What do these sparks plugs say?

Joined
Mar 3, 2010
Messages
769
Location
Prosper, TX
These are out of my kids 2018 Kia Sportage with 88,000 miles on it. It has been burning about a quart of oil every 1,500 miles or so. That has slowed way down with the HPL EC cleaning to about 1/2 quart every 2,000 miles. It’s been running rough so I did a CRC DI spray cleaning and changed the plugs. It’s running much smoother now. I replaced these stock plugs with the NGK Iridium IX plugs.

The burning on the ceramic is what makes me question them?

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Joined
Jan 1, 2003
Messages
2,461
Location
Daytona Beach
WAY too rich.
Bad injectors would be my first guess. If it doesn't have injectors then fix the mass air sensor or whatever is controlling the mixture. Including your kids foot.
Since they are all equally fouled with soot, I'd lean toward the MAF sensor or air filter/intake.
 
Joined
Jul 13, 2003
Messages
2,586
Location
Tracy, CA
All my automotive applications and the Yamaha run NGK spark plugs; they all get that "burnt" look. Consider it normal.

Re: the firing end; I don't think you can read plugs that have had spray cleaning solvents run through the intake. 🤷‍♂️
 

FZ1

Joined
Feb 7, 2008
Messages
5,915
Location
Texas
These are out of my kids 2018 Kia Sportage with 88,000 miles on it. It has been burning about a quart of oil every 1,500 miles or so. That has slowed way down with the HPL EC cleaning to about 1/2 quart every 2,000 miles. It’s been running rough so I did a CRC DI spray cleaning and changed the plugs. It’s running much smoother now. I replaced these stock plugs with the NGK Iridium IX plugs.

The burning on the ceramic is what makes me question them?

View attachment 114021 View attachment 114022 View attachment 114023
Burning oil on plugs. Ceramic running too hot?
 
Joined
Jan 2, 2004
Messages
10,013
Location
California
The brown rings on the upper half is residue from corona discharge - while the ceramic is “sealed” to the plug shell, ceramic is porous. When an high-voltage spark is discharged, the air surrounding us is ionized and ozone rich.

Now, the tips, you have an oil burner. Time for a piston soak.
 
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