First time poster, long time stalker.

My 2006 F150 4x4 xlt 5.4 engine has started acting up on me and I need some help. There are no trouble codes, fyi. I have changed all spark plugs and coils. The picture in this post is from after I changed the spark plugs, but before I changed the Coils. I have, however changed the coils today and there is still practically the same things coming back up. I am completely lost.

As per the title of my thread, this only happens while backing up my mountain or driving between 40 and 50 miles per hour.


Torque Pro Image

 

You need to run the mode 6 data test on the torque app while you drive to see what cylinders may be misfiring depending on the misfire count it will not throw a code. Start there it could also be the transmission needing service as well.

Edit:

I see you misfire counts on cylinders 3 5 8 I would check out the coils on those cylinders if they are aftermarket also the spark plugs to make sure they are still good there were motorcraft spark plug batched that were defective.

 

I had to unhook the pcm to change the coil packs and of course the battery. Now nothing will show on Torque Pro for me. It did this last time and it took like 50 to 60 miles before all the monitors on torque pro started working again

 

"Stuttering" at 40-50MPH under light acceleration means you need to change the spark plugs. These trucks do odd things when the plugs need changing. Since you changed the spark plugs, you need to check to make sure the connectors are connected correctly, and plugs torqued correctly (26ft-lbs). Also, you might need to check your COPs. You only have to unplug the ECU when getting to the two right plugs

 

I put new coil packs on mine and that solved my stuttering. It only did it in overdrive

 

I agree. I have a OBD2 scanner and it showed me which cylinder was producing the misfire. Moved the coil pack and the trouble followed so isolation was easy. When you figure out which cylinder is doing it move the coil pack before the plug because it's easier. Even without a check engine light the obd2 should be holding a pending code if it's missing. Good luck.

 

Mine had no CEL, as most dont with this issue until it gets bad enough. I had 2 weak ones but went ahead and replaced them all

 

Yeah mine didn't throw a light either but I was able to check pending code to see a misfire on the cylinder.