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FORD BRONCO -> ENGINE & COOLING; swaps, specs, snorkels, vac. diagrams... -> Intake - Filter, Manifold, Snorkel -> Manifold
WELCOME to MIESK5's BIG BRONCO LINKS - We now have over 26,000 LINKs!
This is a Ford Bronco, Truck & Van Technical & Parts LINKS site developed by the MIESK5 Family & is not affiliated with the Ford Motor Co. in any manner.
Although we initially developed this site for 78-96 Big Broncos, information in many Links also applies to F, E Series & Cars. UPDATE; all Links via web.archive may be down; Copy orig. URL & go to to search for the new archived copy
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Availability of New Silicone Gasket & Sealant TSB 98-7-4 for 84-96 Bronco; 84-98 Econoline, F-150, F-250 HD, F-250 LD; 84-99 Super Duty F Series, etc.
Gasket Removal TSB 93-23-14 for 88-93 Bronco, F Series, Aerostar, Econoline & many others
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300 CID, 84-85, Feedback Carbureted Problem Areas; "...This pickup/Bronco application typically suffers from abuse, neglected service and a poorly designed manifold and feedback system. The vehicle will drive tolerably in open loop all the time, suffering from poor driveability and fuel economy (typically in the 8-10 mpg range). Check the mixture control solenoid on the carburetor for a varying duty cycle. A fixed 50 percent duty cycle is the open-loop default value. Check the oxygen sensor for switching (frequency) and amplitude. Verify powers and grounds to the ECU (computer - located inside, above the accelerator pedal). The ECU and 02 sensor grounds are on the firewall in the engine compartment low on the driver's side. Other critical inputs to the computer are the coolant temperature sensor and manifold absolute pressure (MAP) sensor (frequency-based), which both ground ahead and above the battery on the right inner fender well. Manifold leaks are very common (both intake and exhaust). Check all manifold, carburetor mounting and manifold preheat bolts and gaskets for tightness and leaks (flowing propane around gasket areas makes this fairly simple). The exhaust manifold is a relatively thin casting and can be badly warped, particularly if the vehicle has been heavily loaded, used for towing or driven through deep water. A leaking exhaust manifold will dump raw oxygen on the O2 sensor and can make the feedback system attempt to go rich. Carburetor throttle shaft wear is an area for particular attention. Some of the carburetor screws have a propensity for vibrating loose and having the carb literally disassemble itself in normal use. When rebuilding the carburetor pay careful attention to the reassembly of the accelerator pump components -- the washer goes on top of the diaphragm, not below it. This problem has been seen on several remanufactured carburetors as supplied from the rebuilder. Rejetting should be considered a last resort. Air injection switching (upstream, downstream), exhaust system integrity, and catalyst function are areas of common problems on these trucks as well..."
Source: by via
460 Bolt Tightening Sequence
Source: by Steve83 (Steve, That dirty old truck) at
Clifford & Clifford dual-exit Headers Installation in an 80 4.9
Source: by Ryan P (Odey, OD) at
Clifford RamFlow Intake EFI Manfold & 390 Holley Installation in an 84
Source: by SyntheticD (Ferby) at FSB
Coolant & Vacuum Leaks, 5.0L, 5.0L HO & 5.8L; "...Intake manifold coolant and vacuum leaks have been found to be quite common on Ford 5.0L, 5.0L HO (High Output) and 5.8L engines. For this engine, following the proper intake manifold torque values and torque sequence is very critical..."
