wrd1972

iTrader: (12)

I have now 400 miles on the new motor as well as these new AC Delco plugs. The color of them is a rust brown or light brown.



Does this look normal, I am thinking the A/F ratio is a tad on the lean side from watching the beahvior of the O2 sensor voltage readings compared to my previous motor.

Thoughts?

speed_demon24

iTrader: (6)

There's something seriously wrong with your motor if your plugs are looking like that.

wrd1972

iTrader: (12)

The motor is running strong, although I still want a good dynotune, that should happen soon. I am getting some false KR, but other than that it runs smooth and hard.

The plugs just started turning brown, at 300 miles the insulators were still very white. From what I have google searched this appears to be perfectly normal. maybe I am wrong here.

Formula413

iTrader: (1)

Isn't a light brown color normal? And wouldn't a lean condition turn them white?

siniSSter

iTrader: (2)

No, that cylinder is running lean

wrd1972

iTrader: (12)

Here is why I Think I am running lean.

The O2 MV readings when bouncing do not get into the 800's or higher on my Scanmaster, the old motor reached 900 MV routinely.

WOT O2 MV is low to mid 800's or so.

I think I am getting some very slight knock at high RPM's. Still might be false.

Oh my god love the avatar, it looks like Mario is trying to knock the bottom of that thang.

Formula350

iTrader: (3)

heh I've never seen one rust brown before, that's kinda effed up!

wrd1972

iTrader: (12)

Turns out the rusty color is a normal result of running Torko in my last tank of gas. I was checking for detination.

At three hundred miles the insulators were still very white, does this indicate a very lean condition?

Captainofiron

iTrader: (1)

doesnt look bad, as long as its not black and shiny, but maybe a little lean and I thought you had problems my initial thought about the brown color is dexcool


Anyways, check out this link hope it helps
http://www.dansmc.com/Spark_Plugs/Sp...s_catalog.html

speed_demon24

iTrader: (6)

Get that thing on a dyno ASAP. My 02's read about 920-930 at WOT.

FAD2BLK93

My first thought was water or antifreeze in the chamber.

1997bird

iTrader: (2)

The plug color is showing an additive fouling problem. Check for speckeling on the insulator of the plug for detination from running too lean. From the pick shown you don't appear to running lean, you can still see light carbon on the inside wall of the plug body.

Formula350

iTrader: (3)

From my readings here recently I've found @ WOT the O2 isn't used.

speed_demon24

iTrader: (6)

They aren't but you can still get a general idea of what the a/f is by what they display at WOT.

wrd1972

iTrader: (12)

Dont see any specs on the insulator, maybe there is no detination after all. The KR I am getting is probobly all false.

TravisTA

My plugs look like that, but it is because I run torco in my car. If I run premium or race gas they dont turn that color.

AINT SKEERED

iTrader: (2)

WHAT about plugs that stay white every where. Even the electrode?

LMz28

iTrader: (2)

http://opc.mr2oc.com/online_parts_ca...park_plugs.jpg
does this help?

1997bird

iTrader: (2)

Can you see any speckeling on the insulator (little shinny specs)? Can you see any carbon on the inside wall of the spark plug body (the opposite side of the threads)?