 Throttle body question |
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| Strudelwagon |
 Jun 22 2009, 09:13 AM
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#1
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Member  Group: Members Posts: 411 Joined: 11-October 08 From: interior, British Columbia Member No.: 9,633 Region Association: Canada  |
Hi,
I have a 74 2.0 FI that some of the emission bits have been removed. While gathering the missing bits I noticed that the schematics for the vacuum hoses show that the vacuum ports on the distributer hook up to the ports on the T-body. Only one problem..I only have 1 vacuum port on the T-body and 2 on the distributor. anyone know why this is? Thanks SW |
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Replies(1 - 5)
| Dr. Roger |
Jun 22 2009, 09:32 AM
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#2
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A bat out of hell. Group: Members Posts: 3,944 Joined: 31-January 05 From: Hercules, California Member No.: 3,533 Region Association: Northern California |
there's two types of vacuum. above the carb's throttle plate, and below the plate.
one supplies vacuum when at idle and at lower engine load (below), and the other supplies vacuum when the throttle is opened up (above). one port is located either just below the carb or along the intake runner, and the other is just above it at the carb. |
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| Katmanken |
Jun 22 2009, 09:54 AM
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#3
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You haven't seen me if anybody asks... Group: Members Posts: 4,738 Joined: 14-June 03 From: USA Member No.: 819 Region Association: Upper MidWest |
One of the dual hose distributors has a hose to nowhere that just hangs down and hooks to nothing...
Anyone want to chime in on which version has this unusual WTF feature.... |
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| SLITS |
Jun 22 2009, 11:33 AM
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#4
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
Sure .... The '73 2.0L TB had ports for vacuum advance / retard. Between '73 & '74, the engineers decided that vacuum advance was not necessary so the eliminated one vac port on the TB. While both sides of the vac can on the dizzy had hoses connected to it, only one (vac retard) was actually hooked to the TB. Both units carry the same part number ..... 039 133 067
Dates are approximate as I doubt the factory doesn't have documentation on when the change occured. Images if desired, but they're gonna cost ya!!! |
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| Derek Seymour |
Jun 22 2009, 11:58 AM
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#5
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Member Group: Members Posts: 394 Joined: 10-March 09 From: Yucaipa Member No.: 10,151 Region Association: Southern California |
If your EGR system was removed then you "should" have a open port on the throttle body that points in the direction of the passenger side firewall. Normally this was used as the vacuum advance for the EGR valve. You can attach the distibutor advance (smaller black hose) to this port. If for some reason that port is missing from the throttle body and you only have the retard port that points straight back at the rear firewall then you can just leave the advance alone.
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| Strudelwagon |
Jun 22 2009, 03:03 PM
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#6
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Member Group: Members Posts: 411 Joined: 11-October 08 From: interior, British Columbia Member No.: 9,633 Region Association: Canada |
Thanks Guys,
I kinda figured it was a odd setup to have a hose to nowhere but maybe not so wierd for a 914. SW |
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