vacuum hook-ups
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Banned
Joined: Jan 2003
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From: Grande Prairie, AB
vacuum hook-ups
Ok guys, Im confused,
On the intake manifold there is a plug with 3 ports on it.
One goes to the brake booster, the other one has hose that connects to the other side of the plug.
My dizzy vacuum hose goes to a port on the pass side of the carb,
I have a vacuum gage but i get nothing out of that port on the carb or out of the dizzy.
There is another port on the carb above the float bowl which has no suction and a nother on the driver side which also has no suction.
After i fixed my timing last night it started to make a high pitch squeel when i rev it up, doesnt do it at idle. I cant tell where its coming from.
Also the vacuum at idle (out of intake) is about 14hg and at about 1500-2000 rpm its about 19.
Any ideas?
Ill keep searching the forum.
On the intake manifold there is a plug with 3 ports on it.
One goes to the brake booster, the other one has hose that connects to the other side of the plug.
My dizzy vacuum hose goes to a port on the pass side of the carb,
I have a vacuum gage but i get nothing out of that port on the carb or out of the dizzy.
There is another port on the carb above the float bowl which has no suction and a nother on the driver side which also has no suction.
After i fixed my timing last night it started to make a high pitch squeel when i rev it up, doesnt do it at idle. I cant tell where its coming from.
Also the vacuum at idle (out of intake) is about 14hg and at about 1500-2000 rpm its about 19.
Any ideas?
Ill keep searching the forum.
Thread Starter
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Banned
Joined: Jan 2003
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From: Grande Prairie, AB
Sorry about that, The plug that threads into the intake has three ports on it, two small ones, one larger one . The large one goes to brake booster, and a hose connects the other 2 together so its just a loop.
And yeah, its the 390, I hooked everything up the same way as the 360 was hooked up before i swapped.
thanks
And yeah, its the 390, I hooked everything up the same way as the 360 was hooked up before i swapped.
thanks
FTE Legend
Joined: Jun 2004
Posts: 31,895
Likes: 2,385
From: Upstate NY
Is the hose doing a good job blanking off the other two ports? You should be getting any vac from the dizzy, The vaccum advance gets it's vac from the pass side of the carb. I'm not sure what the other vac ports on the carb would do for you. They can be blanked off. The noise sounds like a vac leak. Does the idle speed change if you spray starter fluid around the base of the carb while it is running. That can tell you if it is sucking wind there!
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Banned
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From: Grande Prairie, AB
I found the leak, it is at the base of the carb.
I got a couple new gaskets and now im wondering, what way does the spacer go, the pvc plug facing forward and the flat surface facing upwards was the way it was when i took the carb off. It got to dark so i had to stop for the night.
What way is your spacer??
I got a couple new gaskets and now im wondering, what way does the spacer go, the pvc plug facing forward and the flat surface facing upwards was the way it was when i took the carb off. It got to dark so i had to stop for the night.
What way is your spacer??
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Actually the port on the passenger(right front) of carb is a ported vacuum and you get no vacuum until the carb is off idle. It does not run to the base of the carb but to the throttle bore just above the throttle valve in the right front throttle bore. If you are running the dist. off one of the carb base fittings, don't.
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Banned
Joined: Jan 2003
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From: Grande Prairie, AB
Hmm,,
there is only three ports on my carb, one sits above the float bowl area, Figure its a bleeder or vent or something, the other one is on the driver side front underneath the accelerator pump, just a small little nipple.
none of which had vacuum , So im thinking i had the spacer on upside down blocking off the passages or something.
Ill figure it out tomorow i guess.
thanks guys
there is only three ports on my carb, one sits above the float bowl area, Figure its a bleeder or vent or something, the other one is on the driver side front underneath the accelerator pump, just a small little nipple.
none of which had vacuum , So im thinking i had the spacer on upside down blocking off the passages or something.
Ill figure it out tomorow i guess.
thanks guys
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Post Fiend
Joined: Feb 2000
Posts: 5,130
Likes: 8
From: Brea CA
The spacer should have the PCV port coming out the rear.
What carb. is on there? The dizzy vacuum should only come on when you have the throttle opened up at least into the transfer slot, there will be nothing at idle.
What carb. is on there? The dizzy vacuum should only come on when you have the throttle opened up at least into the transfer slot, there will be nothing at idle.
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Banned
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From: Grande Prairie, AB
i got it figured today,
The spacer could only go one way, the way in which the pvc port comes out at front of engine, if i flipped it upside down (upside to the way it was previously) making the pvc at the rear then the throttle was interferring with the spacer making it not able to move.
And now there is vacuum at teh advance when givin throttle, there wasnt yesterday, must have been the vacuum leak causing there to be no vacuum.
I just blocked off the other port with a peice of house with a screw in it.
The carb needs to be fine tuned, maybe even rebuild, idles funny. It is a motorcraft 2150 i think, not sure though. Its the carb of my 360.
Thanks guys for your help.
The spacer could only go one way, the way in which the pvc port comes out at front of engine, if i flipped it upside down (upside to the way it was previously) making the pvc at the rear then the throttle was interferring with the spacer making it not able to move.
And now there is vacuum at teh advance when givin throttle, there wasnt yesterday, must have been the vacuum leak causing there to be no vacuum.
I just blocked off the other port with a peice of house with a screw in it.
The carb needs to be fine tuned, maybe even rebuild, idles funny. It is a motorcraft 2150 i think, not sure though. Its the carb of my 360.
Thanks guys for your help.
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