i posted a thread about this problem w/ my truck.i havent been on for a week and now i cant find it in any topic.so i will try again.i have a 2002 f150 w/ 4.2 engine.i feel a slight hesitation in it when accelerating up the highway.if you push it harder you will also hear a popping from the engine.i already changed plugs and wires when i found a small hole in one of the plug wires which i thought was the solution to the problem.it drove fine for awhile after replacing the wires,but problem eventually came back.it seemed like when it rained it would occur more frquently then on a dry day.last week on a perfect day it did it so now i kinda baffeled.if anyones got an answer or suggestion i am glad to hear it. thanks.

 

I just changed out my plugs and wire boots the other day because of a simular hesitation problem. I also ended up having to replace one of my coil pack along with it. Sometimes they go bad as well and will help with the hesitation problem if replaced. They are expensive though and i dont really know if it would help the popping noise. You ever get a misfire code or anything?

 

I just posted in another thread about similar problems. Forgot to mention there that I had a bad problem with bogging on a rainy day, but it seemed to improve the next day when it was clear. Eventually, the issue got pretty consistently bad, regardless of the weather, but after several services, I'm still trying to figure it out and fix it.

 

the only code i got when running was a cylinder 3 misfire.that led me to the plug wire w/ a small hole in it.i since replaced the wires and plugs but the problem still comes and goes.

 

Coils

 

I agree. try replacing that coil. I had a misfire on cylinder 8 and that coil needed to be replaced. i did my plugs and boots just for maintanance but the coil was what was really giving me the problem.

 

I am also having this same problem. From getting it scanned at O'riellys it threw me 4 or 5 different codes saying that it's running lean in banks 1 and 2 and that the mass airflow sensor and 2 heated oxygen sensors need to be replaced. I'm waiting to see if this will fix the problem.

 

i did get a bank 1 lean code in the past but it has not come back.you think the coil pack can be the issue?i have one main coil pack for all 6 cylinders.

 

It all depends man, georges problem sounds like the o2 sensors

 

total fluke, but I happened to talk this up with a guy that I didn't know was a mechanic at first this weekend. He said that if one goes bad, the others should be replaced soon, as they will go bad as well in short order. I don't have a mechanics perspective to back up the story, but his explanation sounded reasonable enough. He said that when one goes bad, there will be extra current directed to the remaining coils, thus starting them on the burnout process. I don't know how believable this is, but it is the first reasonable explanation for what I have been trying to figure out for over 6 months.
I'm replacing all coils ASAP.