Quote:
Originally Posted by DaanBMW
imagine you step on the gas pedal to take off. you can imagine that what happens is the rpms go continually up until you feel the engine is revving so high that you should shift to 2nd. so basically the graph would be a continuously rising curve rpm = f(time).
mine would basically be a v. v. brief rpm rise, then a dip - a bog down, feels like a hesitation as it I suddenly took my foot off the gas but I didn't - after which the rpms finally continue the rise expected by the order via the gas pedal. so curve would be a Z shape: up - down - up again.
rumble ? not sure i'd call it that, it is a severe and short dip in rpms that if it would last would kill the engine (it never does).
misfire ? likely not, as a misfire would likely getting more pronounced at high loads/speeds, which never happen.
idling is steady, no dips, no chasing.
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Oddly enough, mine is doing this too, and only below 4000rpm.
Changed valvecover, vanos solenoids, sparkplugs, valvetronic sensor, and I have a AIT (but might use my MAF again, and changed the manifold pressure sensor.
I'm a a loss.