Ford Pick-Ups/Expedition/Navigator 1997-2000

Ignition Timing



Periodic adjustment of the ignition timing is not necessary for any engine covered by this guide. If ignition timing is not within specification, there is a fault in the engine control system. Diagnose and repair the problem as necessary.

Ignition timing is the measurement, in degrees of crankshaft rotation, of the point at which the spark plugs fire in each of the cylinders. It is measured in degrees before or after Top Dead Center (TDC) of the compression stroke.

Ideally, the air/fuel mixture in the cylinder will be ignited by the spark plug just as the piston passes TDC of the compression stroke. If this happens, the piston will be at the beginning of the power stroke just as the compressed and ignited air/fuel mixture forces the piston down and turns the crankshaft. Because it takes a fraction of a second for the spark plug to ignite the mixture in the cylinder, the spark plug must fire a little before the piston reaches TDC. Otherwise, the mixture will not be completely ignited as the piston passes TDC and the full power of the explosion will not be used by the engine.

The timing measurement is given in degrees of crankshaft rotation before the piston reaches TDC (BTDC). If the setting for the ignition timing is 10 BTDC, each spark plug must fire 10 degrees before each piston reaches TDC. This only holds true, however, when the engine is at idle speed. The combustion process must be complete by 23° ATDC to maintain proper engine performance, fuel mileage, and low emissions.

As the engine speed increases, the pistons go faster. The spark plugs have to ignite the fuel even sooner if it is to be completely ignited when the piston reaches TDC. On all engines covered in this guide, spark timing changes are accomplished electronically by the Powertrain Control Module (PCM), based on input from engine sensors.

If the ignition is set too far advanced (BTDC), the ignition and expansion of the fuel in the cylinder will occur too soon and tend to force the piston down while it is still traveling up. This causes pre ignition or "knocking and pinging". If the ignition spark is set too far retarded, or after TDC (ATDC), the piston will have already started on its way down when the fuel is ignited. The piston will be forced down for only a portion of its travel, resulting in poor engine performance and lack of power.

Timing marks or scales can be found on the rim of the crankshaft pulley and the timing cover. The marks on the pulley correspond to the position of the piston in the No. 1 cylinder. A stroboscopic (dynamic) timing light is hooked onto the No. 1 cylinder spark plug wire. Every time the spark plug fires, the timing light flashes. By aiming the light at the timing marks while the engine is running, the exact position of the piston within the cylinder can be easily read (the flash of light makes the mark on the pulley appear to be standing still). Proper timing is indicated when the mark and scale are in specified alignment.

When checking timing with the engine running, take care not to get the timing light wires tangled in the fan blades and/or drive belts.


  1. Place the vehicle in P or N with the parking brake applied and the drive wheels blocked.
  3. Connect a suitable tachometer and timing light to the engine, as per the manufacturer's instructions.
  5. Remove the SPOUT (Spark Output) connector.
  7. Start the engine and allow it reach normal operating temperature. Make sure all accessories are off.
  9. Check that the idle speed is within the specified rpm range.
  11. Following the timing light manufacturer's instructions, aim the timing light and check the ignition timing. As the light flashes, note the position of the mark on the crankshaft pulley against the scale on the timing cover. Timing should be 8-12 degrees BTDC.
  13. If the ignition timing is not within specification, refer to ADJUSTMENT, in this Section.
  15. Install the SPOUT connector.
  17. Stop the engine and remove the tachometer and timing light.


5.8L and 7.5L Engines

If the ignition timing is not within specification, loosen the distributor hold-down bolt and carefully rotate the distributor in the correct direction to achieve the desired advance/retard required to correct the timing. Recheck the timing as you rotate the distributor and when the desired timing is reached, tighten the hold-down bolt.

Except For 5.8L, 6.8L And 7.3L Engines

If the ignition timing is not within specification, there is a fault in the engine control system. Diagnose and repair the problem as necessary.