Wonderful news. On a lot of older cars, the engine will not run with a missing signal from either the crank or cam sensor. Some GM V-6 engines are known to not start with either signal missing, but will continue running when a sensor fails while it is running. The crank sensor tells the Engine Computer when a piston is coming to top dead center. It's the cam sensor that tells the computer which piston is coming to TDC. On some GM engines, with a missing cam signal, the computer will guess which pair of cylinders to fire first during cranking. It has a 33 percent chance of guessing correctly, and if it does, the engine will start and run. If it guesses wrong, you have to turn the ignition switch all the way off, then try again with another 33 percent chance of being right.
I don't know how you figured this out, but I'm happy you did.
Wednesday, January 25th, 2017 AT 12:54 PM