Finally changed plugs.
Thread Starter
|
Senior User
Joined: Dec 2009
Posts: 234
Likes: 0
Finally changed plugs.
With 94,000 on the clock I got out and changed the plugs on my 99 f250 V10 today. I have to say this job was not near as bad as I had imagined. The rear plug on the passenger side was a little tricky but after removing a small bracket I had very little trouble getting it changed..
The old plugs were worn quite a bit but none were fouled completely (I did have a slight miss at idle). For plugs I went with Motorcraft Platinums I did notice the new plugs were threaded higher than the factory plugs but they still seated at the same depth....
I also changed the COP boots along with the springs as I changed the plugs. The springs I also noticed were made a little different but the combo fixed my slight miss and I hope helped with fuel mileage( 9mpg in town, 13.5mpg highway).
The old plugs were worn quite a bit but none were fouled completely (I did have a slight miss at idle). For plugs I went with Motorcraft Platinums I did notice the new plugs were threaded higher than the factory plugs but they still seated at the same depth....
I also changed the COP boots along with the springs as I changed the plugs. The springs I also noticed were made a little different but the combo fixed my slight miss and I hope helped with fuel mileage( 9mpg in town, 13.5mpg highway).
Thread Starter
|
Senior User
Joined: Dec 2009
Posts: 234
Likes: 0
As for mpg I have high hopes (as always) and honestly expect a small gain but only time will tell... I will try to update after a couple tanks....
I also changed the fuel filter this morning but I do not feel it will effect anything because the old filter flowed fine, I just changed it because I recently purchased the truck and didn't know how many miles was on it...
If I get a chance (maybe tomorrow) I will take a few pictures of the old plugs+COP boots and post if anyone is interested...
Posting Guru
Joined: Oct 2009
Posts: 2,066
Likes: 4
From: Rogue River, Oregon
I'd be interested in seeing them. My '04 has around 83K on it and I'm thinking of swapping plugs soon, but it runs so good and gets good mileage (14-15 freeway, 12.5 combined) that I may just let it go awile.
Thread Starter
|
Senior User
Joined: Dec 2009
Posts: 234
Likes: 0
Here is a picture of the old plugs and a picture of the old cop's. The plug gap had grown over .060 and was an angled wear. The COP's are not hard and cracking but they are stretched where they attach to the plug..
Posting Guru
Joined: Oct 2009
Posts: 2,066
Likes: 4
From: Rogue River, Oregon
The electrodes and ground straps actually look good. Worn, but at least uniform and the right color, but what's up with the gunk above the hex? Some look like they've been dunked in grime.
Trending Topics
Cargo Master
Joined: Jan 2008
Posts: 2,566
Likes: 18
From: The Great White North!
Probably had water sitting in there at some time or other and rusted a little.
That is why you should put some dielectric grease on the boot connections, and on the boot where it seals against the outer side to help keep the water outta there.
<input id="gwProxy" type="hidden"><!--Session data--><input onclick="jsCall();" id="jsProxy" type="hidden">
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Cargo Master
Joined: Jan 2008
Posts: 2,566
Likes: 18
From: The Great White North!
Mud and guts,
have you checked the air filter, and might as well clean the MAF sensor, and while in there check the throttle body. After my purchase I cleaned those as well, and after leaving the battery unhooked for a bit to reset the pcm she seemed to have a better pedal response. Not that it was bad, just better.
have you checked the air filter, and might as well clean the MAF sensor, and while in there check the throttle body. After my purchase I cleaned those as well, and after leaving the battery unhooked for a bit to reset the pcm she seemed to have a better pedal response. Not that it was bad, just better.
