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Old 10-25-2012, 04:51 PM
Hemorrhage Hemorrhage is offline
Officially Welcomed to the 'Fest
Location: Pennsylvania
Join Date: May 2012
Posts: 277
Mein Auto: BMW 335xi
Originally Posted by Orient330iNYC View Post
the N54 is prone to carbon building on the intake valves, this leads to generally bad performance.
i suspect that at your mileage, this may be a factor in your misfires and stumbling
unfortunately, a walnut shell blasting of the valves is not cheap- 5-600 dollars, but the only way to clean it if you have the buildup. its visible if you pull the intake manifold.
Before taking the X hours to do that...isn't there a faster way to check if that MIGHT be a possibility?

Would checking the tips of the spark plugs give any insight?
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