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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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  #1  
Old 03-10-2010, 07:57 AM
beerfart beerfart is offline
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throttle body coolant tube broke

Have a broken coolant tube on throttle body on my 1995 f150. (5.0). Any one know how important this is. Can I just plug the lines?
Thanks
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Old 03-10-2010, 09:32 AM
alxsnmr alxsnmr is offline
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Supposedly, the coolant passage on the throttle body is to keep the throttle body from freezing up in cold weather. If you were on a cold snowing/raining/otherwise moist day this could be a concern as the throttle body could get condensation on it as that moist air hits a cool metal surface. It could cause corrosion on the steel or aluminum that would prevent smooth operation of the throttle plates.

Of course, this is all speculation and it is your choice in repairing or plugging it off...
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Old 03-10-2010, 11:24 AM
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just disconnect the lines and put a tube between them.
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Old 03-10-2010, 11:42 AM
rainbowATF rainbowATF is offline
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I have had mine removed for two winters here in N. Ohio. I did have a tube between the hose ends and laying up against the throttle body; but, then it looked like heck and when the engines cold and pumping cold coolant????; does it really help? Maybe its important in the tundra region. Anyways I have had no driveability problems.
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Old 03-10-2010, 03:41 PM
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I disconnected mine just because. I know the fuel should be as cool as possible but yet you run a coolant line through there. I dont understand that except for the far northern states. I live in South Texas
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Old 03-10-2010, 07:24 PM
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I tried bypassing mine for a little while and noticed nothing different, so I hooked it back up.
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Old 03-11-2010, 08:49 AM
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Probably what I will do
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Old 03-11-2010, 12:57 PM
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it is unnecessary in texas.
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Old 03-11-2010, 05:52 PM
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I researched it a while back and the general consensus was that it was better for fuel atomization if it was connected. I figure the factory made it that way for a reason.

If I remember right. Its primary purpose was to keep the TB from icing up. Subford said that its better to leave it connected.
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Old 03-11-2010, 06:43 PM
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if leaking then disconnect it, if not leaking then leave it alone.

i highly doubt that it gives better fuel atomization.
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Old 03-11-2010, 06:56 PM
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I believe thats what some of the seasoned FTE members said it did. There have been more than a few threads about it over the years. I don't know if it really does anything or not.

http://www.ford-trucks.com/forums/89...nt-bypass.html

Quote:
Originally Posted by subford View Post
Ford says hoses are there to give more power as warm air will vaporize the fuel better.
You already have the more O2 from the stock cold outside air at this point so now you need to warm it.

They are not for throttle body icing, if the throttle body was to ice up it would do it long before the water temperature got up high enough to melt it.
Also the throttle body is not made with a venturi like it was with carburetors that drop the air temperature and cause icing between 33-38 degrees on humid days. So no air temperature drop with the throttle body and no icing.
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Old 03-11-2010, 07:07 PM
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i think i am "seasoned" enough to say what i said.

think about it:

in cold climate this may help vaporize fuel but if the engine is hot and the air around it is also hot then the warm coolant would not be needed.

after the engine is warmed up the additional heat from the coolant will not help it and in fact may hurt it.

i am in ohio now but while living in l.a. i bypassed my corvettes coolant lines to the t.b. and it ran better then it did with it hooked up.

hope this clears my view of this up for you.
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Old 03-11-2010, 07:17 PM
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I had this happen on a 5.0 in a bronco.........Pull the throttle body, drill out the broken tube/fitting, tap it 1/4 npt, buy a 90 deg. 1/4 npt brass barb fitting from a industrial parts house.........install.............Permanent, professional level repair.
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Old 03-11-2010, 07:29 PM
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Quote:
Originally Posted by Old93junk View Post
I had this happen on a 5.0 in a bronco.........Pull the throttle body, drill out the broken tube/fitting, tap it 1/4 npt, buy a 90 deg. 1/4 npt brass barb fitting from a industrial parts house.........install.............Permanent, professional level repair.
This is what I would do!!
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Old 03-11-2010, 07:52 PM
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I considered the pipe thread and hose fittings to make a repair; however I weighed it against breaking the tap off in the Throttle body or cracking it and decided not to try. I removed the hose fitting on the intake standpipe fitting and plugged that. Then removed the T-fitting in the heater hose and replaced with longer hose. I used a piece of the T-fitting-bracket to cradle the hose to the alternator bracket as original.
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