 '74 2.0 Throttle Body Questions |
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| loco914 |
 Sep 16 2026, 10:54 AM
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#1
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Thy wheels have left the rail...  Group: Members Posts: 48 Joined: 1-April 10 From: Amarillo, TX Member No.: 11,542 Region Association: None  |
Replaced the TPS and while the throttle body is out, I decided to clean it. During this process, I noticed a couple of things that I do not know if they are issues or not.
#1 The hole bleow the idle set screw (that I so dutifully cleared of many years of gunk) has no corresponding hole in the intake plenum. In fact, it appears to have been closed off intentionally. See Pic #1.  #2 The Vacuum line nipple that corresponds to the tiny hole above the butterfly in the throttle body is also closed off intentionally. See Pic #2.  Stock FI car, pertronix electronic ignition as info. Wondering if these are issues at all or do they need correction?? Thank you! |
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| emerygt350 |
Sep 16 2026, 01:09 PM
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#2
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Advanced Member Group: Members Posts: 3,737 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
That hole should be filled in the plenum. The plugged vacuum port is the retard port and unless you are looking for complete stock setup, having it plugged is fine. Just make sure you don't run your ported vacuum (if you have it) to your retard on the dizzy.
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| rjames |
Sep 16 2026, 05:12 PM
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#3
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I'm made of metal Group: Members Posts: 4,474 Joined: 24-July 05 From: Shoreline, WA Member No.: 4,467 Region Association: Pacific Northwest 
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That's the advance port. The retard port is below the butterfly and on the other side. The advanced port is plugged on later TBs.
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| emerygt350 |
Sep 16 2026, 05:38 PM
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#4
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Advanced Member Group: Members Posts: 3,737 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
Oh yeah, I thought that was the throttle linkage but now I see the TPS tensioner. Yeah, so late 74 throttle body.
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