black deposits in intake runners

["Mark McCulley" <audicar99@hotmail.com>]

Hi all,

This weekend I removed the throttle body on my NF (10v non-turbo) engine 
to adjust the throttle position switch. The inside of the throttle body 
(on engine side) as well as the inside of the intake manifold were 
covered with a thin baked-on layer of oil. This stuff was really cooked 
on--I had to use lots of carb cleaner as well as scraping to remove it 
from the throttle body. I would expect some oily residue from the 
crankcase breather to be present in the intake but this caked on stuff 
leads me to wonder if the engine was severely overheated by the previous 
owner. Runs great though and there aren't any other symptoms of trouble. 
Could the hot exhaust gases recirculated by the EGR system cause this? 
Also, when I bought the car, the rubber crankcase breather hose was 
collapsed and the metal tube was pretty much blocked by crud. What 
happens if the crankcase isn't allowed to breathe?

MM

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