It's exaclty what it sounds like. It measures how far the crankshaft has turned so the engine can deliver proper spark, open the valves, and deliver fuel. If it is intermittently going on and off, then the engine will run poorly. I've been working on a race car the last few months and when we trying out the engine, the sensor was getting a lot of interference and the engine wouldn't start. We solved that by sticking the sensor too far into the engine and breaking it. We now have a new system that prevents this from happening. Anyway, moving the wire that connects the sensor to the ECU around would solve our problem (it was getting interference from the spark coil).
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"I really like going fast. Just go off and meditate in the wind, you know? As corny as it sounds it works and feels good. It's a good way to just let the weight of the world off every once in a while...is this a big pose? I mean, yes this is a pose! I mean am I driving down the street to not get noticed in this thing? I mean rebellious is what this thing is I would say!!!" -James Hetfield
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