5.7L Hemi spark plug change

pilgrim6 · Feb 12, 2018

How similar to this (nice) write-up is the 2011 4.7? Pretty much the same procedure?

Hemi395 · Feb 25, 2018

pilgrim6 said:
How similar to this (nice) write-up is the 2011 4.7? Pretty much the same procedure?

Not really sure to be honest. I know the 4.7s have 2 banks of plugs that need to be changed at different intervals. The steps I outlined regarding the removal and reinstallation of the plugs with antiseize and dielectric on the boots should apply to a 4.7...

Gordinho80 · Feb 26, 2018

Damn! The rearmost coil on the pass side is a ***** to get to! Otherwise, the change just went relatively smoothly. Completed in an hour and a half.

Old plugs...

ramportin1 · Feb 26, 2018

Is the original plug link still good? they are listed as nickel and not copper

Ramnewbie · Feb 26, 2018

I don't know this for a fact, just heard it from someone else that got it from a sea foam rep. Run seafoam thru vacuum like a normal cleaning and let soak overnight, with engine cold spray a little deep creap around the plugs before extraction, no carbon issues tearing up threads. The specific vehicle they were talking about was a Ferd 5.4 with those crazy assed plugs, but wouldn't hurt the hemi either.

Sent from my XT1650 using Tapatalk

Hemi395 · Feb 28, 2018

Gordinho80 said:
Damn! The rearmost coil on the pass side is a ***** to get to! Otherwise, the change just went relatively smoothly. Completed in an hour and a half.

Old plugs...

View attachment 121578

Tell me about it! I was expecting the driver's side to be the worst because of the brake booster but it wasn't nearly as bad as the passengers side was

Hemi395 · Feb 28, 2018

Ramnewbie said:
I don't know this for a fact, just heard it from someone else that got it from a sea foam rep. Run seafoam thru vacuum like a normal cleaning and let soak overnight, with engine cold spray a little deep creap around the plugs before extraction, no carbon issues tearing up threads. The specific vehicle they were talking about was a Ferd 5.4 with those crazy assed plugs, but wouldn't hurt the hemi either.

Sent from my XT1650 using Tapatalk

Oh man those Ford 5.4 spark plugs. Who would've thought it was possible to mess up something as simple as a spark plug?

Gordinho80 · Feb 28, 2018

Hemi395 said:
Tell me about it! I was expecting the driver's side to be the worst because of the brake booster but it wasn't nearly as bad as the passengers side was

My left wrist is still tingling from the contouring required to get that coil off!

Burla · Feb 28, 2018

Gordinho80 said:
Damn! The rearmost coil on the pass side is a ***** to get to! Otherwise, the change just went relatively smoothly. Completed in an hour and a half.

Old plugs...

View attachment 121578

How many miles on those plugs? Do you use any fuel cleaners? Have to say from what I can tell gap and corrosion level looks good. Just the fact the sides are getting so corroded probably good to get them out just on that basis, bit looks like the plugs would still be operating good. Did you put any anti seize and/or di-electric grease when you put new ones back in?

Gordinho80 · Feb 28, 2018

Unknown mileage for those plugs. I just bought the truck last month, figured best to change regardless and know how old they were. Anti-seize and dielectric grease on new plugs.

Hemi395 · Feb 28, 2018

ramportin1 said:
Is the original plug link still good? they are listed as nickel and not copper

They are the correct plugs for 2009 to early 2013s but if you want to be 100% sure you're getting the right ones for your truck I would contact Benny at allmoparparts.com on here. He's awesome and gets back to you real quick

wyo.hemi · May 11, 2018

Has anybody used Bosch 6734 in a 13 or older? I have always had pretty good luck with Bosch.

Hemi395 · May 11, 2018

The 2013 and older trucks are very sensitive to what plugs are installed. I've had great luck with Bosch products as well but I've just seen to many posts on here and other forums about misfire codes being set from putting in plugs other than the Mopar ones. The 2013.5+ trucks are much more forgiving with plugs.

wyo.hemi · May 11, 2018

Hemi395 said:
The 2013 and older trucks are very sensitive to what plugs are installed. I've had great luck with Bosch products as well but I've just seen to many posts on here and other forums about misfire codes being set from putting in plugs other than the Mopar ones. The 2013.5+ trucks are much more forgiving with plugs.

Great thank you.

Hemi395 · May 11, 2018

David Bergh said:
Great thank you.

No problem good luck!

wyo.hemi · May 11, 2018

Hemi395 said:
No problem good luck!

Picked up a set of the NKG's off rockauto for 55 shipped, will be putting them in next weekend. Thanks for the right up.

wyo.hemi · May 16, 2018

Dumb question, did you leave the compression washer on?

Hemi395 · May 16, 2018

wyo.hemi said:
Dumb question, did you leave the compression washer on?

I'm assuming you mean on the plug? If so yes, that's part of the seal of the plug. When it bottoms out you can feel the resistance increasing as it compresses it and finally bottoms out.

Beastboy1989 · Jan 18, 2020

Has anyone tried the MSD Ignition coils ( https://shop.advanceautoparts.com/p...ire-57-61l-hemi-05-14-8-pack-55168/11376024-P ) before changing plugs to iridium?

jws123 · Jan 19, 2020

Just pulled the cheap autolite plugs out of my truck few days ago spent the $80 for the nkg oem ones and Boy what a diff... 200k miles and she runs smooth as hell now. I dont even feel the rumble when cold anymore and when sitting at a light hard to tell its even running lol def worth$$.

5.7L Hemi spark plug change

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