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| 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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#1
Mon, March 12th, 2012, 07:37 PM
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If you're still having the problem at stock, then it's not the tune. I notice you have a CAI on your truck. What year is the truck? I'm guessing it's not a new model. CAIs on the 04-05 trucks especially can cause the engine to run lean.
Are the throttle body and MAF sensor clean? And, even if the transmission was replaced 6 months ago, it could well be going bad again. - Jack
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 2024 F150 Platinum SCrew 3.5L PowerBoost FX4, Peragon Tonneau Cover, LineX Bed, 35% Window Tint on All Sides and Rear, Full Nose Paint Protection Film, Husky Mud Guards, Lasfit Floor Liners, VIOFO Dash Cam 
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#2
Tue, March 13th, 2012, 07:59 AM
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I have emailed the customer and contacted Bill about this.
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#3
Tue, March 13th, 2012, 12:44 PM
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I've experienced a "slipping" feeling in the low rpms of 4th gear, around that 45 - 60 mph range.
I've got an '04 F150 5.4L and when I would cruise around in 4th and lightly accelerate, the truck would "shudder" or feel like the transmission was slipping, but I could always gas out of it and the truck would drop to 3rd gear, ceasing to shudder. No one could figure it out until 1 day, the check engine light came on and the truck started misfiring. 1 new ignition coil later and my 4th gear slippage disappeared. It's happened 3 times in all in the span of 2 years. When the truck starts to "slip" in 4th gear, my mechanic can find a coil that is bad.
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| Tags |
| custom tune, p2105, slipping, tranny, u0300 |
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