Remove the plastic pipe that connects the air flow meter to the throttle body. It is two hose clamps and two small hoses. You can even leave the hoses attached and just move it slightly to the side.

Then, Push the throttle body flapper open with your finger or a screwdriver and look inside the intake with a flashlight.
Do you see puddles of oil? All dry? Spike (The evil gremlin)?

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles