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Old 08-22-2010, 06:42 PM   #1
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E3 spark plugs, few months, burnt out.....

so, a few months back i bought a set of 4 E3 spark plugs, they worked great, i went easy on them, there was a few occasions when i did get on it(everyone does lol) then about a week ago i noticed the car would choke down and then throttle up on hard acceleration. from a dead stop in a straight line, so i thought maybe a vacuum hose was loose but they all seem fine, so i moved to the intake, put it back to stock and still same problem, so i decided to look at the spark plugs they were kinda orange and burnt, so i went to walmart and bought cheap $10 spark plugs and gained back almost all the throttle response, so i went to kragen to show them the plugs and all the people were stumped and let me go with "they burn to hot for my car", so in my opinion they work great, they made a tank of gas last a little longer, but the plugs don't last a long time and i think they aren't worth the cost of replacing every few months, i had better luck with platinum +2's they lasted almost two years before i replaced them and they still had a little time left on them....my conclusion, some times a little cheaper is longer lasting......


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Old 08-22-2010, 07:02 PM   #2
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were they the proper heat range for your car? (the right length, etc)
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Old 08-22-2010, 07:11 PM   #3
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yeah, they were the right ones, E3.66, here is the catalog look up 03 ford focus 2.0L
http://www.showmetheparts.com/e3sparkplug/
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Old 08-22-2010, 10:21 PM   #4
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My best advise with spark plugs on a N/A car is go with motorcraft/autolite plugs. I've been through the same discussion on just about any stock ford model and have never seen any power or mileage increase using aftermarket plugs.

Get stock plugs, gap correctly, and enjoy.

For a boosted or nitrous application my recommendation changes. I do love my NGK's though.
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Old 08-24-2010, 11:45 PM   #5
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Autolite copper core is the best bet for a N/A engine. Well be sides a Taylor silver plug is it is the best.

Platinum and Iridium are some of the worst conductors of electricity. Gold is the best conductor of electricity but it is much to soft to last. Copper is a cheap alternative and is an excellent conductor of electricity.

Silver is the best trade off for longevity and conductivity.

Also while we are on the topic of spark plugs are the multi-electrode plugs better than single. In most cases, no. Additional electrodes disturb the flow of the gases around the spark plug tip and if anything performance is reduced. In addition, for high performance applications the additional metal within the combustion chamber will retain more heat and may be more prone to detonation/pre ignition.

Also if the gaps are not completely uniform then the 3 frame fronts or sparks generated will be unequal and as electricity is lazy and will follow the path of least resistance the majority of the current will jump the electrode with the least gap.
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Old 08-25-2010, 04:13 PM   #6
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motorcraft coppers are very good as well. you cant get them in any autopart stores anymore but you can still buy them from vendors like massive and CFM. and i think top speed has them as well
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Old 08-25-2010, 10:18 PM   #7
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motorcraft coppers are very good as well. you cant get them in any autopart stores anymore but you can still buy them from vendors like massive and CFM. and i think top speed has them as well
Autolite makes Motorcraft so i generally just stick with them, also they have a true solid copper core at 1.99 each.
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Old 08-28-2010, 04:48 PM   #8
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I've never had a problem with the E3's. I"m running them now.
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