The easiest is through the fender wells. You can even take off the tires to get more room. It is the easiest way I found anways.
how do you change the spark plugs on a 1991 q 45 infiniti
To change the spark plugs in a 1991 Nissan Stanza, first, remove the ignition wires from the spark plugs, noting their order. Use a spark plug socket to unscrew the old plugs and replace them with new ones, ensuring they are gapped correctly. For the distributor cap, locate it on the engine, then disconnect the wires and unscrew the cap. Replace it with a new cap, ensuring that the wires are reconnected in the correct order.
There are four spark plugs on each side of your 1991 Chevrolet engine. The spark plugs will be near the bottom of the engine.
To access the spark plugs in a 1991 Jaguar XJS, first, remove the engine cover if equipped, which may require unscrewing bolts or fasteners. Next, locate the ignition coils or distributor, depending on the engine type, and carefully disconnect the spark plug wires. Then, use a spark plug socket and ratchet to remove the spark plugs from their respective holes. Ensure to replace the spark plugs with the correct specifications and reassemble the components in reverse order.
To change the Spark Plugs on a Previa (1991-1996) you have to remove the passenger front seat, lift the carpet and then you will find a cover on the floorplate that has to be removed. Once the floorplate cover is off you will see the engine. There is also a small cover over the spark plugs and wires that has to be removed. The 2.4 liter petrol engine uses small 16mm spark plugs and a small 16mm socket will be needed to replace the plugs.
Assuming it is getting fuel and you have no spark, replace the ignition module.
In the engine... If it is a a straight six. They run in a row. follow the spark plugs wires to them.
You only set the timiming for engines with spark plugs, and diesels don't use spark plugs.
The 1991 Mercury Marquis spark plug gap is .034. Most spark plugs will be pre-gapped by the spark plug manufacturer.
.031 in
0.35
.060"