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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 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
Select A Link:
240-300 (4.9L) Big Six Performance Forum
Source: by Ford Six Performance at
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 via
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.
300 (4.9L) Oil Pressure Loss, Bronco F Series & E series, Engines Built On August 1, 2 & 3, 1983 due to mis-machined camshaft journals
Source: by S & S Rebuilt Engines Co.
300 (4.9L) Parts Break-Out Diagram; Internal & External
Source: by Steve83 (Steve, That dirty old truck) at
300 (4.9L) Rebuild in a 78
Source: by chebbykiller (Big Black, The Bronco) at
300 to 351M Swap pics in an 83
Source: by Charles F at
Bearing, Thrust Washer & Rod Sets, Federal Mogul Specs, Bronco & Ford, many engines and years
Source: by Federal-Mogul
Casting Numbers 200, 250, 300 (4.9)
Source: by Ford Six Performance
Casting Numbers Overview & Legend from 40 to 80's; GREAT INFO!; such as; It would read E for the decade (1982); T for All truck 1958-65; light and medium truck including [b]Bronco 1974-82[/b]; light truck and Bronco I 1983-later; E (probably) for Engine Engineering; Powertrain and Chassis product Engineering
Source: by via
Casting Numbers Overview & Legend; Good Stuff, up to 90's
Source: by
Connector Location in Engine Bay Diagram in a 91 4.9L
Source: by Ford via Chilton
Connector Location in Engine Bay Diagram in an 92-93 4.9L
Source: by Ford via Chilton
Connector Location in Engine Bay Diagram in an 94-95 4.9L
Source: by Ford via Chilton
Engine Bay Diagram in 87-88 4.9L; #2
Source: by Ford via Chilton
Engine Bay Diagram in an 87-88 4.9L; #1
Source: by Ford via Chilton
Engine Bay pics, in an 81 300 w/4 barrel carb installed, less some vacuum lines
Source: by AbandonedBronco (Spartan) at
Engine Codes in an 82
Source: by Ford via miesk5 at Ford Bronco Zone Forums
Engine Codes in VIN Decoder Chart for 81-86 & 87-96 Bronco & Ford Trucks BEST!
Source: by
Engine Conversion Kits for Bronco & Ford Trucks (sales catalog w/pics & descriptions)
Source: by L&L
Engine Knock at start-up may be traced to insufficient oil at the engine bearings caused by oil drainback from the Oil Filter (TSB 95-8-8, April '95); Buyer's Alerts for 80-96 Ford F-Series & Bronco
Source: by
Engine oil leaks are sometimes improperly diagnosed as transmission pump seal leaks. "The following areas of possible leakage should also be checked to determine if engine oil leakage is causing the problem. Leakage at the valve cover may allow engine oil to flow over the converter housing or seep down between the converter housing and block causing oil to be present in or at the bottom of the converter housing. Oil plug leaks will allow oil to flow down the rear face of the block to the converter housing. Leakage at the crankshaft seal will work back to the flywheel, and then into the converter housing. Leak Check Test with Black Light Oil soluble aniline or fluorescent dyes premixed at the rate of 2.5ml (1/2 teaspoon) of dye powder to 0.24L (0.5 pint) of automatic transmission fluid have proven helpful in locating the source of fluid leakage. Such dyes may be used to determine whether an engine fluid or transmission fluid leak is present, or if the fluid in the transmission fluid cooler hose leaks into the engine coolant system. An ultraviolet light must be used to detect the fluorescent dye solution. " from 1996 Bronco with E4OD Automatic Transmission Workshop Manual
Source: by Ford via miesk5 at Ford Bronco Zone Forums
Engine Swap Fact Sheet
Source: by EPA
FORD PICKUP TRUCK RED BOOK, 1946-93 Model Year Including Bronco, Ranger, etc. Overview w/Changes, Some Years w/Pics, GVW, Body, Engine, Transmission & Rear Axle Codes, Exterior Body & Interior Trim Color Codes, MSRP, Optional Equipment & Prices; Appendix A contains Overviews & Examples of; Warranty & Rating Plates, Build Date Stamp, Casting Dates & Manufacturing dates, Sheet Metal Date Codes, District Codes (DSOs), Assembly Plant Codes & Production Date Codes. Also includes F-SERIES TRUCK PRODUCTION FIGURES for 1946-79 including Bronco for 78-79; READ A LOT HERE! MIESK5 NOTE; site is down now & Internet Archive does not have an archived copy of each section; will leave Link in here in case site comes back
Source: by Peter C. Sessler via
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.
Source: by Ford via
General Engine Specifications in 96 Bronco & F-Series from 1996 All F-150, F-250, F-350, F-Super Duty and Bronco Vehicles Equipped with 4.9L, 5.0L, 5.8L or 7.5L Gasoline Engines, & 7.3L Diesel Engines Workshop Manual
Source: by Ford via
Head Bolt Torque Specs, Bronco & Ford
Source: by Federal-Mogul
History of the Ford Inline Six
Source: by AzCoupe
Source: by
Low or Erratic Oil Pressure Readings Repair Tip in 87-88 Bronco & Ford Trucks w/ 4.9, 5.0, 5.8, & 7.3
Source: by Bob R at
New Longer Main Bearing Cap Bolts & Studs TSB 93-25-11 for 4.9L in 93-94 Bronco, F Series & Econoline
Source: by Ford via Steve83 (Steve, That dirty old truck) at
Piston, Ring, Rod & Bearing Specifications, Bronco & Ford
Source: by Federal-Mogul
Removal Instructions
Source: by Paul E at
Removal Tips
Source: by JKossarides ("The Bronco", Jean) at FSB
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
Weights, Ford & many Makes
Source: by