300 I6 & automatic ???
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Joined: Feb 2000
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From: Palm Bay, Florida
300 I6 & automatic ???
Folks I need some help with vacuum ports and what is hooked to them:
I have a van with a 240/300 I6, which I'm almost positive was a stick originally, it now has a C4 auto, it has only 1 vacuum port on the intake right under the carb mount, the line has been "T'd" going to the PCV, and the trans. modulator, the PCV is getting most of the vacuum, and the trans. doesn't shift right as a result.
I will soon be adding my power booster from my parts van, and want to get the trans to shift properly.
I think I need a second vacuum source, should I have a carb with a vacuum source on it?
I know that there are plenty of I6s out there, so can someone PLEASE tell me how their vacuum is hooked up??
Thanks!!!! -Supercab
I have a van with a 240/300 I6, which I'm almost positive was a stick originally, it now has a C4 auto, it has only 1 vacuum port on the intake right under the carb mount, the line has been "T'd" going to the PCV, and the trans. modulator, the PCV is getting most of the vacuum, and the trans. doesn't shift right as a result.
I will soon be adding my power booster from my parts van, and want to get the trans to shift properly.
I think I need a second vacuum source, should I have a carb with a vacuum source on it?
I know that there are plenty of I6s out there, so can someone PLEASE tell me how their vacuum is hooked up??
Thanks!!!! -Supercab
Senior User
Joined: Mar 2000
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300 I6 & automatic ???
I don't know much about the 240/300 six, but if that vac you have is from a spacer between the carb and the intake, that is for PCV only. Is there a plugged threaded hole somewhere on the intake manifold that a take off can be screwed into? Need good solid vac for the modulator and booster.
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Joined: Jul 2001
Posts: 250
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300 I6 & automatic ???
you should be able to run any manifold vacuum controlled device from a single man. vacuum port. The t in the spacer is manifold vacuum, but there night also be a port in the intake. If no port exists & you wanna keep the auto you can drill & tap a hole for a vacuum port anywhere in the intake preferably in the open plenum beneath the carb. You can avoid pulling the intake when you do it but you have to pull the carb and have a shop vac with a small enough hose to go down in the intake to suck out the metal shavings, also put bearing grease on the drill bit and tap. If you don't wanna take any chances pull the intake and do it. Just make sure you tap it with a npt tap since vacuum ports and fittings have pipe threads. But, I am 99% positive whatever manifold vacuum source you do have is made to support the pcv, brake booster, and modulator. It was cheaper for Ford to put a vacuum source for a modulator on all truck including those with manual trans's, since they wouldn't have to make two different intakes or carb spacers.
John
John
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Joined: Oct 2001
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300 I6 & automatic ???
Look on the out side of the intake below the carb. There is normally more then one plug you can remove and add a screw in port. You're never going to make the trans shift properly with the modulator vacuum being shared with the PVC. Sorry everyone has tried that one and been a victom of it's results. If all else fails Get a 3/8" threaded insert and the appropriate drill and tap and install your own vacuum port. Do it low on the intake manifold and put some thick grease on the drill bit to catch the metal flakes. Then vacuum the hole with your wifes vacuum cleaner, when she's gone of course. Have the carb' off to make sure you get all shavings. Repete after tapping the hole.
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