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Old 05-10-2008, 08:47 PM
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Best spark plugs for MPG

I just rebuit my Chevy 4.3 , 93 C1500 Truck so it all new now. What would be the best spark plugs to get for best gas mileage also what about the wires.
I have 8mm on there now are they good ? and should I keep the timing at spec ? Gas price are high I need to save all I can. Thanks

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Last edited by gatliff; 05-10-2008 at 08:58 PM.
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Old 05-10-2008, 09:07 PM
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Stick with the factory recommendations and specs and keep your foot out of it! LOL


Mark
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Old 05-10-2008, 09:16 PM
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Also replace your fuel filter and air filter frequently, and check your tire pressures weekly.
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Old 05-10-2008, 09:51 PM
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Has anyone had better MPG results with Splitfire or E3 plugs? I've heard splitfire are good for HP but definetly not with Nitrous Ox though. Instant Glowplug.
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Old 05-10-2008, 10:31 PM
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A L O N G time ago I tried some Splitfires.......nothing different at all. Then I read some magazine tests on plugs and they found no real improvement. I think its all a bunch of snake oil and marketing hype anyway.
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Old 05-10-2008, 10:45 PM
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Quote:
Originally Posted by SSedan64
Has anyone had better MPG results with Splitfire or E3 plugs? I've heard splitfire are good for HP but definetly not with Nitrous Ox though. Instant Glowplug.
Don't you think that, if they worked as marketed, the vehicle manufacturers(who are being pressured by the EPA for mileage and economy) would install them and recommend them?

Just my 2 cents worth.
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Old 05-11-2008, 12:06 AM
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Posted by carsavvycook:
"Don't you think that, if they worked as marketed, the vehicle manufacturers(who are being pressured by the EPA for mileage and economy) would install them and recommend them?"

BINGO
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Old 05-11-2008, 01:21 AM
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Spark plugs

Since you are running a GM try the AC Rapidfires,I used them in several cars and picked up a mileage gain and smoother running too,but plugs are like women, we all like something different
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Old 05-11-2008, 08:05 AM
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Quote:
Originally Posted by JeffB
Since you are running a GM try the AC Rapidfires,I used them in several cars and picked up a mileage gain and smoother running too,but plugs are like women, we all like something different
Yep, and have you noticed how much their heat ranges vary? Both too cold and too hot will give you problems at sometime n your life
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Old 05-11-2008, 09:02 AM
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I know they're more costly and you will most likely never recoup your costs through savings at the pump, but Iridium plugs are really amazing. They're not really snake oil either but they do cost $15-$25 a piece which is expensive for a V8 plug change- even if its a 4.3L six its still not cheap. Probably the best hting for milage is limiting parasitic loss and going easy on the pedal.
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Old 05-11-2008, 10:38 AM
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NO spark plug is going to improve our gas millage unless something is wrong with the ones your pulling. Unburnt fuel only accounts for 1-2% so even if you did improve combustion 1% you would be talking about .1 - .2 mpg

Jordon
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Old 05-11-2008, 12:35 PM
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Quote:
Originally Posted by gatliff
I just rebuit my Chevy 4.3 , 93 C1500 Truck so it all new now. What would be the best spark plugs to get for best gas mileage also what about the wires.
I have 8mm on there now are they good ? and should I keep the timing at spec ? Gas price are high I need to save all I can. Thanks
i HAPPEN TO LIKE NGK SINGLE PLAT-
They have extended nose and small electrode,a very nicley designed plug,like a iridium but cheaper at about $2.25 or so...
I say NGK or Denso
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Old 05-11-2008, 08:14 PM
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Thanks guy alot of good info
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Old 05-11-2008, 08:22 PM
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I know most of you won't care for this mpg improver, but I pulled my 3.50 gears out of the rearend and replaced them with 2.75's. I gained about 4 miles per gallon changing them out. It also keeps me from putting my foot into it around town. Just a suggestion.
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Old 05-11-2008, 11:48 PM
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anything but Bosch--i like their tools, but the spark plugs are junk
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