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PATS stands for Passive Anti Theft System... it stops the engine from starting when it doesn't pickup the key transponder chip... but the module can go bad. I had mine reprogrammed to erase and bypass the PATS and it starts every single time now!!

Fixed the PATS PROBLEM!!!! James Henson @ Hensonperformance.com out of Hueytown, AL was able to help me! This guy knows what he's doing when it comes to this gremlin. With just a few mins on the phone, he was able to tell me, yes, I more than likely had a PATS problem, and that he could erase...

Theft light blinks rapidly when key on, engine off; will not crank. SOMETIMES!!! Other times, key on, engine off; Theft light goes off as all indicator lights do, and it cranks right up and runs fine! In the process of tracking this problem down, I have replaced plugs, wires, cap, button...

The check engine light does not come on at any time, other than key on, engine off, as do all indicator lights, then it goes right back off with the rest of them. I just grabbed my users manual, tracked down the PCM relay, took it out, scratched the surfaces of the prongs, and reinserted it...

yes, it turns over and over, but is a dry spin...just now, I went out to crank it, and same thing. However, I just now noticed something I'd never noticed before. When key is on, engine off, I noticed the "Theft" light blinking very fast...I've seen brief mention of that somewhere... do you...

@ Dave 1955, yes it turns over but will not start...and just to mess with my head a little bit more, as soon as I posted this last night, I went out to it, and it cranked fine 6 times in a row!!! I have not looked at any wiring by the door for frays or crimpage, but I'll check that. bandit11...

ughhh....more problems!!! So I put in a new relay, and it worked fine for a day, then it started having its spells again where it wouldn't crank at all. So, I tested power to the fuel pump on the female plug, read 10.8 volts every time with key on, engine off. And again, sometime it would...

Well, I believe it was the relay for the fuel pump after all!! As soon as I pulled it off I noticed alot of corrosion built up on it and cleaned it with a wirebrush, stuck it back in, and it fired right up. Just to be sure, I'll go and get a new one tomorrow. But, as of now, she is cranking...

Alright!! Good info! I'm going now to try these things and see what happens! I'll let you know how it goes! Thanks!

I have a 2000 Explorer XLT. Last year, at 145,000 miles, I had the engine completely rebuilt, to factory specs, nothing fancy. I just had the front end completely rebuilt, new tune-up, tires, etc. I have tried to maintain this truck as it is usually very dependable. Recently, it is having an...