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.
I tested f24, f30, and the MAF red wire. All three have power with the ignition in the on position.
Any advice would be greatly appreciated.
have the same problem?
Wednesday, May 9th, 2007 AT 7:37 PM