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spark plug question

9K views 19 replies 9 participants last post by  hyunelan2 
#1 ·
My girlfriend has an 04 elantra GLS and i recently put bosch +2 plugs in it replaced those crappy champion plugs and they looked crappy when i pulled them out. The guy at autozone told me that the bosch +2 were good for her car well the gas mileage went down bad on her car I also replaced the wires with the duralast brand like i did in my jeep wrangler.

everyone says that NGK are the ones to use but i am not sure which ones to use. does anyone know i have read all that i can find in the search but no one ever mentions the 04 elantra only the 02 and 03 So does anyone know which ones to use

thanks
 
#2 ·
NGK V-Power BKR5E-11 Stock # 6953, Gap .039-.044, about $8. These do not last as long, but the price is right. The OEM Champions are platinum and NGK also has them.

Keep an eye on the Duralast wires, because auto-store brands do not always fair well.

I've used Bosch +2 for 40 K miles on my 03 with no problems.
 
#3 ·
i just got 29mpg out of my last tank, 103k on an 02 GLS, and I'm running the Bosch +2's. they work fine for me. maybe the wires are cheap. the plug is already higher resistance, if the wires are higher resistance too, could be a bad combo. Did you reset the ECU after the plug/wire change?
 
#4 ·
The wires are your problem. Double check them, I bet you'll find that they aren't connected to the plug that well. That happens after driving awhile.

I personally don't like the Bosch spark plugs, as I've had problems on the performance side of things. Though a little bit more expensive, but worth every penny, I would go with the NGK Iridium IX's. Gas mileage can improve and performance is definitely there. If you need a new set of wires, I would buy a new set from the dealership, or search for Magnecor wires. They are expensive, but you won't lose MPG or performance.
 
#12 ·
rockauto.com is where i got mine. I still say you should wait until at least 100,000 miles before changing the wires.

I am starting to think that plugs aren't going to make much of a difference. I ran v-powers for 20,000 miles with no problem. Now I'm running cheapo Autolite double platinums with no problems. I like double platinums because there's no gap erosion.

NGK Power Iridiums are better than the IX's because of the platinum tipped ground electrode. These are stock on lots of cars now and they are not to be replaced until 100,000 miles and there's still no gap erosion.
 
#13 ·
I replaced my old champion plugs that were eroded and black and had what looked like rust on the plug end of it with the NGK iridiums. I want to replace the wires because mine are physically worn, plus the NGK ones are blue :]

I ended up ordered them from sparkplugs.com. they're due to show up today or tomorrow.
 
#14 ·
I ordered my NGK coppers and NGK wires from sparkplug.com, no problems. As everyone said, the NGK wires are blue, but if you put the protective cover over the plugs/wires you don't see them anyway. The NGK wires are a little harder to route than the OEM, as they are bigger and stuffing them into place takes a very small amount of effort. They work well though.
 
#20 ·
Yeah, that's why I bought from them too. Just something to keep in mind for those who are on a shoe-string budget.
 
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