Source: by
Crack Locations Video in an 86 5.0
Source: by JKossarides ("The Bronco", Jean) at
Edelbrock Dual Plane Aluminum & 600CFM EGR 4bbl & with EGR pic in a 78 400M
Source: by MDG (Gryphon's Delight) at
Edelbrock Performer 400 Intake Manifold Installation for EFI Conversion in a 78
Source: by Quadzilla (Big Red) at
Edlebrock Streetmaster 400 Manifold w/FI Installation in an 81 409C
Source: by drueg at
Gasket Installation, Upper & Lower in a 91 5.8
Source: by Meixter (Cookie Monster) at
Gasket Installation, Upper & Lower in an 86 5.0
Source: by slim68 at
Gasket pics, 5.0/5.8 Cars & Trucks, GT 40, Trick Flow & Edelbrock
Source: by Gacknar (The Mall-Crawler, Jeremy, "Big grey megga beast") at
Gasket Removal TSB 93-23-14 for 88-93 Bronco, F Series, Aerostar, Econoline & many others
Source: by Ford via
GT40 Installation from a 95 Explorer in an 87
Source: by broncoflorida at FSB
High Idle & Dieseling Troubleshooting Chart in a 94, from PCED Chart 7 for a 94; Preliminary Checks; Vacuum Leaks, Throttle Plate & Linkage, Speed Control Chain Binding/Sticking, Air Intake Tube/ Intake Manifold Leaks..." READ MORE
Source: by Ford via Steve83 (Steve, That dirty old truck) at
Installation pics in an 80 302
Source: by DeepSeaSnake at
Intake Runner Length Prediction Calculator
Source: by Bowling & Grippo
Offenhauser & Offy split header Installation in an 85 4.9L
Source: by BigDadddy (Blue or Old Blue) at FSB
Offenhauser & Offy split header Installation pics in an 85 4.9
Source: by BigDadddy (Blue or Old Blue) at
Offenhauser Dual Port & Holley 390 Installation in an 81 4.9
Source: by AbandonedBronco (Spartan) at FSB
Offenhauser Dual Port & Holley 390 Installation in an 81 4.9
Source: by AbandonedBronco (Spartan) at
Oil Consumption Test TSB 90-01-09 for 5.0L EFI in 87-90 Bronco, F Series & many others
Source: by Ford via Chilton
Removal, Upper Intake in a 90 5.0
Source: by RFR (Mark B) at via web.archive
Removal, Upper Intake in a 94 5.8
Source: by joelb23 at FSB
Removal, Upper Intake in an 89 5.0
Source: by Waltman at FSB
Removal, Upper Intake in an 89 5.0
Source: by Waltman at
Removal, Upper Intake pics in a 94 5.8
Source: by joelb23 at
Removal, Upper Intake Tip & Tool in an 86 5.0; "...This is the Torx T-40 you're going to need to get that pesky inner center screw out with to remove the EFI's upper intake. Trouble is you'll never get that 3/8" drive socket between the runners, with the space the way it is. I just drift the center part of the T-40 out. It happens to be 1/4" hex. Now it's seperated from it's 3/8" host housing. I use contact cement to glue the T-40 bit into a 1/4" drive 1/4" sized socket and then work with several 1/4" rachet extensions, which pass through the intake runners no trouble at all..."
Source: by Sixlitre (Malcolm H, Eddie Bauer) at
Removal, Upper Intake, T40 Socket Overview & pic; "... This tool is made to help remove the upper intake from your vehicle. It is not needed for all Ford intakes. Some intakes have longer bolts that are easier to reach. But if you can only see 4 or 5 of the bolts holding the upper intake on the engine, you’ll probably need one of these. The bolt that you can’t see way down in the middle has a torx 40 head. It is possible to make a chain of 3/8 or 1/4 drive socket pieces to reach these bolts. But this page is about all the cool tools you don’t have yet..."
Source: by Ryan M (Fireguy50) at
Repair Price Estimator, Bronco from 90-96 and other Fords; including labor & parts, shops in area, by Zip Code
Source: by RepairPal
Tuning for Performance & Economy, Chapter 9, from Ford Fuel Injection and Electronic Engine Control: How to Understand, Service and Modify, 1988-1993
Source: by Charles O. Probst via
Vacuum Gauge Diagnosis
Source: by
Vacuum Gauge Diagnosis - BEST!; Normal engine; Steady gauge 18"-20" at all speeds..." READ MUCH MORE
Source: by Craig U at