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Old 02-07-2008, 05:05 AM   #1
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What Spark Plugs to use

Im going to change my spark plugs soon and i was wondering which ones to buy for the best fuel economy
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Old 02-07-2008, 05:52 AM   #2
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What vehicle are you running?

I have had good luck with Bosch +4 platinum plugs in all vehicles I've used, but they do better in certain vehicles than others. In some vehicles you'll want iridium plugs, not in others. Tell us what you've got - it will help feedback.
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Old 02-07-2008, 06:47 AM   #3
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If you indeed are running a Civic VX as shown in your vehicle log, then you want to run NGK V-Power ZFR4F-11 plugs.
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Old 02-07-2008, 07:25 PM   #4
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Lot of controversy about this topic. Usually people who use specialty plugs either are getting something they don't need or are having problems and using the plugs for a crutch.

Toyota recommends Iridium plugs in the Yaris. The Honda CRX requires conventional NGXs but I've done better with Bosch platinums, which I installed before I learned about the Honda Main Relay issue..

The Chevy uses NGKs and runs as well as can be expected for an old beat up car.

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Old 02-08-2008, 02:36 AM   #5
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sorry I have a 1994 honda civic vx
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Old 02-08-2008, 02:52 AM   #6
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Go with the stock NGK V-power plugs, I've tried number of differnt plugs including the Bosch +4 platinum, and my engine ran smoothest with the NGK, the only improvment that I could see is if you indexed your spark plug, pull a spark plug out and you will notice that it has almost a shadowing, put the open side of the spark plug twards the center of the flame with the arm of the spark plug in the shadow.
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Old 02-08-2008, 03:39 AM   #7
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I've run many different vehicles on both platinum and copper plugs and never noticed a difference in power or FE. For FE inprovement, you might just try messing with the gap of standard copper plugs in you engine. I went from a .44 gap to .52 (~20% increase) and my cold starting improved, cold idle is smoother, and I can shift at a lower rpm without the engine feeling over-stressed...i.e., more low end torque. I've only run a tank like this, but so far it seems to have improved the FE a bit...gonna fill up today and see what it comes to. The only catch is that if you're coil is weak or on the brink, it might have trouble firing across the larger gap...my coil is 14 years old, has ~200k miles on it and it works great.
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Old 02-10-2008, 11:39 AM   #8
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any of you guys see the PULSTAR plugs ???http://www.pulstarplug.com/
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Old 02-10-2008, 02:37 PM   #9
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Intriguing, and they might work...but they're damn expensive!
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Old 02-10-2008, 04:49 PM   #10
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Originally Posted by Rower4VT View Post
I've run many different vehicles on both platinum and copper plugs and never noticed a difference in power or FE. For FE inprovement, you might just try messing with the gap of standard copper plugs in you engine. I went from a .44 gap to .52 (~20% increase) and my cold starting improved, cold idle is smoother, and I can shift at a lower rpm without the engine feeling over-stressed...i.e., more low end torque. I've only run a tank like this, but so far it seems to have improved the FE a bit...gonna fill up today and see what it comes to. The only catch is that if you're coil is weak or on the brink, it might have trouble firing across the larger gap...my coil is 14 years old, has ~200k miles on it and it works great.
yeah, that's what I was going to ask about, the plug gap. that seems like it would have an effect on something. I could have swore I read that the expensive one last longer or are more prone to corrosion or something.
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