Should this lower intake port be plugged?

JimC25

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I recently pulled my engine for a rebuild and am about 3/4 of the way done putting it back together. I just noticed an empty port in the lower intake on the drivers side, between the two fuel rail mounting bolt holes. I’m going through the pics I took during the tear down and can’t find anything that is supposed to be there. you can see the port just to the left of the coil platform in the below pic. Should something be there or should I just plug it? Thanks!
 

miesk5

96 Bronco 5.0
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Yo Jim,
Poor vision here. Look at first image below.
Is it a 5.0 or 5.8?
For now, 5.0
External
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ItemPart NumberDescription
18509Water Pump Pulley
28501Water Pump
38507Water Pump Housing Gasket
46700Crankshaft Front Seal
56C351Timing Pointer and Misfire Sensor Assembly
66019Engine Front Cover
76020Engine Front Cover Gasket
86010Cylinder Block
96890Oil Filter Mounting Insert
106714Oil Filter
116710Oil Pan Gasket
126675Oil Pan
13387549Bolt
146734Oil Pan Drain Plug Gasket
156730Oil Pan Drain Plug
166049Cylinder Head
1712A406Spark Plug Heat Shield
186754Oil Level Indicator Tube
196750Oil Level Dipstick
209430Exhaust Manifold (RH)
219430Exhaust Manifold (LH)
2212405Spark Plug
236584Valve Cover Gasket
246766Oil Filler Cap
256582Valve Cover (LH)
266375Flywheel
277007Engine Rear Plate
289A424Intake Manifold Gasket End Caps
2912270Hold-Down Clamp
3042955*****
319A425Seal — Manifold
329439Intake Manifold Gasket
338592Water Hose Connection
348575Water Thermostat
358255Water Outlet Connection Gasket
3618599Hot Water Heater Elbow Connection
3712A648Engine Coolant Temperature Sensor
3818599Hot Water Heater Elbow Connection
398A565Cap — Protective
406582Valve Cover (RH)
416A892Crankcase Ventilation Grommet
426A666Positive Crankcase Ventilation Valve
436A664Oil Separator Hose
4412106Distributor and Assembly Cap
459B989Throttle Position Sensor
469F670Idle Air Control Gasket
479F715Idle Air Control Valve
489471Intake Manifold Shield
499H486Intake Manifold Upper Gasket
509424Intake Manifold (Upper)
519A474Intake Manifold Vacuum Outlet Fitting and Cap
529A474Intake Manifold Vacuum Outlet Fitting and Cap
539D477EGR Tube
549D476EGR Valve Gasket
559D475EGR Valve
56391588Stud
579424Intake Manifold (Lower)
58376838Nut
599E936Throttle Body Gasket
609D280Fuel Injection Supply Manifold
619J314Fuel Supply Manifold Shield
629F792Fuel Injection Supply Manifold
639E527Fuel Injector Nozzle Tip
64388895-S2Bolt
6556704Bolt
669J433EGR Transducer
6756703Bolt
●●●​
Internal​
You must be registered for see images attach
ItemPart NumberDescription
143002Bolt — Camshaft Retaining
26278Camshaft Sprocket Washer
36278Camshaft Sprocket Washer
46256Camshaft Sprocket
56269Camshaft ****** Plate
66262Camshaft Center Bearing
76270Camshaft Rear Intermediate Bearing
86261Camshaft Bearing
96262Camshaft Center Bearing
106263Camshaft Rear Bearing
11384940Pin — Dowel
126250Camshaft
136010Cylinder Block
1457621-S*****
156C515Valve Tappet Guide Plate Retainer
166500Valve Tappet
176K512Valve Tappet Guide Plate
(8 Places)
186565Push Rod
196A588Rocker Arm Fulcrum Guide
206564Rocker Arm
216A528Rocker Arm Seat
22390385Bolt — Rocker Arm
236514Valve Spring Retainer (Exhaust)
246518Valve Spring Retainer Key
256518Valve Spring Retainer Key
266517Valve Spring Retainer Sleeve
276514Valve Spring Retainer
286513Valve Spring
296571Valve Stem Seal
306571Valve Stem Seal
31391413Bolt, 7/16-14 x 2.49
(10 Req'd)
32391414Bolt, 7/16-14 x 4.11
(10 Req'd)
339A487Secondary Air Injection Check Valve
349B449Secondary Air Injection Manifold Tube
3512405Spark Plug
366507Intake Valve
376505Exhaust Valve
386A008Cylinder Head to Block Dowel
39384918Bolt — Flywheel to Crankshaft
406375Flywheel
417007Engine Rear Plate
426701Crankshaft Rear Oil Seal
436303Crankshaft
446333Crankshaft Main Bearing
456325Cap — Main Bearing
466337Crankshaft ****** Main Bearing
476327Cap — Main Bearing
486330Cap — Main Bearing
49391546Stud, 3/8-16-7/16-14 x 4.09 (1 Req'd)
506334Cap — Main Bearing
516329Cap — Main Bearing
52391547-SBolt, 1/2-13 x 3.5 — Crankshaft Main Bearing Cap (9 Req'd)
536211Connecting Rod Bearing
54388907Key — Woodruff
556337Crankshaft ****** Main Bearing
566333Crankshaft Main Bearing
576148Partial Piston Ring Set
586102Piston, Pin and Ring
596135Piston Pin
606214Connecting Rod Bolt
616268Timing Chain/Belt
626600Oil Pump
636626Oil Pump Inlet Tube Gasket
646622Oil Pump Screen Cover and Tube
656A618Oil Pump Intermediate Shaft
666306Crankshaft Sprocket
676316Damper Assembly/Pulse Ring — Crankshaft
686312Crankshaft Pulley
69388813Bolt — Crankshaft Pulley Retaining
706378Crankshaft Pulley Retaining Washer
719278Oil Pressure Sensor
 

