Does this spark plug look normal?
Thread Starter
Joined: Mar 2006
Posts: 4,668
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From: Central Kentucky
Does this spark plug look normal? 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?
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?
Thread Starter
Joined: Mar 2006
Posts: 4,668
Likes: 5
From: Central Kentucky
Originally Posted by speed_demon24
There's something seriously wrong with your motor if your plugs are looking like that.
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.
Last edited by wrd1972; Jun 15, 2007 at 11:10 AM.
Thread Starter
Joined: Mar 2006
Posts: 4,668
Likes: 5
From: Central Kentucky
Originally Posted by siniSSter
No, that cylinder is 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.
Last edited by wrd1972; Jun 14, 2007 at 08:58 PM.
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Thread Starter
Joined: Mar 2006
Posts: 4,668
Likes: 5
From: Central Kentucky
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?
At three hundred miles the insulators were still very white, does this indicate a very lean condition?
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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
Anyways, check out this link hope it helps
http://www.dansmc.com/Spark_Plugs/Sp...s_catalog.html
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.
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From: Decatur, TN (N-W of Athens)
Originally Posted by speed_demon24
Get that thing on a dyno ASAP. My 02's read about 920-930 at WOT.
Originally Posted by Formula350
From my readings here recently I've found @ WOT the O2 isn't used.
Originally Posted by AINT SKEERED
WHAT about plugs that stay white every where. Even the electrode?
