Dirty Spark Plugs
#2
He's as bad as Can
How many miles were on them?
https://www.rx8club.com/attachment.p...chmentid=62520 is a photo of my last set with 32,000 miles on them. The car was running ok so I guess "dirty plugs" is normal? I just changed them because I hit 50,000 miles. I plan to change them again at 100,000.
https://www.rx8club.com/attachment.p...chmentid=62520 is a photo of my last set with 32,000 miles on them. The car was running ok so I guess "dirty plugs" is normal? I just changed them because I hit 50,000 miles. I plan to change them again at 100,000.
#3
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Originally Posted by expo1
How many miles were on them?
https://www.rx8club.com/attachment.p...chmentid=62520 is a photo of my last set with 32,000 miles on them. The car was running ok so I guess "dirty plugs" is normal? I just changed them because I hit 50,000 miles. I plan to change them again at 100,000.
https://www.rx8club.com/attachment.p...chmentid=62520 is a photo of my last set with 32,000 miles on them. The car was running ok so I guess "dirty plugs" is normal? I just changed them because I hit 50,000 miles. I plan to change them again at 100,000.
At best that is 20K per year at worst over 25K per year. Even in the commuting crazy NE, that is crazy...
Lucky you
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#4
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Originally Posted by bong
will cleaning these spark plugs do any good? or should I just get a replacement? thanx
#7
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Nubo, I used Castrol 5W20 non-syn before. For the last 2 oil changes, I used pennzoil.
Around after 22000 miles, my car is getting more backfire/popping, worsen gas mileage (about 2mpg less) and seems to have loss some power (butt dyno).
I just cleaned the plugs and put them back in. I havent really tried it out yet, but it seems throttle response is better and high end power is back (still need to find a safe place to test that out again). Will check the MPG when I finish this tank of gas.
Thanks for the responses, more feedback welcomed.
Around after 22000 miles, my car is getting more backfire/popping, worsen gas mileage (about 2mpg less) and seems to have loss some power (butt dyno).
I just cleaned the plugs and put them back in. I havent really tried it out yet, but it seems throttle response is better and high end power is back (still need to find a safe place to test that out again). Will check the MPG when I finish this tank of gas.
Thanks for the responses, more feedback welcomed.
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i thought the car's manuel says to replace the plugs at 35k miles (fo rheavy driving)...that's when i replaced mine. but my plugs didn't look tha tbad when i changed them out. i woudl replace them...but tha tis just me.
#11
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Originally Posted by bong
According to sparkplugs.com, there are some denso plugs available. would these be any better than stock? thanx
and as for changing the plugs, there's been a bit of variety on that. some people changed theirs around 10-15k miles and found heavy build up. dealer changed mine at 26.8k miles when i went in for a misfire cel.
Last edited by Glyphon; 11-21-2005 at 01:18 PM.
#13
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one of those denso sets is new, but i'm not sure which one. when i ordered plugs from them a month ago, there was only 1 set of denso on the site.
you can try it if you want.
if you do, report back with how they work for you
you can try it if you want.
![Dunno](https://www.rx8club.com/images/smilies/dunno.gif)
if you do, report back with how they work for you
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#14
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haha. Im not sure if I wanna be the first test monkey, but Im still quite far away from mazdas scheduled spark plug replacement.. perhaps I will give it a shot. let you guys know. :]
#16
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Originally Posted by TeamRX8
I only have 3,000 miles and have changed them twice already ![Uhh](https://www.rx8club.com/images/smilies/uhh.gif)
![Uhh](https://www.rx8club.com/images/smilies/uhh.gif)
![Stick Out Tongue](https://www.rx8club.com/images/smilies/tongue.gif)
![Wink](https://www.rx8club.com/images/smilies/wink.gif)
#17
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Originally Posted by Nubo
Anyone know what's that white crusty stuff? I notice it on other sparkplug pics from the 8. Is that ash deposits from burning oil?
BTW, this material on the body of the plug has little effect on the efficiency of the plug since at this state the material is essentially non-conductive. In fact, what you look for in a properly running engine, that is, good air-fuel mix and a strong ignition, is a light tan material on the center ceramic insulator. If the center insulator is black, particularly shiney black, you have a problem one or more of those parameters, or with too much oil in the combustion chamber.
#19
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Originally Posted by bong
Center insulation? that is like the tip in the middle? I will try to get a better pic tonite. I cant tell whether there is black stuff stuck around it.
If the insulator is fouled with carbon material, the electrical energy in the center electrode will have difficulty jumping the gap to the electrode attached to the body of the plug and to produce a strong spark. In fact, it may not spark at all. Essentially, the electrically-conducting carbon material tends to short out the center electrode.
Last edited by Go48; 11-21-2005 at 03:55 PM.
#21
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Originally Posted by bong
Err... ok thanx.. now how do we check if the ceramic insulator is clean?
So, if the insulator is black, you must somehow clean the black material off in order to improve the performance of the plug. That can be very difficult unless you have a spark plug cleaning device that actually sand blasts the material off the insulator. Best to just replace the plugs if there is a lot of black material on there.
#23
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Originally Posted by bong
ic. I guess mine is stuck w/ black stuff down at the electrode.
Thanx Go48 for the info!
Thanx Go48 for the info!
You're welcome.
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Changing sprak plugs
I have 40K miles on my 2004 6 speed. I have yet to change the plugs, but really have no problems. Should I change anyway? Also, would I be right in stating there are 4 plugs, two inlet and two outlet?