how do you change the spark plugs on a 1991 q 45 infiniti
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 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.
0.35
.060"
.031 in
Sparks plugs are replaced by disconnecting the battery, removing the spark plug cable and boot, and by removing the old spark plug. Next put in the new spark plug, attach the boot and cable and reconnect the battery.
The first 3 spark plugs to the right are easy to change,the one on the left you have to loosen up the alternater to get to.