Real Time Newbie Help-- Where is Intake Manifold

[DocuDude]

Rookie Help-- Where is vaccuum port on Intake Manifold?

Looking to plug the egr vacuum modulator to intake manifold per FSM emssion manual for EGR.

I am unsure where the intake manifold to plug the hose to is?

Any pics you can show me....thanks

 

[lovetoski]

The intake manifold is on drivers side of the engine - it's silver, and big. The carb sits on top of it.

#20 in the attached pic is the intake/exhaust manifold. Intake is the one on top, exhaust is the one on the bottom.

http://www.sor.com/shared/image/044E.gif

 

[Spike Strip]

EGR Mod in red.

Underneath (green arrow) is EGR Valve

Pink Dots are sections of intake manifold location (underneath all that junk) Aluminum part that bolts to the head.

 

[DocuDude]

Thanks for quick response....


As per Emissions FSM 3-15----

How would I connect a hose from the egr vacuum modulator to the intake manifold. Where is this port on the intake mandifold to connect to?

 

[takeitforgranite]

Spike, that's a pretty clean lookin' 2F!

 

[Spike Strip]

Not my rig... Mine is all over the yard and garage and shed

Pic is from a 110k mi '87 that I was looking at, but the owner wouldn't budge from his $12K asking... So I graciously let him keep it.

 

[DocuDude]

So where on the intake manifold can I connect the vacuum hose to?

 

[Spike Strip]

I'm not sure I understand what you want to do?

Do you want to BLOCK the vacuum to the EGR, thus keeping it from working? ... ?

 

[DocuDude]

I am testing my EGR due to high NOx emissions.

In the Emissions FSM (3-15) it states "Disconnect the vacuum hose off of Port R on the EGR vacuum modulator, and connect it directly to the intake manifold with another hose"

I know where Port R is, I am unsure where to connect it to the intake manifold. Could u circle that on your pic?

Thanks all.

 

[Spike Strip]

Oh, ok, little clearer now...

You can't see it very well in the picture, but on the rear of the intake manifold, near the firewall (RED), there's a port. I think you can use the smaller of the two- it's direct vacuum. Also, there's a port (green), on the thing called a gas filter? but I'm not sure weather it's direct vacuum or modulated... It's black and has three fingers on it.... (anyone?)

The port in red has three concentric rings on it, with a large port on top and a smaller one off the side. Looks a little googie to me...

 

[hank14]

Oh, ok, little clearer now...

You can't see it very well in the picture, but on the rear of the intake manifold, near the firewall (RED), there's a port. I think you can use the smaller of the two- it's direct vacuum. Also, there's a port (green), on the thing called a gas filter? but I'm not sure weather it's direct vacuum or modulated... It's black and has three fingers on it.... (anyone?)"

I measured the vacuum on the "gas filter" in front of the carburetor- it has about 9 inches of vacuum, where as the manifold vacuum is 18-19. Assuming my "gas filter" is working properly after I cleaned it, I do not think it is the appropriate place to supply vacuum to test the EGR system. When I tested mine per 3-15 in the FSM, I rremoved the small hose coming off the manifold circled above that goes to the A/C idle up solenoid, and hooked it into the EGR modulator as described.

 

[hank14]

EDIT: Looking at the picture of the bottom of page 3-15 in the emissions FSM, it clearly shows connecting one of the vacuum lines from the "gas filter" (pictured above) to port R of the EGR modulator. This should cause high vacuum between the EGR modulator port Q and the EGR valve, and cause the engine to stall. If this functions correctly, it should mean the EGR modulator is working properly.

 

[DocuDude]

EDIT: Looking at the picture of the bottom of page 3-15 in the emissions FSM, it clearly shows connecting one of the vacuum lines from the "gas filter" (pictured above) to port R of the EGR modulator. This should cause high vacuum between the EGR modulator port Q and the EGR valve, and cause the engine to stall. If this functions correctly, it should mean the EGR modulator is working properly.

I dont know. The FSM illustration looks a lot like the port circled in red. I will have to test out tomorrow.

 

[hank14]

I dont know. The FSM illustration looks a lot like the port circled in red. I will have to test out tomorrow.

It's the gas filter circled in green. I tested mine again yesturday and it worked to spec.

 

[Spike Strip]

I dont know. The FSM illustration looks a lot like the port circled in red. I will have to test out tomorrow.

Docu, it's the part circled in GREEN -- I finally looked at the FSM pictogram.

It's called a gas filter, its black, and will have three (3) ports (hoses) coming off it.

GENTLY - I MEAN GENTLY pull off one of the hoses (20 + year old plastic is very brittle) and attach the hose from port R to the gas filter.

Where in So Cal are you?

smiley face is only meant to convey that working on 'cruisers is FUN FUN FUN !!!


S.

 

[Norris Marshak]

Newbie/rookie here, but I've been down this road. You can check the EGR valve by placing a mirror beneath it. If it does not move, your issue may be the thermostatically controlled "brain" at the front of the head, readily identified by two blue wires. I remedied the NOX with a new CAt, but only marginally. With the new brain, the EGR is working well and the NOX numbers great! I hope this is the issue as it is a relatively quick fix. Good Luck!

 

[hank14]

Newbie/rookie here, but I've been down this road. You can check the EGR valve by placing a mirror beneath it. If it does not move, your issue may be the thermostatically controlled "brain" at the front of the head, readily identified by two blue wires. QUOTE]

I'm afraid this is not helping much. Are you talking about the BVSV's located below the thermostat housing?

 

[Norris Marshak]

Hank 14- Being the newbie/rookie that I am, I hope I haven't caused confusion. What I am referring to as "the brain" is the plug with two blue hoses, not wires, on the driver's side below the thermostat housing. I guess I need to learn the correct names of the various parts in the engine compartment. Sorry for the confusion.