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      09-18-2012, 09:23 PM   #1

Drives: 2011 335 M-Sport Sedan-x-drive
Join Date: Sep 2012
Location: United States

iTrader: (0)

N55 Cold Start Issues

I have a 2011 335 that I got in February of this year. After a month or so of my purchase, I noticed heavy knocking of the engine after a particularly cold night. After the engine warmed up the knocking disappeared.

Codes read as a misfire and the dealer replaced the spark plug and injector in one of the cylinders.

The other day I experienced the same knocking after a cold night. Has anyone had this issue before? Is it a much larger problem that than just injectors and plugs?

Another anomaly maybe pertinent to the issues is a weird sound that almost sounds like a belt slipping on start up. It is extremely loud. I can't really describe it but it probably happens like 1 in 20 starts.

Any help would be awesome.

Last edited by kogulan997; 09-19-2012 at 09:50 AM.