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Old 01-14-2012, 07:01 PM   #11 (permalink)
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dunno, i put those plugs in before i really payed attention i'm going to go with probably not though.

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Old 02-17-2012, 02:54 PM   #12 (permalink)
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I have had a set in my 98 Civic EX for a long time and they didn't make a lick of difference. I looked at them the other day when replacing plug wires and i should have picked a new set of plugs as well. Someone talked about indexing plugs in an earlier post that i think i would go that route instead of E3's again for my car.
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Old 02-17-2012, 02:59 PM   #13 (permalink)
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More ground electrode might prevent plug fouling, that's why they may improve small engine performance. A good engine doesn't burn very much oil, and plug fouling is not an issue. I run a regular NGK copper plug (indexed) in my 15 psi 300 whp Nissan turbo L28, and have not seen any misfiring up past 6000 rpm. And that same setup gets 29mpg cruising 70mph.
I'm not coasting, I'm shifting slowly.
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Old 03-10-2012, 07:26 PM   #14 (permalink)
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Have tried them did not make any noticeable difference

"The only real mistake is the one from which we learn nothing."
- Henry Ford
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Old 03-10-2012, 08:05 PM   #15 (permalink)
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a question for anyone running a scanguage ! is it able to tell any difference in the mpgs when you change plugs. I changed my plugs from the oem double platinum to a copper core and I felt a difference in the way the car ran and I saw a jump in tank to tank mileage . what difference would you see in the scangauge? does it automatically read these changes?
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Old 03-12-2012, 12:47 AM   #16 (permalink)
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The SG will read the pulse width sent to the fuel injectors, and the vehicle speed sensor reading. It won't detect changes in the spark, but if your engine truly does use less fuel to travel the same route, it should see that.

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Old 03-12-2012, 08:42 PM   #17 (permalink)
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All those early hondas I worked on really used up plugs, at around 25 k miles they lose about 2 + MPG in my experience, I'm talking the 90's Honda Civics and Accord, I asked the dealer at the time 1991 and he said every 15 K was recommended, he was right milage on the Accord went up over 3 , on another note unrelated has anyone here looked up the old Mobil fuel economy Run results from the 50's and 60's could be interesting.

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