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Discussion Starter #1
I have a 1995 Bronco, 351W, E4OD, and 112,000 miles on the clock (factory oil cooler and auxilliary tranny cooler)

Yesterday, on my way home from work (87 mile commute) it started shifting hard through the gears (I only noticed during acceleration). It didn't seem to matter how hard or soft I'm accelerating.

When I first got to work, I did a quick check of the tranny fluid. It was OK.

I also checked all of my fuses and they are all good.

I just ran a KOEO test during lunch and pulled the following codes:
116 - ECT out of self test range 0.3 to 3.7 volts.
636 - TOT sensor voltage out of self test range.
121 - Closed throttle TPS voltage higher or lower than expected.
114 - ACT out of self test range 0.3 to 3.7 volts.

These all make sense because I did these tests about 4-5 hours after the truck was shut off.

Does anyone have any suggestions? I don't know what else to try and I don't think the tranny would die without any slower symptoms. I had heard TPS or the MLP Sensor (is this same as the Neutral Safety Switch)?
 

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Crusher Mike
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6,115 Posts
the E40D Is like a woman you cant figure it out. One day it will be fine the next day it acts like you abused it. Mine slip shifts into third had it rebuilt and it still does it. I had it checked but 3 shops they said there was nothing wrong. who knows.
 

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Discussion Starter #4
Gacknar said:
Test the TPS.

Drive it, get it to operating temp and run the test again.
Good suggestion, I'll give it a try.

stangmata50l said:
Next, check your connection to your solenoid pack on the pass side.
Not to sound like an idiot, but what's this "solenoid pack"? :brownbag

Underhood, under vehicle?
 

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Discussion Starter #5
I ran another KOEO test after driving home tonight, so the truck had been running for about 1.5 hours.

Results:
121 - Closed throttle TPS voltage higher or lower than expected.
628 - Converter clutch error (E4OD)

Could the 121 mean that the TPS is going? Does the 628 mean that I'm in for a converter replacement?
 

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Discussion Starter #6
stangmata50l said:
The Code 628 is leading me to believe that it is the issue.
I saw your pictures in this thread.

Do you think the connector would be dirty/corroded, and needs to be cleaned and re-attached or is this a "replace the solenoid pack" fix?
 

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Discussion Starter #7
So I should be able to pull that sheetmetal cover and access the plug from the outside, correct?
 
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