12C plug life expectancy - TCCoA Forums
 
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post #1 of 5 (permalink) Old 06-08-2004, 02:32 PM Thread Starter
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12C plug life expectancy

My highway milage seems lower than normal. It has since last fall, since right around the time my car also ran its slowest 1/4 times since I put in my gears. So, I just finally put 2 and 2 together and decided taht maybe its the plugs although I haven't checked them yet. They've only been in there for about 20k miles though. What is anyone else experience with the 12C plugs? Are they normally pretty short lived?

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post #2 of 5 (permalink) Old 06-08-2004, 07:19 PM
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Only way to tell is to take them out. Once you read the plug, it will tell you the complete story.

I would be ready to replace them. For some reason 10K comes to mind for coppers.




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post #3 of 5 (permalink) Old 06-08-2004, 09:50 PM Thread Starter
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10k miles was mentioned on md also. I am in the process of getting new plugs. I am kind of relieved that I think I have figured out the performance problem and milage drop, I just don't know why it took me as long as it did to think of it.

Former owner of 94 Bird with DOHC 4.6L swapped from a mark VIII

2011 CTS-V Wagon
1968 Torino was an original 289, C4, fully documented numbers matching car. Now: DOHC 4.6L/T-56 swapped, Cobra intake, IMRC delete, BBK long tubes and H pipe. Dynotech Aluminum Driveshaft, 9" rear with TrueTrac and 4.11's.
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post #4 of 5 (permalink) Old 06-08-2004, 10:18 PM
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i checked the ford serivce manual, couldnt find anything, id replace my plugs in the range of 10-20k, if you wanna be extra good to your engine, every 10k

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post #5 of 5 (permalink) Old 06-08-2004, 11:40 PM Thread Starter
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Yeah, I'll probably replace them a little more often in the future. Didn't realize that the life span was that short or the performance/mileage drop off as high as it is.

Former owner of 94 Bird with DOHC 4.6L swapped from a mark VIII

2011 CTS-V Wagon
1968 Torino was an original 289, C4, fully documented numbers matching car. Now: DOHC 4.6L/T-56 swapped, Cobra intake, IMRC delete, BBK long tubes and H pipe. Dynotech Aluminum Driveshaft, 9" rear with TrueTrac and 4.11's.
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