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2003 GMC Sierra 1500 Question: 2003 Sierra with 4.3L engine turns over but doesn't start.

 

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Frank.C, Pineland, TX, November 17, 2013, 17:26
 Rookie

This started after trying to determine why the battery would sometimes go down overnight. Had pulled the fuses and relays one at a time and replaced looking for a short. After this it now only turns over but doesn't start up. I did notice that the steering column doesn't lock any longer. Also by accident inserted the key for my 2006 Silverado and it turned the ignition switch. Could this be a problem with the Passlock? The fuel pump comes on when the ignition is turned on for about 3 seconds and goes off.

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