Engine oil in the intake

[Bene]

Today when replacing the cone filter, I noticed engine oil in the maf. Could this be a contributing factor or related symptom of my engine steadily idling between 1500 & 2000?

[mr.vang]

for some reason a small amount of oil always finds its way to the intake. i'm pretty sure its normal unless it look like someone dump a good amount on it.

[Dagamus(NM)]

Vacuum leak will cause both high idle and oil in the intake elbow/afm.

Bitch tube seals love doing this, so does splits along the bottom of the hose from the tb to the top of the valve cover.

Check that hose first.

[jlevie]

Vacuum leak will cause both high idle and oil in the intake elbow/afm.

Bitch tube seals love doing this, so does splits along the bottom of the hose from the tb to the top of the valve cover.

Check that hose first.

In addition to those causes increased blowby in an engine with over 150k on it and worn valve seals will increase the amount of oil being dumped into the intake. As will leaking dipstick o-rings, a leaking oil fill cap seal, or leaking valve cover gaskets.

[Adrian_Visser]

Some oil in the intake elbow is normal, your high idle is most likely from something else. oil on the AFM isn't really normal though are you sure that it isn't filter oil?

[Bene]

it's dark, so I'm sure it's engine oil.

I think the problem is that the PO put a cone filter on the MAF and it's not mounted to anything. it's just resting on the frame. I want to put an airbox back in.

[immajackuup]

Some oil in the intake elbow is normal, your high idle is most likely from something else. oil on the AFM isn't really normal though are you sure that it isn't filter oil?

x2,just like all honda motors.

[MR 325]

I think the problem is that the PO put a cone filter on the MAF and it's not mounted to anything. it's just resting on the frame. I want to put an airbox back in.

That makes no sense. I'm not defending the cone setup since it's really just something that sounds good but it has nothing to do with having oil in your intake.

[Dagamus(NM)]

So the afm is not secured to anything? I'm still thinking vacuum leak. Remove the boot and inspect for cracks. Check to see if the screw that sets the throttle plate has been adjust it back down to a normal idle if it has. If your car has tired rings, the high idle when cold may be pressurizing your crank case sending more oil up the breather than normal.

I am still thinking vac leak though, cheaper and easier to fix than rings or valve seals. Rule that out first.

[Bene]

So the afm is not secured to anything? I'm still thinking vacuum leak. Remove the boot and inspect for cracks. Check to see if the screw that sets the throttle plate has been adjust it back down to a normal idle if it has. If your car has tired rings, the high idle when cold may be pressurizing your crank case sending more oil up the breather than normal.

I am still thinking vac leak though, cheaper and easier to fix than rings or valve seals. Rule that out first.

it idles high when warm. but yeah, it has over 240,000 on it (estimated), so that makes sense.

And yes, the maf and cone filter are just flopping around like an 80's porn star's tits. to the point where there's a big crack in the elbow which now may or may not be sealed by duct tape.

[Dagamus(NM)]

That crack is most likely the problem. A new elbow is pretty cheap from rmeuropean or autohausaz.

Once replaced, check the screw at the top of the throttle body and see if it brings the idle down. PO most likely opened that to maintain idle and not stall out from the vac leak.

[hotballs]

So are you running a MAF on an m20? Or are you talking about the AFM....