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Discussion Starter · #1 ·
2004 mustang gt with 73000 miles a bama tuner SR performance CAI and glass packs... It's a dd what's the best brand of plug to get for mpg and performance and also what cops should I get its time to replace them
 

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Cops you need to stay with OEM there is not another brand out there that compares to the consistent quallity of OEM COPS. as far as Plugs NGKBR7EF.
 

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+1 They are a perfect match. Huh.... why are you replacing the COPs?
 

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Discussion Starter · #4 ·
They have not been replaced yet and the car has a hard time starting when it's warmed up
 

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Discussion Starter · #6 ·
Can it hurt to change the cops with 70000 miles
 

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what happens when the COPs go bad?
 

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Misfiring, loss of power, poor gas mileage ETC.
 

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2004 mustang gt with 73000 miles a bama tuner SR performance CAI and glass packs... It's a dd what's the best brand of plug to get for mpg and performance and also what cops should I get its time to replace them
It cant hurt. But if they aint broke, dont fix them. oem cops will outlast any other cop that i know of. As for sparkplugs, get either ngk tr6s or autolite 103s.
04GT,

73k is definitely a good time to replace your Spark plugs. I would go with either OEM, NGK or Autolite like Froush said! I went with the TR6's when I Replaced the plugs on my Mach1.

If the Cops aren't bad, I agree there's no need to fix them. The OEM Cops will last a very long time, however it cant hurt to replace them and if you have some extra cash lying around, then go for it!. I would recommend grabbing a set of factory Cop's if you do choose to replace them.

I hope this helps! Let me know if you have any questions. Our Mustang Experts are here Monday-Friday from 9AM-9PM EST and Saturdays from 9AM-5:30PM EST. If you want to hit them up, their number is 866.727.1266.

-Dan
 

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I just run the plain Autolite copper core plugs. Mines a 2004, and IIRC the 2004 uses the 104's with the full threads. Not only are they cheap, but I can buy them at WalMart when I'm grocery shopping. I change them out every 3rd or 4th oil change. That way I can inspect them for any motor issues and make sure they're tight.
 

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NGK TR6s and Autolight 103s are for boosted applications. They are a one step colder plug than normal. I wouldn't recommend them for a non-boosted application. Also, I once found Ford COPs for about $53 on-line. My mechanic has replaced two over the years. He charged me $80 each.

Fordy9er, didn't you have an intake manifold break about the same time as I did. My break drenched the entire motor in antifreeze. I had a bad miss and I had one COP replaced but I swear I still feel a slight miss sometimes. Other times not.

I have read that we need to take the boots off the COP and clean everything. I just haven't done it yet. But I think it would be wise to do that before buying all new COPs.
 

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Discussion Starter · #18 ·
i started getting a ticking noise after i put on my bama tuner so i called bama and they said i need a copper core spark plug to make the ticking noise go away
 

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You should run autolite 764's, they are cheap, copper core, and identicle to the oem motorcraft plugs. I just had a thread about this not long ago and after doing much research I went with the autolite 764's and I love them. Car picked up throttle response and I picked up 2 mpg from what I can tell already. Best bang for the buck and they run great on a bolt on gt.
 

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NGK's are also good plugs but I don't see it being worth spending the extra money. If you were boosted I'd say NGK TR-6's but for a basic bolt on car the cheapest best plug is the autolite 764, or atleast so I find.
 
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