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4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

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Old 07-04-2008, 07:43 AM   #1  
TreyR
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Default Plugs

I finally got around to installing new plugs today. The old ones were white. I have about 700 miles on them since installing my procharger. I am still running a canned tune, which I thought was rich. They were stock plugs pretty worn out and gapped way to big for forced induction. When in the boost about 4000 rpms and up I got a light shuttering. I figure this to be due to the plugs. I installed new ones 2 steps colder and gapped at 35. Could the white/grey color be due to the plugs or am I just way to lean?
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Old 07-04-2008, 12:53 PM   #2  
TreyR
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Default RE: Plugs

Could the wrong heat range cause this?
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Old 07-04-2008, 05:13 PM   #3  
rob.d
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Default RE: Plugs

Get a wideband hooked up ASAP. It sounds like you are lean. Take it to a dyno and get it tuned correctly.
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