P0781 '99 Expy? - TCCoA Forums
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post #1 of 3 (permalink) Old 02-07-2008, 04:01 PM Thread Starter
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P0781 '99 Expy?

My overdrive light started flashing in my '99 Expedition 5.4L. I came home and found this code with my scanner. It is a 1-2 shift error, and it drives great with no problems..........for most of the day. Ocassionaly, I can feel a slight "slipping" but not really a "slip" It kinda feels like the trans is lost between gears. And, it might happen, or I might be able to drive all day and it not happen at all.

I have always been scared about auto transmissions. I purchased this truck with a little over 70K on it and it now has 93k. I dont believe the fluid has ever been changed. It is still bright red and doesnt smell burnt. I am really unsure what to do next. Hopefully not a rebuild?

once again, any info appreciated!

'97 LX - SCT Chip Tuned By Lonnie, 70mm Throttle Body, 80mm MAF, K&N Panel, Stock Airbox - Resonator Removed, 2.25 True Dual Exhaust w/ Mid mounted Magnaflow 3" Oval Tips, T/L 3.27, Mark VIII Driveshaft, 22C Plugs, 180 T-Stat

'99 Expedition Eddie Bauer 4x4
SCT - Troyer Tuned, Air Force One Intake, MSD Ignition, Flowmaster Duals, Lifted, 35" BFG's, Removed Door Moldings, More to Come
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post #2 of 3 (permalink) Old 02-07-2008, 05:18 PM
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sounds like a possible sticky solenoid. You might try to obtain a pinpoint test for that code and see where it leads you.

Originally Posted by Mitch Hedberg
"Escalator Temporarily Stairs. Sorry For The Convenience."
Originally Posted by cougar_guy04 View Post
Red Green, is that you? Might consider looking into fabbing an intake setup that isn't so, well, ghetto.
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post #3 of 3 (permalink) Old 02-09-2008, 10:16 PM
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Does it have the 4R70W or the 4R100? I know my fathers 00 5.4 Expy has the 4R100, but I don't know what other years got it.

97 Mark VIII LSC/Silver/Gray leather
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89 Cougar LS 3.8/Oxford White/Gray velour/HG need replaced AGAIN
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