 Wrong throttle body?, Where dose this hose go? |
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| Rog914 |
 Apr 22 2003, 04:03 PM
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#1
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914 Fanatic  Group: Members Posts: 129 Joined: 5-January 03 From: Reisterstown,Md Member No.: 93  |
I have two vacuum hoses on the distributor vac adv. One comes from the back of the vac adv unit to the throttle body(below the throttle plate). The other hose is from front (or the cone part) of the vac adv and was plugged and shoved under some sheet metal. Where dose this hose go?
The throttle body looks new or rebuilt. There's a casting spot on the throttle body that looks like it's supposed to have a vac port(above the throttle plate, 180 degrees from the other) in it but dosn't. Thanks for any info, Ralph 74 2.0 |
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Replies(1 - 5)
| JeffBowlsby |
Apr 22 2003, 04:26 PM
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#2
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914 Wiring Harnesses Group: Members Posts: 8,510 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None 
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That is exactly how the 74 2.0s came from the factory, One port on the TB, 2 hoses from the vac advance, with the one hose merely tucked under the plenum.
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| SirAndy |
Apr 22 2003, 04:41 PM
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#3
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Resident German Group: Admin Posts: 41,649 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
yapp, and you were supposed to leave it hidden there so the guys doing your smog check wouldn't get all bend out of shape.
try to explain that to one of those guys: "no, i swear, that's how they came out of the factory. really!" Andy |
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| anthony |
Apr 22 2003, 05:03 PM
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#4
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2270 club Group: Benefactors Posts: 3,107 Joined: 1-February 03 From: SF Bay Area, CA Member No.: 218  |
There's actually supposed to be a cap on the second unused port rather than a hose. I guess they usually get lost.
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| Rog914 |
Apr 22 2003, 05:34 PM
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#5
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914 Fanatic Group: Members Posts: 129 Joined: 5-January 03 From: Reisterstown,Md Member No.: 93 |
Thanks for the info. It just seemed strange that one under the sheet metal.
Ralph 74 2.0 |
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| Bleyseng |
Apr 22 2003, 05:36 PM
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#6
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Aircooled Baby! Group: Members Posts: 13,034 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
Drill out the Throttle body and install a port like on the 73 TB's. It gives you alittle more advance between 1500 -3000 rpms.
The hole you drill that goes thru into the venturi is very small, probably the smallest drill bit in a standard drill assortment. The depth of the drilled hole for the steel or brass tube is 3/16th-1/4 inch. Measure the size of the port on the distributor for the correct size of pipe. Geoff |
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