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Gus, Okay, you guys, you have to promise not to laugh. I have a 1997 Ford Ranger with the 2.3 Liter, 4 cylinder engine. I think that probably the crankshaft position sensor on my little tiny truck does essentially the same thing as the crankshaft position sensor on your big trucks. It is a little magnetic pickup coil that mounts near the crankshaft pulley. It senses top dead center (or some particular number of degrees before TDC) on your number one piston. It uses that information to synchronize the fuel injection, (and ignition on a gasoline engine). You probably also have a cam position sensor that is used likewise to help determine if there is any lag between your cam timing and crankshaft timing, to enable the electronic control module to adjust for any lag. My Ranger actually has about a half a dozen sensors on it, all of which feed to the electronic control module which controls both my fuel injection and my ignition timing. I replaced my crankshaft position sensor recently, and the part cost less than $20.00 at AutoZone. Well, if this ain't right for your big ol' truck, somebody will tell us. Good luck, Tom in TN
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