2000 Explorer won't start...

The classic symptoms of the IAC valve. Try removing it and cleaning it out with WD-40. If it still does not work, it might be time for a new one. It should be on top of the intake manifold on the SOHC V6 if that's the engine you have. I think it might be in the same location for the other engines, but I'm not sure.

NO!!!!! WD40 contains silicon... this is bad kharma for O2 sensors....

Jim, I doubt that WD40 contains silicon (which is "sand"). I do not even think it contains "silicone" which may be what you are trying to say, unless it is unlabeled as such. Steve

Here's what WD-40 website says. look where it says "What does WD-40 contain?"

Awesome. It worked! First thing I ever fixed with it. Thanks.

In light of mike's post, I stand corrected... however, we should tread carefully on grammar and such at times... A good portion of the world spells "colour" incorrectly as well as neighbour and endeavour..... I'll dig into my roots and also suggest that even more don't know how to spell tyre and gaol (tire and jail for the colonists).

Besides, I do pretty good for a grade 8 drop-out.. 8^)

You forget that both silicon and silicone are real words, and that they mean different things.

Silicon is an element, atomic weight 14. In its crystalline and highly purified form it's the stuff that computer chips are made of.

Siicone is a semi-organic polymer. Among other uses, its physiological inertness and physical properties made it a good candidate for augmenting some body parts -- until we learned better.

So it's not a question of spelling, but of chemistry at this time. Yet I have no clue how we got into this debate. Does any of the two have anything to do with Explorers?

I don't know, but all that matters is the original poster got his car started.

I had the same thing happened 4 weeks after I bought my 2001 Explorer. It failed to start at lunch time. It would turn over, and only start if I hit the gas, then it would shut off if I let off the peddle. I called the dealer and told them I had seen posts from searching around that it could be the IAC sensor. They towed it and replaced that, and it's worked fine every since. Now, a week later, I am getting a TIC from the motor when I turn on the Heat. Every 5-8 seconds it tics and the rpm's drop about 200 rpm. Any lower and it would stall. I posted about it in a simliar topic already posted. Any ideas, let me know.

It sounds like the A/C compressor is cycling, which is what it's suppose to do if you are using your defroster, but for regular heat it's not suppose to cycle, at least in my 99 XLT, unless they changed it for 2001. Are you using the floor heat only?