Remove Oil Cap - Idle remains stable!

[WydRyd]

Gents,

I thought when you remove the oil cap to check the oil level, the engine idle should drop (or dip) 100-200 RPM's. Mine does not seem to do this The idle remains rock steady!

Does this mean I have a big gaping vacuum leak somewhere?

I checked as many of the vacuum hoses around the intake and oil filler neck and they look fine

What else can I check?

I'm thinking perhaps:-

1. Checking and re-torquing the intake manifold bolts - What torque setting should I use?

2. Checking & tightening the rubber boot that joins the left and right "hemisphere" of the intake manifold?

Anything else?

P.S: I also noticed a white'ish/orange'ish foam residue under my oil cap. Is this something to worry about, or is it just moisture/condensation? It's been pretty cold down here lately, so I'm hoping the latter!

[safe]

Mine doesnīt drop either. I donīt have any vacuum leak.

[wholberg]

Originally posted by safe
Mine doesnīt drop either. I donīt have any vacuum leak.

Same here.

[ChrisBennet]

It means your idle stabilizer is doing it's job and the breather hose restrictor is in place.
-Chris

[kqw]

You are correct....there should be a drop in idle when removing the oil filler cap.

Looks like you are on the right track. The intake manifold bolts should be torqued to 18 ft/lbs. Make sure you get to all 12 bolts.

As Chris mentions...check the restrictor valve, make sure it is positioned correctly.

[jbrinkley]

read Tyson's comment
Engine died while checking oil and other Q's