Underdrive Pulleys - Power Hungry Performance Forum

		Power Hungry Performance Forum > Ford F-150, Expedition, Navigator, Blackwood, Mark-LT, SVT Lightning and H-D Editions (Disabled) > 2004 to 2008 F-150 and Mark-LT
Underdrive Pulleys

2004 to 2008 F-150 and Mark-LT
4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs.

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#36

Mon, May 11th, 2009, 09:51 AM

Jackpine Jackpine is offline

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Join Date: Nov 2008

Location: Among Elk, Deer and Javalinas on the Mogollon Rim in Aridzona

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12.7 sounds low to me. I think I'm always above 13, even in idle with the lights on. You MAY want to raise your idle a bit - maybe 50 rpms or so?

I don't suppose the car wash got the pulleys and belt wet, so they were slipping? I know on my Honda, this can happen when I go through a deep water puddle.

- Jack

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