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

How long do plugs last?

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Old 06-27-2006, 05:59 AM
  #21  
Colorado_Mustang
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Default RE: How long do plugs last?

Have you checked the idle port clearance in the carb bores? Holley/Demon generally call for about 0.020" to be showing below the blades at idle. You may also look into changing your air bleeds...
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Old 06-27-2006, 07:44 AM
  #22  
FDNYBullitt
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Default RE: How long do plugs last?

We have found good and bad with different brands but mostly they seem to like the stock Motorcraft plugs when it has just a few mods done to it. usually around 50,000 miles, Ford says 100,000 but thats really a stretch, good luck.
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