Good morning, all. I've got a nuisance issue that I'd like some input on. I have a 2008 FX2 SCrew, 5.4 3V Triton. Within the past week or two, I've noticed that she breaks up a little bit when I have to heavily accelerate, or hammer down on the throttle. It doesn't feel like a transmission slip, but more like a miss in either ignition or fuel delivery. My fuel filter is fresh, FPDM was replaced this time last year (FoMoCo part), plugs were changed at 72K when I bought her but I'm up to 119K now. All coils are original, and she's never once thrown a code for the entire duration of my ownership. Upstream O2's are new. As well, my TB is cleaned regularly. I'm psychotic with maintenance, so I'm not exactly sure as to what could be my issue. Would anyone here like to chime in with any suggestions?

 

COP's ?

 

I was always under the belief that COP's don't really weaken. Either they work or they don't. I'm sure it wouldn't hurt to replace them, though...but I don't have $400 to spend on 8 new Motorcraft COP's. And if it's only one causing an issue, I sure as hell haven't a clue which one it is since this isn't throwing any codes.

 

I had a COP act a very similar way, it was always sporadic and sometimes would have a very short miss at idle. This lasted for like a year and then one day it just died, after replacement I had no more problems.

 

If that's the issue in my case, I wish it'd just die already so I could know which one it is and replace it. Haha

 

Were the COP boots and spring changed with the plugs?

I had a miss come back about 30k miles after replacing the plugs. Replaced the COP boots miss went away

 

You can test your coils with a voltmeter. Youtube has videos on how to do it.

 

That I did not. I know that they're cheap enough, so it couldn't hurt investing in the set of 8 and seeing if that helps. Good point, friend.

 

Here ya go.

 

Rock Auto has a set of 8 delivered to you for under $30

STANDARD MOTOR PRODUCTS CPBK240

They had the same mold marks as the OEM just a different part number molded in