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Old 04-24-2016, 09:21 AM   #1 (permalink)
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Default Help Reading Plugs

I consider myself 'OK' at reading plugs, but these got me a lil confused lol

Insulators are white, down to the very bottom, then barely turn light tan. But the ring around the top is solid black.

And I can see/read the timing mark.

Heat range looks good to me.

Car runs great, but Im getting -16% on the long term fuel trim, damn OBD2... tail pipe is solid black also. New O2 sensor, ect.




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Take it from somebody who has actually done it more then once and not read about it on the internet......
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Old 04-24-2016, 09:24 AM   #2 (permalink)
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My other concern is, Its been reading the same long term trim, indicating rich condition. but Ive recently added a bigger cam, and ported intake manifold. 4-1 header and 2.5 exhaust. Reset teh ecu after installing new O2 last week. Also advanced the ign timing 3-4 degrees.
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Old 04-24-2016, 11:58 AM   #3 (permalink)
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What ecu, P2P?
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Old 04-24-2016, 12:06 PM   #4 (permalink)
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Originally Posted by CustomY8 View Post
What ecu, P2P?
Actually its a Mazda lol My 99 MX5
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Built trans, 4.90fd

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