red/orange deposit on NEW spark plugs? bad gas mileage - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

TurDz · 08-04-2005, 04:01 AM

I just installed NGK Iridium IX spark plugs a week ago before the ButtonWillow track event. Well, I added an octane booster before hand, and I recently noticed a drop in gas mileage, especially on the ride back home (~230 miles).

I was curious about the mileage, since the only thing I changed since then was the gas (Chevron to Mobil), NGK wires and plugs. So I checked the plugs just now, and they're all orange. Does anyone know what this means? on this website at the bottom,

http://www.mopar.com/m_maint_inspection_plugs_tune.html

it indicates fuel additive or octane booster depsoits on it.

Did this permanently affect the performance of the plug and would this be the cause of my noticable drop in gas mileage (~19mpg highway w/ a/c). Does it affect overall spark?

If the condition of these plugs creates a non-optimal spark energy, then I will definately just replace them again. help?

Here are the pics, with and without flash:

08-04-2005, 04:01 AM	#1
TurDz Nissanaholic! Join Date: May 2003 Location: Bay Area, CA Posts: 1,618 Trader Rating: (0) Feedback Score: 0 reviews	red/orange deposit on NEW spark plugs? bad gas mileage I just installed NGK Iridium IX spark plugs a week ago before the ButtonWillow track event. Well, I added an octane booster before hand, and I recently noticed a drop in gas mileage, especially on the ride back home (~230 miles). I was curious about the mileage, since the only thing I changed since then was the gas (Chevron to Mobil), NGK wires and plugs. So I checked the plugs just now, and they're all orange. Does anyone know what this means? on this website at the bottom, http://www.mopar.com/m_maint_inspection_plugs_tune.html it indicates fuel additive or octane booster depsoits on it. Did this permanently affect the performance of the plug and would this be the cause of my noticable drop in gas mileage (~19mpg highway w/ a/c). Does it affect overall spark? If the condition of these plugs creates a non-optimal spark energy, then I will definately just replace them again. help? Here are the pics, with and without flash:

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