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3002 tii · 10-05-2014, 01:20 PM

FWIW I had the same rough idle a while back and found cleaning the solenoids did the trick, or at least bought me enough time *knock on wood*. IIRC, the only thing I replaced were new o-rings as those are intended to be one time use only.

I am surprised though that you replaced the VCHG. That was only an issue for early n52's (i.e. 06 models), 07+ changed over from the aluminum bolts and didn't have the leaking issue. The only potential leak I addressed was the oil filter housing gasket, and I did that as routine maintenance while doing the water pump and T-stat.

10-05-2014, 01:20 PM	#7
3002 tii Lieutenant General 2289 Rep 12,565 Posts Drives: Z4 M, X5, GX460 Join Date: Apr 2008 Location: CT iTrader: (99) Garage List F15 X5 xDrive35i [8.75] E86 Z4 M [10.00] F10 550i (Retired) [9.17] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.50] E85 Z4 M (Retired) [9.41] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [9.24]	FWIW I had the same rough idle a while back and found cleaning the solenoids did the trick, or at least bought me enough time knock on wood. IIRC, the only thing I replaced were new o-rings as those are intended to be one time use only. I am surprised though that you replaced the VCHG. That was only an issue for early n52's (i.e. 06 models), 07+ changed over from the aluminum bolts and didn't have the leaking issue. The only potential leak I addressed was the oil filter housing gasket, and I did that as routine maintenance while doing the water pump and T-stat. __________________ Follow for latest mods
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