Idle RPMs

[French_Toast]

Ok, just a simple question. At idle what should a completely stock trucks RPM be, and how much should it fluctuate? Thanks

[Pullinpower7.3]

should be around 600 give or take 50rpm. some will flutter 25 to 75 sittin there. on mine its is pretty stable but I would say 20-30 r difference.

[Pullinpower7.3]

ok after a quick plug in of the good ol NGStar tester, it reads that desired idle rpm is 678. my truck idles between 620 and 700. fresh and hot off the road with the "factory ford" scan tool hooked up.

[French_Toast]

Ok thanks, I had noticed some fluctuation in mine, but it seems to be within that range

[999renville]

manual or auto? my auto idles at 1000. always has. should I be looking to lower it?

[French_Toast]

Mines an automatic.

[J0hnny]

Originally Posted by 999renville

manual or auto? my auto idles at 1000. always has. should I be looking to lower it?

isn't 1k too, but quite too high? mine is auto and she idles almost at 700...

[pipelayerjdh]

Originally Posted by French_Toast

Mines an automatic.

You may want to pull codes. You probably have a bad sensor or someone has added an idle mod sometime.

[scott3824]

What sensor could cause that?

Mine just started doing this when the weather got cold, if it sits warming up for a few minutes or longer the idle jumps to 1k ... besides the intake everything else is stock to my knowledge ...