Oil in air intake boot

[chuckybob]

i was inspecting the air intake boot for cracks when i found oil in it. what seems odder is that somehow, the oil came from the idle air stabilizer and burst the hose running from it to the air intake boot. what could cause that to happen? i noticed that the burst hose had no circlamp on it. could the lack of pressure on that end have caused this? is my engine kaput?

84 318i m10 if it makes any difference

[ZiMMie]

a lil bit of oil is acceptable in ur intake boot.
how much oil was in there?

[chuckybob]

about a cup to a cup and a half, in my estimate

[ZiMMie]

was it jst sittin in the intake boot? or was all oiled in the boot?

[chuckybob]

just sitting there, deeper in the back, though thats probly due more to how i removed the air filter assembly. the outside of the air intake boot is covered in oil from where the hose burst. any idea what could have caused this?

[roadrage]

Does anyone know the answer to this? Although a small amount of oil in the boot is "acceptable, it still isnt supposed to be there. Is there an EGR valve on these?

[AdamF 88iS]

Does anyone know the answer to this? Although a small amount of oil in the boot is "acceptable, it still isnt supposed to be there. Is there an EGR valve on these?

The answer is that there are no vent valves on these cars, the crank case vent is a straight open hose to the intake, so it tends to chuck some oil up there. In the case of the 84 318, the intake boot is almost a V shape as the throttle body points down on those cars, so it has a nice little spot to collect over time in the bottom of that V.

[roadrage]

Thanks for the answer. These things are never bad to know...yet another BMW tidbit of knowledge :D

[kowalski]

im not sure if it has the valve cover vent like the M42's but i was getting oil in through that, there is a rubber/plasticy cover that bolts into the top of the valve cover and its got a long runner to vent air but keep oil out, the seal was gone on that, so i cleaned it up and put some scilicon on it. havn't had a problem since.

[AdamF 88iS]

im not sure if it has the valve cover vent like the M42's but i was getting oil in through that, there is a rubber/plasticy cover that bolts into the top of the valve cover and its got a long runner to vent air but keep oil out, the seal was gone on that, so i cleaned it up and put some scilicon on it. havn't had a problem since.

As stated in my post, its a direct pipe on his car. No oil/vapor seperator like your car.

[kowalski]

good call i failed to read the whole post, ill make a note of doing that next time

[bmwsmurf]

The AFM in my 87 325is had a bit of oil in it too, for what it's worth.