Vacuum leak after changing plugs

SHEILA CRAWFORD

MEMBER
1998 MERCEDES BENZ ML320
6 CYL
4WD
AUTOMATIC
190,000 MILES

I see a broken part but don't know what it is. I was no where near it either to break it. Please please please help. Urgent. I have to try to fix by tomorrow. Have to move by Friday. Thank. You. It is that little black thing. (Obviously with all the pictures) Again, thank you for your help!

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8 Replies

BMDOUBLE

MECHANIC
1,139 POSTS

That is a variable intake manifold switch-over valve. It's responsible for changing the length of the intake runners during higher rpm's for increased engine performance. If you are in a pinch you can just block off the vacuum line that goes to this valve with a golf tee, bolt, or anything that will fit in the vacuum hose for that matter. If you have trouble disconnecting the line to the valve just cut it in half, you can repair that later, and plug it there.

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Tuesday, November 5th, 2019 AT 5:57 PM

SHEILA CRAWFORD

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So I don't need that black thing with the spring in it sealed shut? Or at all? Sorry I sound like a moron right now. Super stressed/rushed trying pack etc. I appreciate you getting back to me so quickly. Because this old guy is telling me it isn't broke in half. Only picture I see of it are completely sealed. Thanks

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Tuesday, November 5th, 2019 AT 6:34 PM

BMDOUBLE

MECHANIC
1,139 POSTS

The black thing looks like it has come apart, which they do when they become brittle. Originally they just snap together and have a vacuum diaphragm inside of it. You can cut that hose that I put an X on in the picture I sent and it should stop the vacuum leak, the check engine light will come on but the engine will not break down or anything. Safe travels.

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Wednesday, November 6th, 2019 AT 8:12 AM

SHEILA CRAWFORD