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      03-06-2012, 03:49 PM   #124

Drives: JB 335i-M3
Join Date: Feb 2010
Location: Simi Valley

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2008 BMW 335i  [4.50]
Originally Posted by andy92782 View Post
It's frustrating that the engine is clearly misfiring and yet no codes are stored. I'm sure it's like you say where only severe, sustained misfiring is enough to trigger a code.

What I'd like to know is whether or not misfires are logged in the ECU despite not triggering a CEL or storing a code. I'd think this could at least point us in the right direction or maybe narrow down a particular cylinder.

Has anyone ever tried running Techron or some other fuel injector cleaner just to see if it makes a difference?
i tried the Techron cleaner 12oz bottle on a full tank, it didnt really make a difference.

I replaced my plugs with OEM ones from the dealer, i just dont understand why plugs would trigger this, i replaced them at 54k miles.