Mercury Villager 1993-2000
Nissan Quest 1993-2000
While periodic adjustment is not necessary, ignition timing may need to be adjusted when the distributor has been removed for repairs, such as cylinder head removal, or when all other causes of an engine performance problem have been eliminated and the symptoms suggest an ignition timing problem.
When checking ignition timing, observe the following conditions:
- Apply the parking brake and be sure that the vehicle is in park.
- Start and run the engine at about 2000 rpm for about two minutes.
- Turn the engine OFF and disconnect the throttle position sensor harness connector, located at the throttle body between the intake manifold and air cleaner-to-intake mani