Vaccum line question - small black one.

vr4 said:
it also prevents the vent from switching to default on long periods of WOT.

on a gas super duty this takes about 6 seconds of WOT.
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so should I replace it the way it supposed to be from the factory, or just delete it and run the line from the intake to the Hvac thing?

my fender liner is off - now that i see whats up above there, im pretty sure i can just plug it back in?
 
If your engine is losing vacuum, then it has to work harder to put the vacuum back in..so yes your losing hp!
 
yikes, well i dont really feel it - the only thing i feel is that it takes a bit longer for it to go back to idle normally. also of course the hvac function... if it wern't pouring rain out ill day ide go fix it. Im sure itll be an easy thing to fix based on these posts.
 
yea you can wait til it stops raining.. no worries..

no wait..if you have a vaccum leak in the rain..it'll fill your motor up with water {I'm only kidding)

Vacuum leaks aren't cool though as they allow air into the engine that the PCM is "unaware of"..and is unable to properly deliver fuel due to what is called "unmetered air entering the engine".

in a worse case scenario you could melt some very important engine parts.
 
from the diagram - the black piece where three vac lines go into it... it has one on top - and two on the bottom - with a round thing between the two and the one... it shows the middle one going into the fender, on my car its the bottom line that runs into the fender... is it because i have a different year?

and as for running a new line from the intake mani to the hvac line - can you just use the existing line from the intake mani to the the hvac?
 
p3190002vg3.jpg
 
p3190001jn0.jpg


that bottom black line is the one that is broken... im not sure if its broken or just disconnected?
 
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notice on this diagram, the 2nd from the bottom line runs into the fender... however in my pictures on my car the bottom line runs into the fender...
 
94m5 said:
It runs from the vacumn port @ the middle of the intake manifold, across to the passenger side firewall. From there it's split and runs to a vacumn canister, and the other side runs through the firewall and hooks to the back of the HVAC unit. Iv'e had this happen with probably 30 or 40 different VIII's that I've worked on.


EDIT........... Iv'e removed the canister from the system by hooking the Supply line from the intake directly to the Supply line to the HVAC unit. IIRC, there is nothing else on that loop.


Mike
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can i just plug these lines into each other or whats the method for connecting them?
 
94m5 said:
It runs from the vacumn port @ the middle of the intake manifold, across to the passenger side firewall. From there it's split and runs to a vacumn canister, and the other side runs through the firewall and hooks to the back of the HVAC unit. Iv'e had this happen with probably 30 or 40 different VIII's that I've worked on.


EDIT........... Iv'e removed the canister from the system by hooking the Supply line from the intake directly to the Supply line to the HVAC unit. IIRC, there is nothing else on that loop.


Mike
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i see that the supply line to the hvac unit runs directly into the firewall, so when you say connect the two... do you mean take hook up both exisiting lines, or do you mean put that intake manifold vaccum line directly on the HVAC unit, i think thats what you mean but its inside the firewall - how does one get at to that?
 
94m5 said:
To get to the canister, you'll have to drop the inner fender liner out. Just run a new line from the intake manifold, to the HVAC supply line, and be done with it.

Mike
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ok now is it take off the fender or take out the inner fender liner? because you say two different things to get to the canister?
 
its not costing you more than 1hp at the most.

as for damage...its a tiny vacuum leak. no damage will be done.
 
Abe

What we normally do at the dealer level when the vac lines are not available is to cut the line and get a piece of vac hose and slide it over the ends of the split line to conn them together. Now if the line is in the fender we would most likely fight with the inner liner and do it that way rather than remove the fender. If you are trying to keep the car as original as possible then get some air line from a air suspension kit and use that stuff, again with small rubber vac lines for connectors.
 
ok gotcha, i comfortable with doing that - but is it better for me to fix it the way it was stock, or just eliminate the vac canister... if its just as easy as removing the fender liner to plug that line back into there, ill just do that - but if i have to take the fender off to get to that vac canister, and theres no harm no foul in running a new line from the intake mani to the hvac supply line (by combining the two) ill just do that.
 
its better to leave the canister (its there for a reason) and repair the vac line with a piece of rubber line thats a tight fit over it.
 
vr4 said:
its better to leave the canister (its there for a reason) and repair the vac line with a piece of rubber line thats a tight fit over it.
Click to expand...

And after you finish that stop messing with it! :D
 
Actually while we've got the ford techs in the thread, how does the fender come off anyway? My car got hit right after I got it painted (she hit my liscense plate, no damage luckily) but now my passengers fender looks like it was pushed back 1/4 of an inch so now it overlaps the door and makes it difficult to open at times. Its going to chip my paint soon, how can I adjust this? Or will I just have to pry them apart and hope it stays like that?
 
fender

Hey Rev
Maybe this pic will help find the bolts to break loose and shove the fender ahead a bit.
Max
 
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well its nice enough today, hopefully the car gods will send a good jack my way today so i can get in there to have a look at it. if i cant get to it: is it bad that is it not recommended (to the techs) that I run a new line eliminating that vac canister? or is it in your opinion better that I just remove the fender and do it the way it should be stock.
 
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