Best replacement spark plugs for 4.6 3V? - Mustang Evolution

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Old 12-27-2015, 10:34 AM   #1
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Best replacement spark plugs for 4.6 3V?

I have searched and found very little definitive info on what people are using in place of these god-awful, prone to breaking, 2-piece plugs that came with the thing.

I have an '07 GT/CS 'vert and love it like no other car I have ever owned.

I am starting to get a little sputtering and hesitation and figure I probably ought to go ahead and change the plugs. Bought the car two years ago with about 60K on it, I now have twice that. I have seen a reference to a Champion 9989 and not much else. Would like to go with platinum/iridium or similar high quality product to avoid issues.

Please don't try to convince me to stay with the 2-piece Motorcraft ones. I know they will fit and will be my fallback, but I would prefer to get away from them if I can.

Can some of you guys who have changed yours out let me know what you went with?

Thanks in advance.
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Old 12-27-2015, 12:46 PM   #2
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If Im not mistaken champion and brisk are your only other options.


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Old 12-27-2015, 01:18 PM   #3
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Quote:
Originally Posted by gqsmash View Post
If Im not mistaken champion and brisk are your only other options.
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Thanks for reply. I know about the Champions (#9989?) and I have seen the Brisk ones on AM but they were pretty proud of them.

I just picked up some Sea Foam Deep Creep to soak the old ones in before removal and the guys at O'Reilly found an E3 plug that is supposed to fit too.

Does Motorcraft make a one-piece to replace it?
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Old 12-27-2015, 01:59 PM   #4
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I believe the oem motorcraft are still a two piece but are much better now and should never break... I did research the same as u about a year ago...good luck!


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Old 12-28-2015, 12:11 PM   #5
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I used an Autolite plug. It' a HT1. Just make sure that it says Improved Design with HSS Technology on the box. It's a one piece design.

Use the Sea Foam and just take your time. It took me a day to get my plugs out but none of them broke.
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Old 12-28-2015, 12:24 PM   #6
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ONE piece are the Only way to go. Disastrous if you wait too long. If it breaks Ford will not cover the repair. Do it ASAP. I went with Brisk Silver plugs and they are performing great.
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Old 12-28-2015, 01:34 PM   #7
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spark plugs

before you change the plugs run some lucas gas treatment thru two tank full of gas to release the buildup of corrosion on the plug ends. it helps quit a bit
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Old 12-28-2015, 02:15 PM   #8
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I just installed Champion Double Platinum one piece plugs. 06 GT, 18k miles, NA. Had auto litres prior to, one cold setting lower, bad recommendation from Steeda. Had few issues with them. No issues with the Champions. Good luck.
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Old 01-31-2016, 05:59 PM   #9
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Changed out my factory plugs not too long ago and ended up breaking one off. PB Blasting helped but not enough to get all 8. On to the next task...
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