Hey guys, A couple of months ago I did a procharger on my 2002 5.4 and it's been running great with one exception. Ever since I did regular copper plugs (gapped at .038) it has been shuddering at idle. Really hard to explain but it feels like the engine is missing randomly, but it never throws a code. It never did this with the factory platinums, but obviously platinum + boost = no no.

Advice?

 

I'm running the plugs for a 2001 lightning and i have no issues. when is the last time you changed your cops? are you on the FMU still or on fuel mods and a tune?

 

Still on the FMU setup, gonna do a tune in the spring. But I know that isn't causing it since it was fine at idle when it still had the stock plugs (yes I forgot to do the plugs for the blower, stupid me lol). Once I did the copper cores the thing started idling weird.

 

I run NGK TR-6 plugs

 

+1...i use it for nitrous because im not blown...

 

those are the same plugs i'll be switching to with the 3# crank pulley a lot of people run them with good results

 

I was running NGK TR6's on my Procharged 4.6 at 12psi with no problems and will be running them again in the 5.4 DOHC when I get the charger back on. GOOD PLUG!

 

Cool guys, thanks. I'm gonna order a set of those then. What do you guys gap them to out of curiosity?

And can someone give me a part number? Every time i search TR6 I see a copper core plug, unless that's the right one...

 

The TR6's are a copper core plug but they are resitor type plugs. As for the gap, I set mine to 0.32 - 0.35 but the bigger the better without spark blowout under boost.
Which copper plugs do you have in your truck now?

 

.032..wow..that seems kinda close..no?..i gap mine at .038 with a 175 shot

 

I currently have a set of autolite copper core plugs gapped to .038.

 

Im running TR6's gaped at .036 at around 12# of boost.

Wayne

 

Motorcraft copper plugs gapped at .040.

 

Whats the difference between the TR6 and the TR55....NGK says that the TR55 is the size that fits my truck???

 

hope that helps