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1997 to 2003 F-150 4.2L, 4.6L, and 5.4L equipped F-150s

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Old Mon, November 12th, 2012, 11:11 AM
rdm_01 rdm_01 is offline
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Default 03 Screw FX4 lean code

I'm getting lean codes on canned tow tune. I know this isn't right, but is there anything I can do other than not use it until I get custom tunes. I have the 5.4L, gotts mod, drop in k&n, and dual exhaust with a "H" pipe and flowmasters. Any help will be appreciated.

Thanks,

Rob
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Old Mon, November 12th, 2012, 11:24 AM
rdm_01 rdm_01 is offline
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Forgot to mention I have the Gryphon CTS programmer.
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Old Mon, November 12th, 2012, 12:08 PM
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Rob, I think you probably SHOULD set the tune to stock until you can get a custom tune to compensate for the H-pipe exhaust. I don't think the K&N filter is any problem, and neither is the Gotts intake mod, but the exhaust must be interfering with the fuel trims.

You MIGHT be OK using just the Level 1 tune though, since it effects only the transmission. I think I'd try that first.

- Jack
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Old Mon, November 12th, 2012, 07:03 PM
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Thanks for the reply. I'm going to get custom tunes, but in the mean time, i was looking for a solution other than turning the Gryphon CTS into an expensive gauge. Is there anything that I can do, or am i just stuck until I get custom tunes?
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Old Tue, November 13th, 2012, 03:45 PM
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As I said, try Level 1. That gives you a stock tuned engine and an improved transmission.

- Jack
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