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Mr Fixit View Drop Down
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    Posted: 24-January-2012 at 10:42
I have an E46 M3 and that seems to lack urgency over 6000 rpm. Continies to rev Ok but does not seem to generate much more power;- Ideas Confused
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UweM3 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote UweM3 Quote  Post ReplyReply Direct Link To This Post Posted: 26-January-2012 at 17:48
-- plug diagnostic in and read fault codes

-- stick it on a rolling road to see where the power drops off.
E61 520d, slow and buzzy but my wallet likes the mpg.....
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Andrew Rolland View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Andrew Rolland Quote  Post ReplyReply Direct Link To This Post Posted: 26-January-2012 at 21:38
If no fault codes are logged it could just be a drop off in performance from dirty/worn bits like spark plugs, fuel injectors, air flow sensor, engine breather hoses.  None of these will drop a fault code if dirty until they get to a certain level but performance could be down by then.
 
One word of warning re-rolling roads.  Your car is relatively sophisticated and will need to be 'told' that it is on a rolling road other wise the ECU will get confused when the rear wheels are doing 100mph with the front wheels doing 0mph and start to shut down/limit engine performance to 5,000 rpm or similar, not giving you a true figure.
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