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Originally Posted by hartzell
97 5.7 suburban stopped died this morning. the ecm b fuse is blown and blows on contact with a new one. Removed the fuel pump relay and still cant get a new fuse in without blowing on contact. I assume that would mean its not the fuel pump circuit thats blowing the fuse. Where do I begin from here. The ignition seems to have been periodic cutting out, just for an instant. Runs fine for a hundred miles, then might instantly cut out from time to time then gets smooth again. Every once in awhile it might backfire as you drive it but then like someone throws a switch it clears up and runs fine for another hundred. I bought new wires,plugs,coil, cap and rotor to install today (probably needs it anyway-bought truck used 20K ago , wires look origianl because of #'s on them , 130K on truck) and started it up this morning to warm it up and it died after about 30 seconds and now I find the fuse blown as described above. what from here???? Can a bad ECM cause what ive been experiencing and now the blowing of the fuse???MG
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expose wires to pcm check for damage if none disconnect pcm connectors see if it still blows fuse... check connectors that go to pcm for green/black leakage of current... as you where having some ignition issues prior.. i would not do any replacing of parts until this is addressed....