Quote:
Originally Posted by DJJSR
HOWEVER, that method of just tightening until it points in the right direction IS ABSOLUTELY WRONG. Sparkplugs have a torque specification. Tighten the plug to that specification and if it points in the wrong direction, get some indexing spacers.
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To build upon this point, the Insight has three cylinders. Each cylinder is designed to take one of 4 different spark plugs. Each plug has the same part number except for the last letter. Stamped into the block is an "A", "B", "C", or "D". That is the plug that goes in that cylinder. You have to order that EXACT plug, you can not mix them. If you do the car will run, but not as effectively as designed. Each plug (A, B, C, D) have their electrode in a different position in relation to the threads so that as you tighten to the specified torque, the electrode will face a specific way. I lucked out and each of my three cylinders take the same plug type (A), no worries about mixing up by accident. Not all Insights have the same plug for all cylinders.