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Old 09-19-2014, 12:55 AM   #1
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New plugs

I put in the E3 plugs on my 2002 gt about 500 miles ago. The motor don't like them needless to say. What plug and how hot of a spark should I go? Nothing is done internally. But just about every bolt on with aftermarket injectors. (Not sure of size cause they were on the car when I bought it. But they are red).

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Old 09-19-2014, 10:47 PM   #2
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You don't need anything special... The factory Motorcraft plugs are all that is necessary.

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Old 09-20-2014, 08:20 AM   #3
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The E3 plugs are a junk, snake oil product. Just like splitfires were. Are they even still around? Autolite 104s are $2 each and the stock equivalent plug. I run 103s as the modulars like running a little cooler.

If your COPs are in good shape but have not been done yet you can rebuild them. If they have cracked housings or are not OEM, best to replace them with new OEM.
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Old 09-20-2014, 11:33 AM   #4
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I totally agree that the E3 plugs are junk for our applications. Go with OEM Motorcraft plugs, I just did mine with OEM and the car runs great. I always even this last time went to Ford parts department and picked them up. No hassle, 1000 options to choose from, just tell the clerk your year and model and they come out with the right ones everytime. And they are priced to any parts store comparibly. And I replaced all the COP boots at the same time and had them on hand as I have been down that road when changing theplugs and the boot rips or breaks off pulling them out. Then you have to have a second car to take you to the parts store to get a set of boots. Best to have them with you when you change them out.

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Old 09-20-2014, 02:05 PM   #5
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103 auto lites here. Car been running great since.

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Old 09-21-2014, 12:02 AM   #6
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My Bosch plugs have worked out great for me. Not anything like the "plus 4s" in the Bosch just the standard platinum Bosch plugs, I believe I paid about 5 bucks a plug IIRC.

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Old 09-21-2014, 07:39 AM   #7
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I'm old school so for years I have run the copper version of the factory plugs and was fine for them except for having to change them too often compared to the platinum version.

Last change I switched to NGK Iridium TR55 I think is the model.
Car idles better and seems to have more power.
They are expensive but they last a long time and I hate changing plugs.

The E3 and the other "super plugs" with new design features are junk.
At best they do nothing.
At worst they decrease your performance.

Bosch is another brand I steer clear of, in general for Mustangs.
That companies parts may work great in German cars, but they seem to cause odd problems in Fords for some reason.
There are exceptions of course and some people have no troubles, but in general I steer clear.
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Old 09-21-2014, 09:57 AM   #8
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Get the ngk iridium plugs. I got a set cheaper at autozone instead of american muscle. I used to have a set until i went with ngk tr6 when i went supercharged.

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