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N54 Inconsistent Performance
I've an 08 xi with the n54, and the engine's performance is all over the place. It seems, on the same tank of fuel, 93mron, that some days it will really pull hard, and some days it's just plain wheezy. A strong correlation seems to be adaptation: a long drive on the highway and it pulls like a train, but when the engine isn't good and hot (and/or I've been tootling around town) it's downright anemic. Outside ambient has been quite cold these last few days, but the performance behavior is mimicked whether it is 70f or 15f. Has anyone noticed this? Is this indicative of some looming fault? No codes or shadow codes, either. Car is bone stock except for a VRSF 7" ic. Carbon cleaning was apparently done 5k miles ago by po.
I've checked for boost leaks as well...i replaced all the bad connections with the VRSF kit. No difference.
Thanks,
-Cm
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