Vacuum hose diagram

TOXIC102480

MEMBER
2003 BUICK PARK AVENUE
3.8L
6 CYL
2WD
AUTOMATIC
220,000 MILES

I simply need a complete diagram of the vacuum lines on my car listed above, 3800 non turbo. Any help is greatly appreciated.

Friday, February 11th, 2022 AT 12:43 PM

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Hi,

The only thing I have available is for the evaporative emissions system (EVAP). Take a look at the two pics below. Let me know if that is what you need or if there is something specific you are looking for.

Take care,

Joe

See pics below.

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Friday, February 11th, 2022 AT 4:31 PM

TOXIC102480

MEMBER
2 POSTS

On second thought maybe this will help. Sometimes when idling the RPMs will dip really low or even occasionally stall, and sometimes it picks back up. I also have delayed take off but that doesn't happen much.

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Friday, February 11th, 2022 AT 5:02 PM

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Have you ever checked the idle air control valve (IAC)? The IAC is what is responsible for maintaining engine idle speed. Since the idle speed changes, I would remove and inspect it for carbon as well as in the intake manifold. If there is an air obstruction, it will cause issues.

If you look at pic 1, it shows the IAC. Here is a link that explains how to service one.

https://www.2carpros.com/articles/idle-air-control-valve-service

Let me know.

Joe

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