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What spark plugs to use

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Old 07-13-2011, 10:56 AM
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The SP-509s won't work in 2004-2007 built engines.

SP-509s if your spark plug boots are brown in color....SP-515 if they are black.
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Old 07-13-2011, 01:48 PM
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I put those e3s in my truck 3 weeks ago and ive had a progressively worsening misfire condition. The motor barely runs on a cold start. MIL came on 2 days ago.... Misses randomly at cruise and light acceleration. Oddly enough at WOT it runs like a champ.
Turns out the e3s use a nickel plated copper electrode. Could this be the issue since ford wants platinum plugs?
I emailed e3 and they say they've not had any problems from 5.4l owners, but want my plugs back for testing...
Any thoughts?
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Old 07-13-2011, 02:24 PM
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Originally Posted by countryboy32
I'm must be missing it because I didn't see the sticky.
Are you serious?

https://www.f150forum.com/f4/5-4l-3v...09-07-a-56871/
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Old 07-13-2011, 02:27 PM
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Originally Posted by Bennyv83
I put those e3s in my truck 3 weeks ago and ive had a progressively worsening misfire condition. The motor barely runs on a cold start. MIL came on 2 days ago.... Misses randomly at cruise and light acceleration. Oddly enough at WOT it runs like a champ.
Turns out the e3s use a nickel plated copper electrode. Could this be the issue since ford wants platinum plugs?
I emailed e3 and they say they've not had any problems from 5.4l owners, but want my plugs back for testing...
Any thoughts?
Did u set your gap correctly? Sounds like u have to much.
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Old 07-13-2011, 02:29 PM
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Originally Posted by BassAckwards
Did u set your gap correctly? Sounds like u have to much.
There's no gapping of E3's.
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Old 07-13-2011, 03:12 PM
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Originally Posted by Bucko
There's no gapping of E3's.
So they are really just that crappy of a spark plug? Good to know!
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Old 07-13-2011, 03:54 PM
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Motorcraft SP515
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Old 07-13-2011, 04:57 PM
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The gap on the e3s looked to be about half of that of the VERY worn out MC plugs which had about 110000m on them.
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Old 07-13-2011, 06:44 PM
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Originally Posted by Bucko
My bad. I saw that thread already. I guess I thought he was talking about another one.
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