Ignition coils
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Super Moderator
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From: Maine, Virginia
Ignition coils
My question is very generic and could apply to any Ford truck but refers to my 2004 expedition. I'm asking here because this forum generates so much traffic and I'll actually get an answer.
I'm about to replace all 8 coils on my Expy. There is a low RPM mis at take off and sometimes it feels like a misfire during certain driving operations.
It's not significant enough to throw a code. However, my best mechanic feels that a coil(s) or boot(s) is / are failing and a full replacement would solve the slight misfire issues.
I changed the plugs 20K miles ago and I inspected the boots then. Like a dumbazz I didn't replace the boots like I should have.
Looking around on the different autoparts sites for coils, I'm coming up with names like MSD, Denzo, Delphi, Standard Auto as well as MC.
I don't want to spend the big bucks for MC coils. Even at rockauto they're about $41.00 each.
Knowing that the MC part is likely the best option, please steer me to a great option besides MC. Who makes the MC coils? It's likely one of the brands that I listed.
Any help and opinions are appreciated.
I'm about to replace all 8 coils on my Expy. There is a low RPM mis at take off and sometimes it feels like a misfire during certain driving operations.
It's not significant enough to throw a code. However, my best mechanic feels that a coil(s) or boot(s) is / are failing and a full replacement would solve the slight misfire issues.
I changed the plugs 20K miles ago and I inspected the boots then. Like a dumbazz I didn't replace the boots like I should have.
Looking around on the different autoparts sites for coils, I'm coming up with names like MSD, Denzo, Delphi, Standard Auto as well as MC.
I don't want to spend the big bucks for MC coils. Even at rockauto they're about $41.00 each.
Knowing that the MC part is likely the best option, please steer me to a great option besides MC. Who makes the MC coils? It's likely one of the brands that I listed.
Any help and opinions are appreciated.
Cargo Master
Joined: Feb 2007
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From: ME
Junior User
Joined: Jul 2017
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Your best bet is to use motorcraft boots first, then try coils next. The ecoboost guys have gone rounds a figured out that the motorcraft stuff is the ONLY replacement parts place. Sucks to pay the premium, but it’s reality.
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Super Moderator
Joined: Jan 2008
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From: Maine, Virginia
My time is too limited and valuable to fiddle with this twice.
Moderator
Joined: Jul 2011
Posts: 6,513
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From: Sioux Falls Area
My expedition is wearing 8 premium coils/boots from NAPA.
My "good guy" deal got them less than $50 each.
If you can wait, I'd order the motorcraft from RA. the only thing worse than a intermittent coil is a cheap replacement.
My thoughts....
My "good guy" deal got them less than $50 each.
If you can wait, I'd order the motorcraft from RA. the only thing worse than a intermittent coil is a cheap replacement.
My thoughts....
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New User
Joined: Jun 2017
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I replaced mine on my 2010 F-150 5.4L a few weeks back with Delco's. Got the entire set for 130.00 and since money at the time was tight, it was the best option. A mechanic friend of mine told me that once you pull the coil packs to replace them, so they don't start to give problems. It was his suggestion to replace the coil packs when I changed the plugs to prevent the down the road headache.
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Cargo Master
Joined: Mar 2002
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From: W (BY GOD) V
P.S.- (Fr. for I forgot to mention) Try the boots first. They should have been replaced with the new plugs.
Fleet Mechanic
Joined: Jan 2011
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agree....motorcraft..
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Super Moderator
Joined: Jan 2008
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From: Maine, Virginia
Are your coils part# DG508? > https://www.ebay.com/itm/New-FOR-Mot...9ZQI1w&vxp=mtr
5th Wheeling
Joined: Sep 2017
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Should you replace coils as preventative maintence at a particular mileage or only if a problem? we are coming up on 90k miles and runs fine, but mechanic says to replace spark plugs [1st time] and while he is in there says should repalce the coils?
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Super Moderator
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From: Maine, Virginia
The issue that i'm having is an erratic misfire between 45-50 MPH. I'm positive that a worn boot is causing this but I'm not going to pull the coils just to replace the boots.
So, I bought 8 Duralast coils from AZ with a lifetime warranty for $169.00 over Thanksgiving. I'll get them on soon.
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