Quote:
Originally Posted by SilverSlug
Fuel injectors and coil packs don't have to be replaced unless they fail, which I understand is the same for O2 sensors (since they would throw up a CEL code if they failed).
However, I wonder if there is a threshold where these components work well enough to to avoid getting a CEL code, yet struggling to perform as they should.
That being said, you should definitely drive your car the way it was meant to be driven (way above 3.5k RPM). The higher revs will keep the injectors clean and burn out carbon build up.
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Yeah, that's been my experience with injectors and coils as well, though I've had O2 sensors get lazy on a prior car (not a BMW though) without throwing codes so hard to say for sure. I imagine the other engine sensors for this car are more sophisticated and so would probably throw a code if something was off, but I too wonder about that threshold.
And I am aware that revving the car keeps things cleaned out ("Italian tune up") and I do try to rev it out when I can, but around here in the burbs, doing that on many roads will quickly get you in license purgatory. Lots of patrol cars around. That said, when I replaced my TA 2 weeks ago, I opened the throttle butterflies and looked down into the valves and they looked extremely clean. Obviously couldn't see all of them, but hopefully that meant that things are in fairly good shape.