Esteem Electrical Help

[snakester]

Just changed engines in a 2001 esteem, the swap went off flawlessly and the new engine ran great. Drove it around about a week, then when it was idling, it just quit. No noise, no sputter, just like turning the key off. I noticed there were no **** lights on the dash when the key was on, but yet the starter works fine. I found the 20 amp fuse under the dash for the ignition blown, and it blows every new fuse like a flashbulb every time I turn the key. I checked under the hood for any wire that may have gotten tangled in the axles, pullys, pinched, etc, but everything is normal. I suspect the problem is unrelated to the engine swap- my guess is the ignition switch, the guy who owns the car suspects the fuel pump. Any ideas? Has this happened to anyone else? Thanks in advance.

[snakester]

Got the problem figured out, and it was related to the engine swap. I bought a 20 amp breaker to put in place of the fuse until I could get the short fixed. Seems like the breaker let the circuit stay on for a few seconds, instead of the immediate pop of the fuse, which showed the short- the O2 sensor was shorted. Would have never gussed it ever, except the car's owner was looking under the hood when I turned the key, and saw a wisp of smoke come out of it before the breaker popped. I swapped the O2 from the other engine and it works fine. Got real lucky on this one. On closer inspection, looked like the junkyard engine's O2 got smacked a little in the wreck it apparently was in, or the sensor got smashed a little when it was being removed or shipped. In either case, got it working.