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#4488885 - 08/15/17 12:58 AM 04 F250 5.4L 158,000mi on spark plugs.
Kibitoshin Offline


Registered: 04/19/16
Posts: 698
Loc: Kaiōshinkai
Had to take home a company truck 2004 Ford F250 with the 5.4L 2v and 6 speed manual transmission and right off the bat it would shudder so bad and lose power under certain speed and engine load. Poor throttle response when you stab the pedal to the floor, etc. Connected the scanguage to pull codes and one of them was a P0306. Since this is a company truck I am not allowed to perform any of my own maintenance but wanted to see if just changing out that one spark plug solves the power issues. The truck has 158,000mi on it and and I'm assuming this is the original single platinum spark plug from cyl 5 and 6. Company owner says he will bring the truck in for service but who knows when.

Spark plug 5 on the top, 6 on the bottom:




#6 and #5


Hadn't had the chance to drive it around. Throttle response seems to be better when stabbing the throttle to the floor.
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Shin Gekiretsu Shin'ou'hou
01 Toyota Tundra 2WD V8 4.7L - 170k mi
02 Chevy Silverado C1500 V8 5.3L 154k mi

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#4488891 - 08/15/17 01:23 AM Re: 04 F250 5.4L 158,000mi on spark plugs. [Re: Kibitoshin]
oldhp Online   content


Registered: 06/28/12
Posts: 1634
Loc: USA
Stock ignition systems are pretty darn good......ain't they. Looks like all goody has been used up in those plugs.
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#4488921 - 08/15/17 03:47 AM Re: 04 F250 5.4L 158,000mi on spark plugs. [Re: Kibitoshin]
SilverFusion2010 Offline


Registered: 06/29/11
Posts: 1665
Loc: Crawfordville FL
I would change all the plugs and send him the bill. Or refuse to drive a vehicle that is arguably dangerous.
_________________________
2010 Ford Fusion SE 3.0L V6, 178k miles M1 HM 10w-30

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#4489046 - 08/15/17 08:30 AM Re: 04 F250 5.4L 158,000mi on spark plugs. [Re: Kibitoshin]
WobblyElvis Offline


Registered: 09/23/14
Posts: 1355
Loc: Toronto Canada
You are taking a risk working on someone's vehicle without their permission. What if one of the plugs pulled the threads out the head when it was removed?

I understand you have good intentions but others may not see it that way. Be careful.

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#4489047 - 08/15/17 08:34 AM Re: 04 F250 5.4L 158,000mi on spark plugs. [Re: Kibitoshin]
Panzerman Offline


Registered: 12/16/06
Posts: 4203
Loc: Port Orange, Florida
The company truck I am driving right now a 2005 Ford F150 with a 4.6 has 233,678 miles on it and I am pretty sure it's the original spark plugs and ATF. Company trucks at this company usually don't get any other maintenance other than oil changes, tire rotation and air cleaners. The fact that it probably idles 4-5 hours a a day. It runs good yet. Getting a little tired on take off but it's only 4.6.
Uses no oil between oil changes.
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2006 Dodge Ram 2500 Hemi 4x4
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#4489099 - 08/15/17 09:33 AM Re: 04 F250 5.4L 158,000mi on spark plugs. [Re: Kibitoshin]
zzyzzx Offline


Registered: 05/18/12
Posts: 4372
Loc: Baltimore, Maryland, USA
Did you measure the gap on those old plugs?

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#4489149 - 08/15/17 10:46 AM Re: 04 F250 5.4L 158,000mi on spark plugs. [Re: Kibitoshin]
sohccammer427 Offline


Registered: 12/11/06
Posts: 51
Loc: North Carolina, USA
Those may not be what was installed at the factory. I thought the Motorcraft agsf22wm was a replacement for AWSF22E?

More threads on the newer plug. Anyhow I believe plugs from the factory have some blue paint on the terminal indicating such. At least mine did.
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#4489159 - 08/15/17 11:00 AM Re: 04 F250 5.4L 158,000mi on spark plugs. [Re: Kibitoshin]
sw99 Offline


Registered: 03/22/06
Posts: 2120
Loc: Colorado
Keep in mind also that the COP boots can and will deteriorate and cause a misfire. My old 2001 F150 bucked under load when this happened also. My plugs were fine, it was a boot.
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#4489206 - 08/15/17 11:59 AM Re: 04 F250 5.4L 158,000mi on spark plugs. [Re: Kibitoshin]
Nick1994 Offline


Registered: 02/19/13
Posts: 10135
Loc: Phoenix, AZ
What was the gap? Looks huge
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2015 Hyundai Sonata 2.4L 79k PU 5w30 & OEM
2000 Toyota Camry 2.2L 228k M1 AFE 0w30 & Wix
1996 Jeep Cherokee 4.0L 146k M1 HM 10w40 & Fram Ultra

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#4489314 - 08/15/17 01:58 PM Re: 04 F250 5.4L 158,000mi on spark plugs. [Re: Kibitoshin]
SirTanon Offline


Registered: 06/23/14
Posts: 2162
Loc: Phoenix, Arizona - USA
When I changed the plugs on my Fusion @215,000 miles, what I found was the factory plugs.. and they were not Motorcraft. They were 'FoMoCo' plugs.

I verified with the local Ford service manager, too. The dead giveaway was the teal-ish dots of paint on the top of each plug... plus the 'FoMoCo' on the side. What you pulled out look like standard aftermarket Motorcraft plugs.
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2010 Ford Fusion SE - 2.5 liter/6F35 Trans - 257,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 55,000mi

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#4489959 - 08/16/17 08:28 AM Re: 04 F250 5.4L 158,000mi on spark plugs. [Re: Kibitoshin]
The_Eric Offline


Registered: 03/31/10
Posts: 5354
Loc: Iowa
Barring an unseen crack or other deformity in the plug, I'd say either a coil or the coil boot.
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2005 Lincoln Aviator 4.6 DOHC
2000 Honda Accord 2.3
2001 Hyundai Elantra 2.0
1979 Ford F-150 351M

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#4490064 - 08/16/17 10:46 AM Re: 04 F250 5.4L 158,000mi on spark plugs. [Re: SirTanon]
L_Sludger Offline


Registered: 10/04/09
Posts: 3947
Loc: Ohio
Originally Posted By: SirTanon
When I changed the plugs on my Fusion @215,000 miles, what I found was the factory plugs.. and they were not Motorcraft. They were 'FoMoCo' plugs.

I verified with the local Ford service manager, too. The dead giveaway was the teal-ish dots of paint on the top of each plug... plus the 'FoMoCo' on the side. What you pulled out look like standard aftermarket Motorcraft plugs.
So there may be some shady opportunity for business selling these plugs on the black market - complete with labeling AND the QC inspector's dab of paint. The paint is there usually to ensure that someone or something did a final check to verify torque values.
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