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Old 01-20-2013, 09:20 PM   #19
Registered User
Join Date: Sep 2002
Location: NJ
Posts: 17
My Ride: 04 330 zhp
Was experiencing exactly as detailed above, if going up uphill in high gears there was a very pronounced lugging/hesitation of the engine. It was very annoying and after researching here I had the DME reflashed at the dealer. I thought it worked but realized it was still there after hitting one stretch of road I regularly travel that always triggers it. It wasn't as bad as before, but gradually got worse.

I took it back to the dealer and it was diagnosed with a bad pre-cat O2 sensor. Replaced that and problem solved, engine felt noticeably stronger in that RPM range. Now? I wouldn't say the issue is back, but there's a definite hint of sluggishness at 2,800 - doesn't do the pronounced lugging but just seems to hang there slightly instead of pulling through the range evenly.
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