bad idle after swap, no vacuum leak?
Thread Starter
MBWorld Fanatic!
Joined: Dec 2007
Posts: 1,100
Likes: 0
From: Rochester, MN
sounds like airplane
bad idle after swap, no vacuum leak?
I spent the better part of this morning messing with my car. mapped a new maf scaling file with my split second software and got to do a couple hard pulls. It's on the rich side in general right now, but that's good!
The 5 liter is running well and it makes proper boost etc.
I cannot get it to idle smoothly! It idles like there is a vacuum leak, but there doesn't seem to be one.
Ideas?
The 5 liter is running well and it makes proper boost etc.
I cannot get it to idle smoothly! It idles like there is a vacuum leak, but there doesn't seem to be one.
Ideas?
Senior Member
Joined: Mar 2008
Posts: 263
Likes: 0
Dynocomped C43K, 08 X5
Map sensor going south? or is the ecu fully adapted after the reset? ecu need sometime to re-learn the throttle position (my 43 needs about 10miles to fully learn the throttle). I dunno but maybe you need bigger injector or fuel pump with 5.0!
MBWorld Fanatic!
Joined: Apr 2006
Posts: 1,101
Likes: 40
From: Bay Area, CA
98 C43, 15 Alfa 4C LE, 18 Tesla Model 3 DM Perf, 08 Duc S1000, 02 Duc 998, 98 Duc 748, 01 Miata
I wonder if you're seeing the same issue as Saaboteur.
https://mbworld.org/forums/c36-amg-c...-paint-29.html
https://mbworld.org/forums/c36-amg-c...-paint-29.html
MBWorld Fanatic!
Joined: Apr 2010
Posts: 4,437
Likes: 43
From: PDX
1999 C43, 2008 P30 E63, 2014 SQ5, 2024 Model Y Performance
Here are a number of threads I have found that are about a rough idle:
https://mbworld.org/forums/c36-amg-c...g-problem.html
https://mbworld.org/forums/c36-amg-c...em-idle-d.html
http://fourms.mbworld.org/forums/c36...ough-idle.html
http://m.www.mbworld.org/forums/showthread.php?t=324410
Hope these help. If you do it get it figured out make sure you post the solution so others can learn
https://mbworld.org/forums/c36-amg-c...g-problem.html
https://mbworld.org/forums/c36-amg-c...em-idle-d.html
http://fourms.mbworld.org/forums/c36...ough-idle.html
http://m.www.mbworld.org/forums/showthread.php?t=324410
Hope these help. If you do it get it figured out make sure you post the solution so others can learn
Thread Starter
MBWorld Fanatic!
Joined: Dec 2007
Posts: 1,100
Likes: 0
From: Rochester, MN
sounds like airplane
I do not have stock fuel pump/fuel lines etc.
I have done some further maf tuning and reset the computer once and the problem seems to have largely gone away. I do still have slightly imperfect idle, but nothing like it was.
If it gets worse again I'll swap the full the TB over from the other motor in my garage (don't know why I hadn't thought of that yet).
I have done some further maf tuning and reset the computer once and the problem seems to have largely gone away. I do still have slightly imperfect idle, but nothing like it was.
If it gets worse again I'll swap the full the TB over from the other motor in my garage (don't know why I hadn't thought of that yet).
