Misfire to Borken valve spring

[hypnoticautopsy]

Has anyone with a 2011 535xi ever experienced a broken valve spring, or to that matter any N55 engine?

So I brought my 2011 F10 with 120k on the dash in after suddenly getting the drive train malfunction indicator... had the vehicle scanned by an indy BMW / EURO shop, they said misfire C3. Brought it to the dealer, they say misfire C2, and that I need new injectors, for bank 2, and a coil for C3. After a week now, my SA calls and says now I need a new valve spring cause that is what caused the misfire... a broken valve spring on C4.?? I'm at a loss here, for the life of me, I can't understand how I go from a misfire in C3, to a broken valve spring in C4.

I think this is unheard of... I've googled and googled to no avail trying to find issues as such, and have come up empty. I've never heard of a valve spring breaking on the N55... for that matter I've driven a 93 Ford Escort to 585k one motor no valve or piston issues... and that was in the late 90's, surely this motor is better built than that old Ford 4 banger..

[Pelican Parts]

I've never heard of come across this before. I know that there was a slight possibility of this happening to older BMWs; but definitely not to newer motors. It seems like either the indie shop or dealership has some issue - the fact that they read a misfire code in cylinder 3 then another place read it on cylinder 2 and then another issue....take it to another shop and get a 3rd opinion. Maybe borrow or get a reader/scanner yourself and see what stored codes you pull. Just my 2 cents, best of luck!

[White94RX]

I have never seen a broken valve spring on an N55. That doesn't mean that it can't happen though.

[Stück]

I've diagnosed, seen and repaired several N54's with springs that broke for no apparent reason. Haven't seen it happen to a N55 as of yet, but they are a considerably younger engine still.

[White94RX]

That's surprising. I've literally only ever seen 3 broken springs in 12 years in the business. 2 on S65, 1 on S85. I just figured it was a flaw in that motor being that the two engines are nearly identical, minus 2 cylinders


Sent from my iPhone using Tapatalk