Pass side closest to fire wall below alt.
Written under the hood on a placard and in your owner's manual.
On the '04 is .060 inches or 1.52 mm. Not sure if it's the same for every year.
If there is it will need to be flashed by buick to activate the plug
To access the rear spark plugs on a 2007 Buick Rendezvous, first, ensure the engine is cool and disconnect the battery. Remove the engine cover if applicable, then take off the intake manifold or any other components obstructing access to the rear of the engine. Once cleared, you can reach the rear spark plugs, removing the ignition coils and spark plug wires if necessary. Be sure to use a spark plug socket to extract the plugs safely.
The spark plug gap for a 2003 Buick LeSabre should be set at .060 inches. The best spark plug for this vehicle would be an Iridium plug.
It is the 13mm bolt on the front of the oil pan, just below the oil filter.
This vehicle uses Coil ON Plug ignition coils. So you have to remove the coil and the rubber boot to get to the spark plug
2000 Buick century gap for spark plug 3.1l
The spark plug gap setting on a 1994 Buick Century is .055 inches. A new spark plug will come preset from the factory and should not need adjusting.
The Spark Plug Gap.060 (In thousandths of an inch)
on an 05 its located on the output drive of the transmission. you can see the plug if you look behind the right tire and follow the driveshaft to transmission.
Spark plug diagram for '98 buck regal