E450 Shifting At 2000rpm Max - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 03-08-2014, 08:56 PM Thread Starter
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E450 Shifting At 2000rpm Max

So I've been trying to figure out why for the last couple of weeks the transmission in my E450 shifts at a maximum of 2000rpm. It started acting this way on a very cold day. I was driving along at about 65mph, when the truck let out a shudder for maybe a second. I crawled underneath to see if anything came loose or if I was losing oil, but all was good. Since then, even with the throttle wide open, I'm only seeing shifts at 2000rpm max and no kick down, 99% of the time. The other once or twice, it acted normally and held a gear til over 3000rpm and would kick down, then revert back to low rpm shifting. Transmission oil level is fine, oil looks and smells clean (it just came out of service as an ambulance, so maintenance is not an issue). The shifting is smooth and positive, so if anyone has an idea what ity could be, I'd really appreciate some input.

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post #2 of 5 Old 03-23-2014, 08:08 PM
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Honestly? As dumb as it sounds it may be fuel injector related due to severe lack of power issues from delayed timing caused by sticking spool valves.

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post #3 of 5 Old 03-23-2014, 09:30 PM Thread Starter
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You know, it's strange, but about a week ago I got playing with the cruise control as I was driving down the highway and after tapping the accelerate and coast buttons a couple of times, the transmission all of a sudden began to function normally once again. Absolutely no idea what that is all about. No idiot lights came on, nothing! After spending hours looking for a solution on line and phoning a few people well familiar with these drive trains, no one seems to have a clue.
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post #4 of 5 Old 03-24-2014, 02:26 PM
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It could quite easily be caused by a frozen EBP sensor or blocked tube. This type of event happens typically when you go from warmish to very cold temperature.

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post #5 of 5 Old 03-24-2014, 03:41 PM Thread Starter
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Blocked tube, I'm thinking. Being that screwing with the cruise control, which is unless I'm mistaken, still vacuum controlled. So whatever was inside the tube, probably a chunk of ice, wiggled its way out. But the temperature did indeed turn very cold the day it began acting up. Nicely interpreted!
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