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Generations 8-9 1987-1996 F150 + 1987-1997 F250, F350

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  #1  
Old 01-29-2018, 01:57 PM
dna_32746 dna_32746 is offline
 
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Help with vacuum air intake/after throttle body

Hey there. I have an 88 F250 460 and I have a vacuum line from the back of the throttle body next to the firewall. I'm not sure where it is supposed to plug into. Can someone help?

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Old 01-30-2018, 06:26 AM
dna_32746 dna_32746 is offline
 
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Originally Posted by dna_32746 View Post
Hey there. I have an 88 F250 460 and I have a vacuum line from the back of the throttle body next to the firewall. I'm not sure where it is supposed to plug into. Can someone help?

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It's the #12 in the diagram that I can't determine where it connects.

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Old 01-30-2018, 08:29 AM
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I will see if I can get a look at my '89 460 today, if the weather cooperates. Thanks for the diagram. That helped.
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Old 02-02-2018, 09:50 AM
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Sorry for the late reply. I can't see behind the throttle body very well, but I believe that 1/4" tube goes to a box that is mounted on top of the A/C unit on the firewall.

I'm guessing the vacuum tube is to bump up the idle speed when the A/C is in service? Just a guess.
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'78 F-150 Lariat

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Originally Posted by john112deere
I think the lens of time is required to differentiate between the real milestones, and the detours along the way.
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Strippers, ammo and SKS, wow, that is almost sig worthy!!
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Old 02-04-2018, 03:12 PM
dna_32746 dna_32746 is offline
 
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Originally Posted by fatherdoug View Post
Sorry for the late reply. I can't see behind the throttle body very well, but I believe that 1/4" tube goes to a box that is mounted on top of the A/C unit on the firewall.

I'm guessing the vacuum tube is to bump up the idle speed when the A/C is in service? Just a guess.
Thanks

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Old 02-04-2018, 05:37 PM
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It actuates the heater door and other blend doors, the box is the reservoir.
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