why does my damn e40d rarely downshift? - Ford Powerstroke Diesel Forum
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Old 04-28-2012, 07:14 AM
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why does my damn e40d rarely downshift?

It seems that my truck is very stubborn to downshift sometimes. Last night there 5 people in my truck and I was trying to merge on the highway, and since it didn't downshift it took like a whole minute to reach 60mph!
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Old 04-28-2012, 08:01 AM
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My buddies truck is somewhat doing the same thing, when it gets into a hard pull it wont downshift so the truck starts to shutter instead of going
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Old 04-28-2012, 09:25 AM
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Mine doesnrt shutter, its just got zero power because the rpms are so low
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Old 04-28-2012, 09:31 AM
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maybe the skinny pedal is screwing up? someone correct me if i am wrong but the kickdown position is controled by pedal position? (being as it's pretty much fly by wire - no cables)
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Old 04-28-2012, 09:39 AM
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does u're speedo bounce at all? maybe speed sensor screwing around too?
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Old 04-28-2012, 01:07 PM
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Yes my speedo bounces around a bit.. Figured its from my lift and tires.

I found out the problem (kinda). Third gear shifts MUCH too early sometimes, and I mean super early, and the only way to kick down is putting it into 2nd gear.
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Old 04-28-2012, 05:14 PM
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yup, if u're speedo is jumping then i would look into replacing the speed sensor ontop of the rearend. that could be why it's shifting early into 3rd (thinking that it's going faster than it really is) hope u find the issue
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Old 04-28-2012, 06:09 PM
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Did you correct your speedo for the larger tires?
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Old 04-28-2012, 06:19 PM
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No I didn't not correct my speedo for the larger tires. I thought a tuner could do that, but they can't, I heard ts has a speedo corrector or something?

I thought its as simple as swapping a sensor in the tranny or someything, but I'm open to ideas.
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Old 04-28-2012, 06:47 PM
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You have to recalibrate the psom when you change tire size or gearing. A chip will not recalibrate but it can change shifting points. It can be done at a dealer or do a search for speedometer recalibration. I thought I had it bookmarked but don't and have to wade through a lot threads to find the right one.

Edit: found this http://www.thedieselstop.com/forums/...on-how-155177/

Last edited by 1Dieselman; 04-28-2012 at 06:59 PM.
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