Transmission apparently controlled by crackheads on meth. - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 13 (permalink) Old 01-27-2015, 01:08 AM Thread Starter
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Transmission apparently controlled by crackheads on meth.

So I just got my early 99 F250, and while driving easy the transmission shifts nice and smooth...but when you get on it, it gets confused going into 3rd and OD and will go in and out harshly (sometimes), also my TCC is crazy...when you get on it some (about 3/4 throttle) it'll lock in, then when you ease off the throttle to cruising speed (maybe 1/4 throttle) it unlocks and won't lock back in until you are hammering on it again. Fluid looks and smells ok and it never slips...I know these trucks don't shift wonderfully, but I'm wondering if this is normal or if I have bigger problems...
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post #2 of 13 (permalink) Old 01-27-2015, 02:40 PM
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Re: Transmission apparently controlled by crackheads on meth.

Are there any codes stored in the computer's memory?

Mark
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post #3 of 13 (permalink) Old 01-30-2015, 12:51 PM Thread Starter
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Re: Transmission apparently controlled by crackheads on meth.

Not that I've seen. My buddy works at a Ford dealer and hooked it up on their computer and didn't see any. To give kind of an update on its operation...this should be more clear (I was tired when I posted that)

Normal operation (not a lot of throttle, no load):
Shifts normal and smooth as silk...but the TCC doesn't kick in under normal operation...you have to be at about 50% throttle to engage it...and it disengages at around 25% throttle...very frustrating.

Loaded operation (either towing or heavy throttle):
Shifts normal on the 1-2 shift, sometimes on the 2-3 shift...RARELY on the 3-4 shift. Normally slams into 4th. Again, TCC doesn't lock in until 50% throttle. Then unlocks when you go to cruising throttle. So, with a trailer, it's in/out/in/out/in/out...

No codes show...trans fluid looks and smells great. No slippage that I detected...I've been a mechanic 16 years but transmissions are NOT my specialty. Friend did a KOEO and a KOER test as well...with the Ford computer...
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post #4 of 13 (permalink) Old 01-30-2015, 02:16 PM
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Re: Transmission apparently controlled by crackheads on meth.

My SWAG* is that you have a bad throttle position sensor.

*SWAG = Silly Wild A** Guess

Mark
Former Ford Automatic Transmission Engineer

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post #5 of 13 (permalink) Old 01-30-2015, 08:50 PM Thread Starter
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Re: Transmission apparently controlled by crackheads on meth.

Lol I always say Scientific Wild Ass Guess! I put it on my scanner today, here are some things I noticed. It's shifting right when it's told. Doesn't appear to have excessive slip. Clutch coast solenoid never seems to engage. When floored, APP only registers 75%...I'll have to give the TPS a shot...transmission feels great, just feels like it's not getting the right inputs.
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post #6 of 13 (permalink) Old 01-30-2015, 09:09 PM
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Re: Transmission apparently controlled by crackheads on meth.

The coast clutch solenoid should only engage when you turn off OD with the button on the end of the shift handle.

Mark
Former Ford Automatic Transmission Engineer

“The good thing about science is that it's true whether or not you believe in it.” ― Neil deGrasse Tyson
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post #7 of 13 (permalink) Old 01-31-2015, 01:08 AM Thread Starter
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Re: Transmission apparently controlled by crackheads on meth.

Oh I see...like I said, not a trans guy. Where would you recommend getting a TPS from?
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post #8 of 13 (permalink) Old 01-31-2015, 03:55 PM
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Re: Transmission apparently controlled by crackheads on meth.

I usually get parts from a parts store, a Ford dealer, and lately, Rock Auto.

Mark
Former Ford Automatic Transmission Engineer

“The good thing about science is that it's true whether or not you believe in it.” ― Neil deGrasse Tyson
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post #9 of 13 (permalink) Old 02-02-2015, 11:02 PM
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Re: Transmission apparently controlled by crackheads on meth.

Having almost exactly the same issues. Interested to know if a tps fixes it
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post #10 of 13 (permalink) Old 02-18-2015, 01:07 AM
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Re: Transmission apparently controlled by crackheads on meth.

Mark, would you recommend aftermarket valve bodies (or other parts/kits for that matter) for these transmissions?
Mine does fine, but at lower cruising speeds, it likes to lurch into 4th with the TC locked. There's a lot of hear say on what I "need".

Don't mean to hijack!
Thanks, Spencer

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