I have a 1997 Ford F-150 with 132,000 miles, 4.2L 6 cylinder engine. My truck keeps blowing the PCM fuse when I engage the ignition. The relay is fine. It used to finally turn over after changing the fuse 4 times, but now it will not turn over at all. I also have a check engine light that says the upstream O2 sensor is bad. I have no idea where to even begin with this problem. Any advice would be greatly appreciated.
Wednesday, May 9th, 2007 AT 7:37 PM