What happens at 1750 RPM - Ford Powerstroke Diesel Forum
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Old 03-21-2010, 07:23 AM
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What happens at 1750 RPM

I'm wondering if anyone else has noticed this.

As the engine revs up while going through each gear, everytime the truck hits about 1750 RPM, I feel a slight hesitation. Kinda reminds me what a car under a load feels like when you turn the A/C compressor on. Do our trucks have something that kicks "on" at about that RPM? It is very noticable and only under light acceleration. If I accelerate with a lot of throttle through that RPM, it isn't nearly as noticeable. But it definitely happens right about 1750...like clockwork.

I have a manual transmission so I know it isn't something there.
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Old 03-21-2010, 07:35 AM
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Part throttle, WOT, all the time?
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Old 03-21-2010, 07:37 AM
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Quote:
Originally Posted by s8v4o View Post
Part throttle, WOT, all the time?
Pretty much any time I'm not using WOT. It might happen when I am at WOT but the engine revs past 1750 so fast that I don't really notice it.
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Old 03-21-2010, 07:44 AM
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I have a manual transmission and I notice it too. That hesitation went away with tuning. Also my fourth gear seems to have more noise than the other gears, is yours the same?
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Old 03-21-2010, 07:45 AM
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Wondering about this as well. My truck does the exact same thing.
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Old 03-21-2010, 07:51 AM
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Quote:
Originally Posted by my1stdiesel View Post
I have a manual transmission and I notice it too. That hesitation went away with tuning.
I haven't tuned mine...

Quote:
Originally Posted by my1stdiesel View Post
Also my fourth gear seems to have more noise than the other gears, is yours the same?
I haven't noticed 4th gear sounding any different.
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Old 12-12-2011, 11:25 PM
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Originally Posted by black99stroker View Post
Wondering about this as well. My truck does the exact same thing.
Did you ever find out what this was? I still don't know what it is but it is definitely there still with 30k miles.
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Old 12-23-2011, 04:28 PM
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Injection timing changes ... helps smooth shifting and "unloads" the transmission for longevity. Also hear more rattle at certain timing points compared to others. Just what I could conclude from watching the dashdaq ...
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Old 12-23-2011, 04:54 PM
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Wish there was way to get rid of it. With a manual transmission, not sure why it would be there. It's frustrating. Definitely not smooth power delivery
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Old 12-23-2011, 08:46 PM
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Yeah you got me on the manual ... not to derail the topic but I know when trying to bring RPM up nice and easy in park/neutral it will do some strange non-linear accel/decel.
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