Quick Dumb question! Normal or not?

[bmwcr89]

When pulling out the oil dipstick while the car is running, the idle change erratically. Normal or not?

[erik325i]

normal

[backtrail69]

Creates a Vacuum leak.

[bmwcr89]

Thank you sir!!!! This have been bothering a lot!

[winstontj]

I have a followup question about this. Doesn't the valve cover breather hose attach to the TB BEFORE the throttle plate? Therefore this would not really create a vacuum leak?

I've been told that if I open the oil filler cap OR if I pull the dipstick the idle should change - since mine does not I'm wondering what's going on... Also perhaps I have screwed up and switched the valve cover breather hose and the ICV hose??? Although I don't think that's possible because of the orientation of the fittings on the TB.....

Is the valve cover breather hose attachment on the TB before or after the throttle plate???

[AdamF 88iS]

I have a followup question about this. Doesn't the valve cover breather hose attach to the TB BEFORE the throttle plate? Therefore this would not really create a vacuum leak?

I've been told that if I open the oil filler cap OR if I pull the dipstick the idle should change - since mine does not I'm wondering what's going on... Also perhaps I have screwed up and switched the valve cover breather hose and the ICV hose??? Although I don't think that's possible because of the orientation of the fittings on the TB.....

Is the valve cover breather hose attachment on the TB before or after the throttle plate???

You're right, but there's another breather tube under the manifold that's after the throttle.

[jlevie]

A lack of change in idle when pulling the dipstick or removing the oil filler cap could be due to a bad PCV, or an intake leak that prevents normal pressure in the intake.