Ford Bronco And F-150 Links

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FORD BRONCO -> IGNITION; plugs/wires, distributors, MSD, firing orders; switch & ignition actuator rod, TSBs... -> Timing

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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

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Depiction; The engine coolant temperature sensor is threaded into the heater outlet fitting or cooling passage on the engine and detects the temperature of the engine coolant and sends this information to the ECA (Electronic Control Assembly). The sensor signal is used to modify ignition timing, EGR flow and air/fuel ratio. - 80.6 MB pdf
Source: by Ford fordinstallersupport.com

Adjustment in a 94 5.0; part of his overall Ignition System Upgrade
Source: by sewiv (Sandy) at FSB

Adjustment in Duraspark III
Source: by horsepuller at fte

Adjustment in Ford EFI Engines
Source: by Doomsmith & sackman9975 (Scott) at FSB

Adjustment in Ford EFI Engines
Source: by sackman9975 (Scott) at FSB

Adjustment in Ford EFI Engines - "All TFI systems are timed in the same manor. The engine must be brought up to operating temperature, and must be idling within spec. With the engine off the SPOUT connector must be removed. The SPOUT connector is a yellow wire near the distributor that either pulls apart with a wire connector, or has a little block that is removed (much like a spade fuse). This connector, or block stops the PCM from advancing the timing so an accurate base timing can be tested (with the SPOUT plugged in, base timing could be off as much as 10 degrees). Connect a timing light as usual, (+) and (-) leads on the battery, and the pickup connector on the #1 cylinder’s spark plug lead. Mark off 10 degrees (unless the vehicle emission label says otherwise) wherever it is located on this vehicle (often on the crank shaft pulley, or under a rubber boot at the top of the transaxle). Start the vehicle and check timing. Adjust the distributor as necessary, and reinstall the SPOUT connector..."
Source: by broncoii.org

Adjustment in Ford EFI Engines; MIESK5 NOTE; Spark timing that is retarded from specification may increase exhaust gas temperature and shorten catalyst life. Refer to the following procedure for service details. a. Check spark timing. Check base timing with spout disconnected. Set base timing to the specification on the vehicle emission decal. b. Check computed timing with spout connected. NOTE: COMPUTED TIMING IS EQUAL TO BASE TIMING PLUS 20° BTDC ± 3°.
Source: by Ryan M (Fireguy50) at fordfuelinjection.com

Adjustment pics in a 94 5.0; part of his overall Ignition System Upgrade
Source: by sewiv (Sandy) at SuperMotors.net

All "Ford 460 blocks manufactured between 1973 and 1987 were 8 degrees retarded in order to meet emmission requirements"
Source: by Cloyes Gear & Products, Inc.

Detonation (or Pinging); "...Check for over-advanced ignition timing. Too much spark advance can cause cylinder pressures to rise too rapidly. If resetting the timing to stock specifications doesn't help, retarding the timing a couple of degrees and/or recalibrating the distributor advance curve may be necessary to keep detonation under control. A knock sensor can usually be tested by rapping a wrench on the manifold near the sensor (never hit the sensor itself!) and watching for the timing change while the engine is idling. If the timing fails to retard, the sensor may be defective -- or the problem may be within the electronic spark timing control circuitry of the computer itself. To determine the cause, you'll have to refer to the appropriate diagnostic chart in a service manual and follow the step-by-step test procedures to isolate the cause. Sometimes a knock sensor will react to sounds other than those produced by detonation. A noisy mechanical fuel pump, a bad water pump or alternator bearing, or a loose rod bearing can all produce vibrations that can trick a knock sensor into retarding timing. The Exhaust Gas Recirculation (EGR) system is one of the engine's primary emission controls. Its purpose is to reduce oxides of nitrogen (NOX) pollution in the exhaust. It does this by "leaking" (recirculating) small amounts of exhaust into the intake manifold through the EGR valve. Though the gases are hot, they actually have a cooling effect on combustion temperatures by diluting the air/fuel mixture slightly. Lowering the combustion temperature reduces the formation of NOX as well as the octane requirements of the engine. If the EGR valve is not opening, either because the valve itself is defective or because its vacuum supply is blocked (loose, plugged or misrouted vacuum hose connections, or a defective vacuum control valve or solenoid), the cooling effect is lost. The result will be higher combustion temperatures under load and an increased chance of detonation. READ MORE.."
Source: by Bob at misterfixit.com

Distributor Overview, Wiring Diagram & Parts Break-Out Diagram in 92-96; "NOTE: Disconnecting the start wire at the starter relay with the key on will cause the TFI-IV ICM to revert to start mode timing after the vehicle is started. Reconnecting the start wire after the vehicle is running will not correct the timing. Use the ignition key only to start the vehicle for adjusting base timing."
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net