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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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Old 03-13-2013, 08:26 PM
SiscoKid SiscoKid is offline
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Vacuum leak

My 89 f-150 4.9 300 6 cyl has a vacum leak. From the gas tank, to under the hood from along the frame rail, the vacum line is missing. And i recently discovered a line running of the transmission that has. been plugged off about 5 inches from the tranny. Dont know where it goes I would love to get this fixed, so my truck stops running like crap. Anyone have a diagram for dummies that could help me reconfigure the vacuum line setup? Also, there is a small diameter tube running from the engine to the exhaust, just before the cat. Anyone know what that is and the purpose it serves? Whatever it is, has rotted off and makes for a horrible exhaust leak, and makes my truck sputter and **** like crazy. And quite possibly the best way to fix it? A combination of vacuum line leak and exhaust failure is driving me nuts! Please help...
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Old 03-13-2013, 08:34 PM
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Sounds like the vacuum line the goes on the back of a C6 transmission (TP vacuum motor).
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Old 03-13-2013, 08:38 PM
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Can't help you on the vac diagram.

The tube that hooks into your exhaust is part of the air pump system. I don't know the details of how it works, but at given times the valve it hooks into will open and the air pump will shoot extra air into the exhaust.

The way I fixed mine was I cut a chunk of 3/4" electrical conduit and welded it onto the tube. It's not 100% leak free by any means, but it's certainly better than it was.
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Old 03-13-2013, 08:50 PM
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Quote:
Originally Posted by subford View Post
Sounds like the vacuum line the goes on the back of a C6 transmission (TP vacuum motor).
Soo, from the back of the trans to a vaccum motor?
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Old 03-13-2013, 08:53 PM
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Nice fix idea on the air pump system... Did your truck run badly when that tube was separated from the exhaust??
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Old 03-13-2013, 08:56 PM
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Originally Posted by SiscoKid View Post
Soo, from the back of the trans to a vaccum motor?
No the vacuum motor is screwed into the back of the C6 Transmission and the vacuum line runs from there to the vacuum source on the engine.

This vacuum line tells the Transmission the throttle position or the load on the engine.
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Old 03-13-2013, 09:07 PM
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Thanks, that helps alot. Would you know where to find locality of the vacuum source at the engine from the trans?
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Old 03-14-2013, 08:20 AM
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It hooks to the Engine Vacuum Distribution Block.

Click the image to open in full size.

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Old 03-14-2013, 08:20 AM
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300 6cyl, 89 f-150, exhaust, vacuum leak

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