miss when driving - Ford Forums

daktiner · 03-28-2009, 06:30

I have a 2001 F150 Supercrew 5.4L that when idle runs fine. It seems to shift ok but when I am driving down the road the engine seems to miss when I get to the 50 - 60 mph range. I thought I may have water in the tank, but I have been using stp every time I fill up. I appreciate any help given.

**jwko** · 03-28-2009, 21:59

If you suspect having water in the tank, use a fuel drier. STP won't help you much with a water ptroblem.

daktiner · 03-29-2009, 06:28

I am not familiar with fuel driers, is there any brands in particular that are better than others?

**jwko** · 03-29-2009, 15:11

Quote:

Originally Posted by daktiner

I am not familiar with fuel driers, is there any brands in particular that are better than others?

Heet is the only brand that comes to mind. I guess one is as good as the other, Isopropyl alcohol is the main ingredient.

va ford owner · 04-03-2009, 07:39

if you the 01 has individual coils most likely one or more of your coils is bad.get diagnostic on it and find out if any of your coils are misfiring.

thebear13 · 04-08-2009, 21:29

I agree, get a scan tool and see which cylinder has the misfire, and then try switching coils from the known mis to one with out. If the misfire moves to the cylinder that did not have the misfire before, you know it is a bad coil.