Quote:
Originally Posted by X53Jay4.8is
I am not so sure about guides on the 4.6is. I know that the guides are far more common on the 2004-2006 4.4L and 4.8L engines. If your are getting the cloud of smoke while idling then perhaps the guides are need of replacing. I have replaced a number of vanos units on various BMW V8s and while I am in there i have done the tensioners, timing guides, timing chain, tensioner, cooling system overhaul, and all timing cover seals. If the vehicle has 100k or nearing 100k I change all of the hoses to minimize the presence of leaks.
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Just to clarify in my own mind, it's the facelift N62 engines (4.4-4.8) that have the smoking on idle issue because of bad valve stem seals, right? And it's the pre-facelift M62 engine (4.4-4.6) that has the timing chain guide issue? If I remember correctly, chain guides are reommended maintenance at around 100k miles...
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Current-
--2003 X5 4.6
Estoril Blue
Black Nappa leather
rear air bags
OEM nav
OEM hitch
OEM cargo liner
Black housing SPYDER headlights - Evo-XR projectors
2017 GMC Sierra, 7K miles...
2017 GMC Sierra, 60K miles...
2015 GMC Sierra 280K miles...
2011 GMC Sierra, 500K miles...
Previous wheels:
--First love~
1969 Chevy C10, 396BB bored, 3 on the tree, Black ~SOLD~
--2011 Chevy Silverado LT 2500HD CCSB, Black, 250K miles ~SOLD~
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