I have a 2000 F150, with the 4.6l. It has roughly 260000km. I finally logged the p0308 code. Problem is, it only "misfires" when it is cold out, and very intermittently. I had the problem last year off and on for about a month. Problem dissapeared, and hasn't happened for around a year. I never got a code last year, and am glad one showed up now.

I've already had a look at the coil, and spark plug. No moisture, corrosion(I changed the plugs out a couple months ago). Everything looks good. Swapped both the plug and coil to another cylinder, code did not follow. I have since replaced the fuel filter, and ordered a set of injectors. I'm assuming it has to be an injector, or fuel related since the problem didn't follow the coil and plug.

Is there anything else I should check while I wait for the injectors to show up? Keep in mind it only does it when its cold out (it has been -10 to -30celcius). And the problem is still intermittant.

I have searched a few other threads, most stating that it wasn't the coil/plug with no real outcome of what their fix was.

 

I need to learn to read.. You can get remanufactured injectors on e-bay for about $100 what kind of plugs do you have? migh want to do a compression test. you could swap injectors.

 

What I meant was I bought a set of remanufactured injectors off ebay. A set of 8 bosch injectors. Even with express shipping it will be another 3-5 days before I get them. And I had installed the motorcraft plugs.

 

you could swap an injector to see if thatts it.

 

Yeah, I will try doing that tomorrow. I just figured it would be a good idea to replace the injectors anyways. When it is missing, its not a constant miss either. Its almost a surging type of misfire. I'll probably replace the o2 sensors while I'm at it tomorrow as well. Just for the sake of changing them.

 

i had the same problem put new plug/coils on all and still happen. had a compression check done and was 70lbs, should be at 150 on my 5.4l the light is always on now but haven't got around to finding out where it leak is yet. good luck