Switching fuel brands and octane levels can be detrimental to performance and economy. To keep detonation to a minimum, yet still allow you to operate the vehicle at the correct timing setting, use gasoline of the same octane at all times. Reconnect the timing light and retard the distributor 1-2 degrees (clockwise) Road test the vehicle to ensure detonation is gone.ġ7. If you hear the engine pinging, the ignition is too far advanced. Drive the vehicle and listen for detonation, or “pinging.” Detonation will be most noticeable when the engine is hot and under load (climbing a hill, accelerating from a stop, towing). Has changed from its correct setting, readjust it.ġ6. Older vehicles use a distributor that has spark plug cables sprouting out in all directions. Rev the engine a few times then allow the engine to idle. In a gasoline engine, ignition timing sends an electric current to each spark plug at precise time intervals and in a predetermined sequence (diesel engines don’t have spark plugs). Disconnect the timing light, reconnect vacuum hose on distributor or remove jumper terminals, depending on which method you used.ġ5. Restart the engine and re-check the timing to make sure the marks are still aligned.ġ4. Try not to turn the distributor while tightening the nut.ġ3. Shut off the engine and tighten the distributor lock nut. Start the engine and slowly rotate the distributor until the timing marks are aligned.ġ2. Loosen the distributor lock nut until the distributor can be rotated, but not too loose.ġ1.
On early versions of the 22RE (1984-1986 Approx.) the plug is above the driver's side fender well.ġ0. On some models, as indicated by the emissions tag on the hood, you must disconnect and plug the distributor vacuum advance hose (carbureted applications), or for EFI motors, plug in a jumper wire between terminals TE1 and E1 on the diagnostic port. Assuming the engine is in good mechanical condition. Be sure the air conditioning is turned off. LESSON/INFORMATION: Ignition timing is the single, most critical adjustment for a gasoline engine. Allow the engine to reach normal operating temperature.NOTE: Stay clear of all moving engine components during this step! To locate the notch, it may be necessary to have an assistant bump the motor over with the starter to rotate the crankshaft.
Locate the timing notch on the pulley and mark it with a dab of paint or chalk (White-Out works great) so it will be visible under the strobe light.To locate which mark the notch in the pulley must line up with for the timing to be correct, count back from the zero mark the number of degrees BTDC (Before Top Dead Center) noted on the emissions label. Locate the timing plate on the front of the engine, near the crank pulley.Some special tools will be required for this procedure. The proper ignition timing setting for your vehicle is printed on the emissions label located on the underside of the hood.Connect a tachometer according to the manufacturer’s directions and make sure the idle speed is correct.Before attempting to check/adjust the timing, make sure the air gap is correct between the distributor rotor and signal generator.
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