The owners manual says .031, which is right for factory stock plugs. Using Autolite double platinums it's .044. Any less than .040 and your engine will misfire and set the malfunction light.
.88
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The red fill plug on a 2001 Daewoo Nubira is typically located on the transmission. You can find it on the top or side of the transmission casing, depending on the specific model and configuration. It is usually a threaded plug that you can unscrew to add transmission fluid. Always ensure the vehicle is on a level surface before checking or adding fluid.
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Remove the 4 screws holding the top cover. You can then get to the plug wires and the plugs.
Remove cover on top of engine,pull plug wires straight up.The spark plugs will be down in a hole for each cylinder.You need a spark plug socket and a long extention to reach them.
.044
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The 2001 Toyota Sienna spark plug gap is .023. Most spark plugs will be pre-gapped by the manufacture of the spark plug.
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The inside cover seal on your Valve cover gasket needs replacing. It's an easy fix. Just be sure to mop up the oil around the spark plugs. It's a good time to change your plugs also.
Give the spark plug boot a twist to free it from the spark plug then pull it off of the spark plug by the boot.