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Old 12-29-2000, 02:41 PM   #1
Scooby Newbie
Member#: 620
Join Date: Dec 1999
Location: SW-MI
Post Spark plug question

This is non-Sube' but I just need a general idea and figured it would be good general info for anyone else.

I pulled the plugs on my wife's neon yesterday and they were a really deep black and really smelled like unburned fuel (all 4 plugs were this way). I don't remember any other plugs that I've pulled being this way. Could the car be running extra rich, or could the plugs be a stage to cold?

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Old 12-29-2000, 03:16 PM   #2
Scooby Guru
Member#: 2958
Join Date: Nov 2000
Chapter/Region: NWIC
2001 WRX (GC8)


If the plugs smelled like gas, then I would assume the car was running way to rich.

I really dont know about the cold/hot thing. Look at the number on the side of the plug, if you can read it, and compare that to the numbers in your owners manual.
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Old 12-29-2000, 07:47 PM   #3
Eric SS
Sooby Guru
Member#: 1914
Join Date: Jul 2000
Chapter/Region: SWIC
Location: 2013 335i, 2014 Q60S
2000 2.5RS w/ EJ22T
swap and N20. gone. : (


Yeah, that is definetly a definete sign of a car running rich.
Either that or she never gets on the gas at all and they are just loading up.
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Old 12-29-2000, 08:46 PM   #4
Scooby Newbie
Member#: 2712
Join Date: Oct 2000
Location: St. Helens, Oregon SPEC , MAPEC
2000 Impreza 2.5RS
Sedona Red Pearl


If she putters around town all day they could be loading up. If you haven't had the car tuned up in awhile, then do a tune up. This includes distibutor cap & rotor if applicable, spark plug wires if they are old or have bad spots in them or if they have too much resistance.(checked with an ohms meter)Spark plugs(of course), air filter, and fuel filter. It would not hurt to go up one step in the heat range, this would make the plug fire better in a mostly idling around town rich mode.
After you have performed all the neccessary stuff, keep an eye on the plugs.(pull the easiest one, if they are all easy then pull them all) If the over rich conditions continue it would be adviseable to have your car looked at by a professional shop.(there may be a problem!i.e. bad sensor or something)It could be an oxygen sensor, but normally they turn on the check engine light when they are faulty. Hope this helps?
I have Denso Iridium plugs for sale if you would like a set for your wifes car. They are $60 a set(4) shipped to you. I take paypal, credit cards(Visa&M.C.), and checks/money orders. I can be contacted by PM, e-mail, or tel. 503-267-5544 & 503-366-0874.
In case you were wondering I am a mechanic by trade, this is what we recommend to do in cases such as yours. Happy New Year! Cya, Gary
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Old 12-30-2000, 10:08 AM   #5
suby ej25
Scooby Specialist
Member#: 3047
Join Date: Nov 2000
Location: Tristate Area
2001 Impreza Rs


black plugs means your running rich...white means your running lean....brown is favorable

[This message has been edited by suby ej25 (edited December 30, 2000).]
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