Thread Starter
|
Senior User
Joined: Dec 2009
Posts: 234
Likes: 0
Mud and guts,
have you checked the air filter, and might as well clean the MAF sensor, and while in there check the throttle body. After my purchase I cleaned those as well, and after leaving the battery unhooked for a bit to reset the pcm she seemed to have a better pedal response. Not that it was bad, just better.
have you checked the air filter, and might as well clean the MAF sensor, and while in there check the throttle body. After my purchase I cleaned those as well, and after leaving the battery unhooked for a bit to reset the pcm she seemed to have a better pedal response. Not that it was bad, just better.
Thread Starter
|
Senior User
Joined: Dec 2009
Posts: 234
Likes: 0
Probably had water sitting in there at some time or other and rusted a little.
That is why you should put some dielectric grease on the boot connections, and on the boot where it seals against the outer side to help keep the water outta there.
<input id="gwProxy" type="hidden"><!--Session data--><input onclick="jsCall();" id="jsProxy" type="hidden">
That is why you should put some dielectric grease on the boot connections, and on the boot where it seals against the outer side to help keep the water outta there.
<input id="gwProxy" type="hidden"><!--Session data--><input onclick="jsCall();" id="jsProxy" type="hidden">
X2
There was still moisture around and inside some of the cop's when I removed them..
Mountain Pass
Joined: Mar 2009
Posts: 158
Likes: 46
Helped my brother in law change his on a 2001 (122,000miles) last weekend after his blew one out. He said it sounded like a blow out, or throwing the tread off a tire. The gap on his were close to .100, it also went better than expected. Plugs and boots looked almost identicle to yours. Now I think we will do mine soon (89000 miles) 2004.
Elder User
Joined: Jan 2003
Posts: 851
Likes: 5
From: On top of a big hill...
Just changed mine too...
I just changed my plugs for the first time as well at 80200.
Used Autolite platinums. Like mud-and-guts the job wasn't as bad as I'd heard and I only had trouble with the last two on the passenger side. Tricky getting a torque wrench in there!
The old plugs were all uniformly fouled around the electrodes but not rusty at all.
The coils and boots were in good shape, I wiped them with a damp rag while I had them out and blew the holes out with an air compressor before I loosened the old plugs.
So far the only thing I definitely noticed is that the engine fires up quicker. I noticed tha right off the bat. Don't know if it has helped mileage yet.
Aside from those two on the passenger side, it's a 1 hour job! I'm glad noone came down my driveway while I was working on those last two plugs. I was lying face down across the engine compartment uttering profanities. Must've looked kinda weird!
Used Autolite platinums. Like mud-and-guts the job wasn't as bad as I'd heard and I only had trouble with the last two on the passenger side. Tricky getting a torque wrench in there!
The old plugs were all uniformly fouled around the electrodes but not rusty at all.
The coils and boots were in good shape, I wiped them with a damp rag while I had them out and blew the holes out with an air compressor before I loosened the old plugs.
So far the only thing I definitely noticed is that the engine fires up quicker. I noticed tha right off the bat. Don't know if it has helped mileage yet.
Aside from those two on the passenger side, it's a 1 hour job! I'm glad noone came down my driveway while I was working on those last two plugs. I was lying face down across the engine compartment uttering profanities. Must've looked kinda weird!
Thread Starter
|
Senior User
Joined: Dec 2009
Posts: 234
Likes: 0
Its looking like I gained 1-2mpg with the plug change(up from under 12mpg to over 13mpg)... This is going off one fill up so time will tell.
Here is a picture of my truck with the currant setup.
Here is a picture of my truck with the currant setup.
Postmaster
Joined: Oct 2008
Posts: 3,924
Likes: 6
From: Richmond BC
thanks for the update..
i'm considering wether or not to do mine..
truck seems to be dropping mileage lately and power seems slightly off. but the truck runs great/smooth..
thinking about doing the plugs for peace of mind.. done everything else i can do for drivability except them up till now.
i'm considering wether or not to do mine..
truck seems to be dropping mileage lately and power seems slightly off. but the truck runs great/smooth..
thinking about doing the plugs for peace of mind.. done everything else i can do for drivability except them up till now.