SP542 Thread

[eclou]

Does this do anything to the stock truck or only noticeable when tuned?


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it smoothed out my truck when it was stock tune

 

[Sledgehammer]

My truck was on stock tune until recently and it had a hesitation from the first day i picked it up from the dealer. The hesitation is gone now. Honestly i probably could have gapped the stock plugs down and achieved the same affect but the plugs were only $50, super easy to install and now that my truck has a JB4 adding extra boost running a cooler plug is fine.

 

[xrocket21]

I wonder if these hesitation issues are something related to a poor connection to the coil pack or something, and simply the process of installing new plugs is correcting something else?

 

[FatBuoy]

I tried this. And it worked. I've had the hesitation/surge thing since it was new. Should I have taken it to the dealer? Probably. But I guess over the year I just got used to it. Put these plugs in because of this thread, and gone. I left the gaps as they came.

 

[FordPerf Addict]

I tried this. And it worked. I've had the hesitation/surge thing since it was new. Should I have taken it to the dealer? Probably. But I guess over the year I just got used to it. Put these plugs in because of this thread, and gone. I left the gaps as they came.

Stock?


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[FatBuoy]

Stock?


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Yep! Pedal Commander, only.

 

[xxaarraa]

I threw the 542s in at 28k miles and yes, truck feels peppier and a bit more responsive. All stock.

 

[FordPerf Addict]

I threw the 542s in at 28k miles and yes, truck feels peppier and a bit more responsive. All stock.

Wow I’m surprised that a plug change can do this. Not sure why ford doesn’t change their plug specs ?

Any long term concerns for these plugs ?


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[Edbert]

Do these amazing plugs require the "weep hole" mod for the stock tuned engine?

Only the seven liter versions.

 

[BendSprinter]

Just did mine because at $36- from O’Reillys can’t really go wrong. Truck has 12k miles / stock tune and for me I didn’t notice any smoothing, pep, or anything else better than before changing. The old plugs looked more worn that I would have expected at 12k miles but otherwise - ehh. If anything I was so hyper sensitive to stumbles and looking for improvement I noticed more roughness than normal. I am sure just in my mind.

Didn’t check the gap on the originals.