Rough idle
Thread Starter
Senior Member
Joined: Apr 2004
Posts: 393
Likes: 2
From: Mesa, AZ
2011 E350 Bluetec, 1996 S320 & 2006 E320 CDI Sold to my son & 2017 GMC 2500 Diesel Pick up
Rough idle
my 2006 E320 CDI with 83K miles, started having a rough idle at cold start. Once warmed up it smooths out. I changed the air filter, Oil & filter and fuel filter. It still seems the same. It is throughing no codes,Any ideas? I was thinking maybe something like the egr but don't know how to check it and they cost to much to change it just to check.
Super Member
Joined: May 2009
Posts: 673
Likes: 27
From: Frederick
2000 ML320, 2005 E320 CDI
Crawl under the car and look to see if there is rust color fluid anywhere. Mine was dried. It was hydraulic fluid from the left motor mount. Rough idle as stated above could be anything, but see if it's a mount. I have a 2005 and mine just went.
Also, a bad glow plug could happen without throwing a code immediately. Mine was tested bad at the dealer a few weeks before I got a CEL. I had already ordered the set from Autohausaz and got it a few days after the code popped.
Also, a bad glow plug could happen without throwing a code immediately. Mine was tested bad at the dealer a few weeks before I got a CEL. I had already ordered the set from Autohausaz and got it a few days after the code popped.
Thread Starter
Senior Member
Joined: Apr 2004
Posts: 393
Likes: 2
From: Mesa, AZ
2011 E350 Bluetec, 1996 S320 & 2006 E320 CDI Sold to my son & 2017 GMC 2500 Diesel Pick up
Thanks for the suggestions, I’ll check the mounts and just keep checking things. LOL first time I wish there was a code popping up…
Thread Starter
Senior Member
Joined: Apr 2004
Posts: 393
Likes: 2
From: Mesa, AZ
2011 E350 Bluetec, 1996 S320 & 2006 E320 CDI Sold to my son & 2017 GMC 2500 Diesel Pick up
Crawl under the car and look to see if there is rust color fluid anywhere. Mine was dried. It was hydraulic fluid from the left motor mount. Rough idle as stated above could be anything, but see if it's a mount. I have a 2005 and mine just went.
Also, a bad glow plug could happen without throwing a code immediately. Mine was tested bad at the dealer a few weeks before I got a CEL. I had already ordered the set from Autohausaz and got it a few days after the code popped.
Also, a bad glow plug could happen without throwing a code immediately. Mine was tested bad at the dealer a few weeks before I got a CEL. I had already ordered the set from Autohausaz and got it a few days after the code popped.