Tiha

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I don't know for sure myself, but should be pretty easy to figure out. If it is an open hole it needs to be plugged.

If it is not an open hole, still won't hurt to plug it, but I am not aware of anything that needs to go there as far as sensors or sending units.
 

Mike Birddog Bronco

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Just checked my 91 Bronco 5.8L engine the hole is there, but this hole is not used for anything. May be for some other application that is not used. Yes just plug it. Mine is not plugged has been of for 30 plus years.
 

miesk5

96 Bronco 5.0
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Yo Mike,
Welcome and thanks for the info!
Here are the 1990 F Series/Bronco Pre-Delivery Shop & Electrical & Vacuum Troubleshooting Manuals (EVTM), Partial by member Kingfish999 in Google Drive (similar to your 91) @ 1990 Ford Truck service manuals - Google Drive
Slow scrolling for my slow Comcast Highest Cost Blast Internet..
Suggest you download the docs for faster scrolling and to use the page index.

1991 Bronco Dealer Brochure by Ford via via Dezo's Garage @
https://www.xr793.com/wp-content/uploads/2020/07/1991-Ford-Bronco.pdf

Haynes Red Manual for 80-95 Bronco & F Series @ Hanes guide 80-96 bko f series.pdf via BroncMom
 

Sailorlou

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Yo Mike,
Welcome and thanks for the info!
Here are the 1990 F Series/Bronco Pre-Delivery Shop & Electrical & Vacuum Troubleshooting Manuals (EVTM), Partial by member Kingfish999 in Google Drive (similar to your 91) @ 1990 Ford Truck service manuals - Google Drive
Slow scrolling for my slow Comcast Highest Cost Blast Internet..
Suggest you download the docs for faster scrolling and to use the page index.

1991 Bronco Dealer Brochure by Ford via via Dezo's Garage @
https://www.xr793.com/wp-content/uploads/2020/07/1991-Ford-Bronco.pdf

Haynes Red Manual for 80-95 Bronco & F Series @ Hanes guide 80-96 bko f series.pdf via BroncMom
Thanks a bunch for the Hanes PDF.
 

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