I have a bit of rough idle at start up. I have placed new plugs (Bosch Iridium) car runs fine once it warms up. I have put in cleaner additive, but still rough idle at start up for about 5-mins before it seems to get better. One suggestion was fuel pump sensor???? No diag codes??? Thanks for your time!
Some rough idle in park/ start up on 2003 Mercedes-Benz S55 AMG
by mlcooper411 in Columbia, SC on February 27, 2012
ANSWER by chinasinoy on February 28, 2012
There are some causes of rough idling. You can visit here to see the detailing instruction http://goo.gl/vw97a There tells car rough idle causes and how to fix it clearly. So I'm not repeat here. Good luck and best regards.