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 , 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.