Ford Bronco And F-150 Links - 6 Cylinder

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FORD BRONCO -> ENGINE & COOLING; swaps, specs, snorkels, vac. diagrams... -> 6 Cylinder - also see Swaps

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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 http://replay.waybackmachine.org/ to search for the new archived copy

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4.9L Engine Knocking on Cold Start TSB 95-08-08 for 84-95 Bronco, F Series & Econoline

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.

Engine Hesitation/Surge with No DTCS in 5.0 & 5.8 Engines & with DTC 179 in 4.9 Engines TSB 95-2-10 for 91-92 Bronco & 91-94 F & E Series

General Engine Repair Practices & Service Tips TSB 92-25-2 for 88-93 Bronco, Aerostar, Econoline, F Super Duty, F-150-350 Series, Ranger; 88-90 Bronco II; 91-93 Explorer, etc.

New Longer Main Bearing Cap Bolts & Studs TSB 93-25-11 for 4.9L in 93-94 Bronco, F Series & Econoline

Oil Pan Sealing TSB 89-01-15 for Pre-'87 4.9L in 88-89 Bronco, E & F Series

Popping/Creaking TSB 97-03-10 for 80-96 BRONCO, F-150, F-250 LD 1980-97 F-250 HD, F-350 1988-97 F SUPER DUTY, F-47

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240-300 (4.9L) Big Six Performance Forum
Source: by Ford Six Performance at fordsix.com

300 (4.9L) Feedback Carbureted Problem Areas in 84-85; "...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 aircarecolorado.com via web.archive.org

300 (4.9L) Incorrect Timing in 84 Ford E & F trucks & Bronco; "...It's been reported that a number of 1984 Ford E & F trucks and Bronco vehicles with the subject engine may suffer from timing that is off by more than 4°, thus resulting in poor performance. The reason may be that the vibration damper bonding may have slipped. The figure below will help you to determine the correct location of the timing mark. Do no, however, mistake the monolithic notch for the timing mark. the monolithic notch is located 180° from the keyway..."
Source: by S & S Rebuilt Engines Co. rebuiltautoengines.com