Vacuum line

Hi,

Just looking at it, it's hard to tell. Do me a favor. First, start the engine and place your finger over the end of the connector to determine if there is vacuum present.

Next, at idle, have you noticed any vibrations or a rough idle?

I attached a pic below showing the vacuum hoses I suspect it could be related to. I highlighted them. If possible, take a pic further away from the engine so I can see more. Also, see if you can follow that hose to determine where the opposite end is.

Let me know.

Take care,

Joe

Hi, just to jump in. Start your vehicle up and turn the A/C on. Can you adjust the direction of the airflow? If it is blowing on defrost then that hose needs to attach to the intake manifold. If the air flow corresponds to the vent settings, then check to see if the EGR valve is missing the hose. Let us know.

If the vacuum line is for the HVAC unit, as long as the fan motor comes on you should still be able to change. The direction of the airflow if it is vacuum operated. If it is stuck at defrost when you try selecting a different setting, then that hose is for the HVAC unit. Let us know if the air flow is stuck in defrost, please.

Hi,

Is this the engine you overhauled? Also, is there a vacuum to the hose in question? I'm trying to determine if it goes to the intake or a component.

Let me know.

Take care,

Joe

Hi,

I just spent an hour with no success trying to find a vacuum schematic indicating colors. My manuals don't have one.

When I look in the manuals, the only colors indicated for engine vacuum are related to the HVAC system and you are not having trouble with that system. So, that leads me to think it is either the EGR valve or the vacuum regulator solenoid.

If you look at the attached pic, it shows the items I'm referring to. Let me know if either is disconnected.

Take care and good to hear from you again.

Joe

Quick question. When you start the vehicle up, is there vacuum at that hose when at idle or not? That should help simplify things.

Hi,

I certainly see it. The only thing indicated as a yellow hose is for the HVAC. Since you have no issues with the HVAC, there is a chance a different vacuum supply was attached in place of this one.

The idea you put a bolt in it is perfectly fine. You basically stopped a vacuum leak. We just need to identify where it goes.

1) Fuel pulse dampener (Between fuel rails).

2) EGR valve.

3) EGR vacuum regulator (firewall).

The three things mentioned above are components that require an engine vacuum to operate. I tried to get the best pics I could find for you to identify the parts. Also, the last pic shows a schematic that identifies each hose in the pic. Check these things and let me know what you find.

Take care,

Joe

See pics below.

Hi,

Wow. You got me stumped on this one. I have looked through everything. Now that you have the bolt preventing a vacuum leak, are there any noticeable issues? For example, is a rough idle, something that doesn't work, any fuel smells, or anything out of the ordinary?

The last pic I attached above and labeled is a vacuum schematic from Ford. LOL That doesn't mean something isn't missing, but it matches the ones from my manual.

Just to reconfirm. With the bolt out of the end, you have a vacuum supply to it, correct? Also, the opposite end goes to the intake manifold, correct?

I'm really trying here. LOL You have done a lot of work on this, and we need to get it perfect.

Let me know.

Joe

Hi,

Your drawing is perfect. I went through things again. Looking at your pic, the only thing not connected is the canister purge valve. You have the regulator, EGR, and EVAP service port connected. The only thing left is the purge valve.

Look at the pic below and let me know.

Joe

You have me stumped. The schematics all show three lines off the supply tree. I am going to ask a different tech for his opinion.

Ariana, I looked at the pics you attached above. I copied, circled, and reattached two below. What am I seeing in pic 1 that has a yellow vacuum hose going to it? EGR? Also, in pic 2, where is that physically located (shows the screw in the hose)?

Let me know.

Joe