K miles as mine is.

Also, I wanted to thank everyone who helped me solve this problem; especially tikara, samaritrey, moviela, quadcammer, blzdout, and 2subway.

Great Job with your troubleshooting Ordway, my C320 is acting the same way and I too was suspecting my EGR. I'll try your test you did. Do you know if its possible to just clean out the valve? I did that to my sons E320 and it seem to resolve the issue with his, or do you recommend just replacing it?

Apr 26, 2014 | 08:14 PM

#28

ordway.dc

Thread Starter

Junior Member

Joined: Oct 2013

Posts: 25

Likes: 4

2005 C240, 2001 ML320

The quickest way to toubleshoot this is to remove tube b as shown in in post 19. If the car runs normally with that tube off, then I would replace the EGR valve. In my case it was the Valve Y31/1 that failed. I doubt cleaning would fix that, but you could try.

Mar 20, 2017 | 01:42 AM

#29

fourstroke

Newbie

Joined: Mar 2017

Posts: 9

Likes: 2

From: Maryland

2009 E350 4Matic wagon (his), 2005 E320 4Matic wagon (hers)

Thank you.

Quote:

Originally Posted by ordway.dc

I'm a new member on this board. What finally motivated me to join was my need to thank you, ordway.dc, for your exhaustive work in tracking down the erratic idle issue on your M112. You gave me the solution to my identical problem on my M112. I also replaced and cleaned everything you did in my attempt to fix this issue, except for the CPS. Dismayed by my failure, I go online, find this thread, pull "tube b," and boom. Idle is smoother than it has ever been. A new EGR valve is arriving at my door tomorrow.

Thank you, again.

-fourstroke

Reply Subscribe