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Old 10-19-2012, 12:54 PM
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540 M-Sport 540 M-Sport is offline
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Location: Seattle, WA
Join Date: Apr 2004
Posts: 5,536
Mein Auto: 01' 540 M-Sport, Scuderia
One thing that could cause loss in efficiency and not easily detected, might be intake valve deposits. You might try sucessive treatments with LubroMoly Ventil Sauber. But I am not very confident this is your problem.

It might be worth having someone with a more sophisticated engine diagnostic software program plug in your car and read the various sensor data.
Factory 540 M-Sport (Canadian market), factory Bluetooth, factory M-Audio 10" dual voice coil subs, Homelink, M5 rear stabilizer bar, H&R 15mm spacers, Bilstein B14 PSS coil overs, Stop Tech ss brake lines, Akebono Euro Ceramic brake pads, oem Brembo and Zimmerman rotors, Dinan Stage 1 software, Strong Strut front upper stress bar.
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