Why is oil in throttle body ?

[964Cab]

I have a '90C4 911 (964) and I had oil dripping from the throttle body over electrical wires that exit from the alternator. Upon taking the throttle body off I found a significant amount of oil in the throttle body itself. There is one large 1" diameter oil hose that feeds the throttle body. What the heck is oil being feed to the throttle body in the first place ?

I assume with oil in the throttle body that this could influenec idle, etc. Also, all that oil dripping out past the throttle body rubber couplers is screwing the electrics up as many wires exit the alternator just under the throttle body area. Wouldn't it be better to feed the oil (breather hose I guess) into the valve cover (ala a PCV set up) ?

Has anyone else found oil dripping from their throttle body ?



[This message has been edited by 964Cab (edited 08-10-2001).]

[Rod Walter]

Oops - sounds like a case of oil overfill. With the engine at operating temperature and idling the oil should be around half way between the bottom and top marks on the dipstick. If you find the oil to be at the top of the dipstick or even above you may need to drain some. Is the car smoking any at startup?

And, no, it would not be better for the breather to connect to the valve cover. In a fuel injected engine with electronic engine management it is important for all of the air being fed in to pass through the air flow meter so that the mixture is properly set under all operating conditions.

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Rod Walter
'88 911 coupe

[964Cab]

Here is my link to pictures and text of my oil in the throttle bottle problem, any ideas ?

http://WWW.DIGITALCOLLAGE.COM/digitalpics/911OIL.html