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Reading my spark plug

Old Feb 22, 2010 | 12:30 PM
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From: Antigo, WI
Reading my spark plug

what do you guys think? running bad? plugs bad? just pulled them out this morning....

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Old Feb 22, 2010 | 12:42 PM
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From: Orange/Rockland, NY
http://www.ngksparkplugs.com/tech_su...qs/faqread.asp
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Old Feb 22, 2010 | 01:23 PM
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the picture suggests some problems. a list of your mods would help, such as injector, type of tune, ecu ...?

despite the fact the picture is near worthless, your car may be running rich and who knows what else. An in focus and brightly lit photo would help.

However in this day and age a log of your motor from evoscan with wideband reading would be the most help.
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Old Feb 22, 2010 | 03:01 PM
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all i have is an intake, other than that the motor and everything is stock, and im sorry i did this at my grandpas so all i had was my iphone
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Old Feb 22, 2010 | 03:05 PM
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Looks rich, how many miles on the plugs?
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Old Feb 22, 2010 | 03:59 PM
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Detailed notes on the last 60 minutes of engine operation are needed to diagnose a spark plug, unless it's completely oil fouled. Like was it all idling, lots of cold operation, 60% full throttle, what kind of fuel and additives, etc.

If you want to try to read engine condition and tune via spark plug color and condition, you must start with new plugs and inspect them in less than 30 minutes of operation after running them only in the conditions you are curious about. Very much artwork. That's why wide-band sensor kits are so popular - real instrumentation.

And as noted above having clear, light-up pics is much more useful.
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Old Feb 22, 2010 | 04:34 PM
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I suppose a plug could look that rich from a start up in very cold weather (?)... over the course of a week or so, more likely if you never drove it off.

but... with closed loop afr on a warm engine, idle will clean the plugs... if the car is running right.
Do you have a check engine light on your dash?

there is a lot to reading plugs, as Q15H implies. Its truly amazing what a knowledgeable guy can see on a plug. The standard plug chart you see at the auto store is a joke.
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Old Feb 23, 2010 | 05:33 AM
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I only ran it a week in some colder weather then I put it in storage, running 91 octane, but the last 3-4 tanks were 93 now, for now it is parked, it ran pretty good, no service engine light for now but once in a while I get a code that says, evaporative emmisions control leak, but I think that might be me not fully tightening my gas cap sometimes
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Old Feb 23, 2010 | 08:11 AM
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Damn that's one fouled plug. You are running too rich;
http://www.machv.com/foulsparplug.html
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Old Feb 24, 2010 | 05:31 AM
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U think that is fouled for sure?
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Old Feb 24, 2010 | 08:01 AM
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That's why I posted the link.
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Old Feb 25, 2010 | 01:01 PM
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take a look at this, I copy and paste without embarrassment, forgive me.
from a thread over on the Innovate forum, in regards to a question, and a pic, of reading plugs

"The red orange color usually means there is manganese in the fuel, octane boosters stuff like that. It would be very unusual to get a red color with out additives. I dont know anything about the engine but the photos appear to show a slight rounding of the corners of the center electrode. At the very least there appears to be a clean zone on the corners. If this is the case then its likely that the mixture is insufficiently vaporized at ignition time. When the atmosphere is low in gas content around the arc location the oxygen burns the metal of the centre electrode. And it usually does this on the edges because thats where the electricity runs. Sometimes this deterioration is reduced by using a more powerful ignition. If the arc concentrates on the corners it generally means the ignition is weak. More amp flow will cause the arc to jump in the area of the entire flat section of the center electrode. This is better because the arc can then leave from different locations across the surface and that reduces heat buildup and decreases resistance. So the clean zone could be from the style of ignition used, and the erosion could be from the oxygen concentration at the arcing time. But there needs to be better photographs to be certain of that.

The red coloring is evenly dispersed which is what i see with octane additives here in Australia. We don't have reformulated gasoline here so I don't know what that looks like. But the deposits are smooth and that's a good thing, Its probably a good engine well tuned. It hasn't been working hard."
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