Just changed all my spark plugs just wonder If I should replace my coil packs to complete a tune up

 

How many miles on them? I would not change them unless I suspected one was bad. They last many miles.

 

What year, what engine, and how many miles?

 

2005,5.4,150,000

 

I wouldn't replace the coils but I'd probably replace the boots. They are available separately.

 

^^^ X2.

Napa has high-quality Belden boots ( complete with springs ) fer ~ $4 a pop.

Don't fegit to apply dielectric properly or it will all be fer naught:


The proper way to apply dielectric? That would be this - Courtesy of Jbrew and 88Racing:


Dielectric application:

1. Grease the plugs ceramic before install. This assures proper seat. Without it, the COP boot may buckle.

2. Pull the boot, then give the spring a couple tugs to make sure the spring to coil blade connection is secure.

3. Grease the entire inside of boot to protect against moisture and to focus coil pulse to the spark plug. Without it, pulse jumps, etches and leaves carbon trails inside of boots. Boots become weak and can deform.

4. Install the boot over the spring and onto the coil. With a small screw driver or curved pic, pull the spring from the end of the boot approximately one-half-inch. Slide the screw driver across the spring, keeping it from recoiling back into the boot.

5. Clean grease from spring end with a grease cutting agent. Lacquer thinner or brake cleaner works best.

6. Release spring so that it recoils back into the spark plug boot.

7. With a small brush or finger, grease the top seam of the boot.

8. Install coil.

Good luck
MGD

 

Just a quick FYI, We have the OEM boots for $6.44 each and OEM coils for $50.60 each.

http://www.tascaparts.com/oe-ford/3l...r=3l3z12a402ba

http://www.tascaparts.com/oe-ford/3l...tr=3l3z12029ba

-Steve

 

Original OEM Ford parts for the win. They fit better and are generally of higher quality than some of the aftermarket stuff. YMMV.

Bob

 

Belden is OEM quality.

 

Hope you fellas don't mind if I jump in. I recently changed the plugs in my 05 f150 5.4. Now it runs worse than it did before I changed the plugs. Should I change the boots and springs or the ignition coils or all of the above?

 

Hey.

I don't mind, but others might.

Ye already gots an ol' Thread on the subject: https://www.f150online.com/forums/v8...-skipping.html

As fer yer question - I always recommend a complete boot/spring replacement whenever plugs are R&R'd. Otherwise its an incomplete job in my view.

After all of that, and you STILL get misfire codes ( and DID you pull those codes? If so post 'em ), replace the offending COP ( ideally, do them all once the problematic cylinder(s) is found.

If it still misbehaves, report back, as you then need to go deeper.

Don't know if you have seen this or not (dint check all yer verbiage):

==> https://www.f150online.com/forums/v8...ram-07m08.html

^^^Applies to yer model year & engine - behooves yall to get 'em checked.

 

Not trying to knock Belden specifically but virtually all aftermarket parts claim to meet or exceed OEM quality but that's rarely the case.

Motorcraft coils in particular seem to far outperform all aftermarket brands including "high performance" variants which is why when you look at fast, high powered Mustangs, Lightnings etc. they virtually all run OEM coils.

-Steve

 

I wasn't talking about Belden coils, just Belden boots.

 

That's right, here's why. Actually, it's Motorcraft and Visteon Coils. Visteon was one of Fords coil suppliers (COP ignition coils) for more than a few years. Both share the same builds and thermal protection to Ford specifications. About Visteon, coils that were made here are now made in Central Europe, - Hungary to be exact and are still made to Ford Specifications. They can be hard to find, - best place for those are FleaBay or the Amazon.

The two brands mentioned above haven't had any competition for years.

All other COP system coils (aftermarket), even the larger companies- import coils from china and put their color or sticker on them. The bad, - these coils use single wire build magnets and have poor frequency performance (RFI). Also, they lack the thermal protection Motorcraft and Visteon COP system coils have. One little surge can hurt them, shearing enough turns causing low grade misfires to start, then eventually complete failure.