chiett

Does anyone know exactly a PO642 code is, and how to fix it?

bourgeois1269

Make sure your fuel cap is tight.

DnChris

It's an ECM issue it looks like...


http://engine-codes.com/p0642_ford.html

bourgeois1269

I just googled the code so that's why I said check the gas cap but normally If you google year, make model and code then it should help figure out what your problem is

whiteF1504x4

Just had that fixed it was a short in wiring. Check engine light on?

chiett

no CEL. where abouts was your short, my problem only happens when its cold after I run it and get it hot it runs fine, but when I first start it the fuel pressure is all over the place and low idle. I am thinking of checking the cylinder head temp. sensor