I have a 2000 F350 with the 7.3 diesel. In cold weather(below 30 degrees) the engine will rev to about 1200 - 1400 rpm during initial warm up. If I tap the break pedal it will drop down to normal level of about 800. It will stay there for a minute or so and then run back up to the 1200 level. This only happens in cold weather warm up. Any ideas?

Thanks
Eric C

Is this the first time you've experienced this problem? A lot of cars tend to idle higher in colder weather; 1200-1400 rpms really isn't anything to worry about. If it goes much higher you may want to look into it but I'd say leave it for now.

I had a 2004 F250 with the 6.0L Diesel.
It would do the same thing from the day I bought it. I figured it was to keep the engine temp up. I could actually watch the temp.. At normal it would idle fine. Then the temp would drop a little and it would idle up. Touch the brake and it would idle back to normal. It would do this even on long trips. I mainly noticed it when I stopped at a drive through for something to eat.