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      05-17-2012, 07:29 PM   #10
Freight Dawg
e90pilot's Avatar

Drives: E90 325i
Join Date: Jul 2005
Location: Oakland, CA

iTrader: (3)

Another experiment. Let it idle in neutral and with your window down, give the throttle a really sharp stab to rev it a bit. Do you hear a "gasp" from the engine? If you're in a manual car, slow the car down in second gear and but the clutch in at about 1200rpm. Do the revs come up before they go down?

My car does this once every few months randomly. My guess is that some non-critical sensor isn't being read. And it goes away on the next start.
'06 Arctic Metallic 325i | Sport Package | 6MT | Dinan Stage III suspension | Dinan exhaust | 330i manifold swap! Click here! | Active Autowerke tune | 135i Brake Calipers | Deiselboost caliper brackets | E46 M3 front rotors