Rpms randomly going up while driving
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Cross-Country
Joined: Nov 2018
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Rpms randomly going up while driving
Hi guys, I have a 2001 f350 4x4 with an auto trans. I’ve ran into a problem lately when I’ll be driving at a constant speed and my Rpms randomly go up and back down. It runs great when I give it a lot of gas but sitting at a constant speed the rpms move up a lot and almost jerk the truck. I’ve noticed that it really only seems to happen when the motor is at full operating temp. Also, the slower I’m going I’ve noticed the more the rpms go up. I’ve done a little research and might think it is the ICP but I honestly don’t have a clue. Any thoughts?
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Cross-Country
Joined: Nov 2018
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I also forgot to say I haven’t experienced a rough idle. It will however, when it’s cold, rev up if it’s just sitting for a few and stay at that point until I touch the brake or gas. I’m pretty sure this is normal but not sure
Hotshot
Joined: Mar 2014
Posts: 10,750
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From: Douglassville, PA
That would be my prime suspect too. Does speed increase too, or not?
Tuned
Joined: Apr 2009
Posts: 394
Likes: 1
From: DFW
Does the speed of the truck go up as the motor RPM does? He initial explanation is not clear on that. So could be the trans slipping or TC unlocking as mentioned
above.
above.
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Cross-Country
Joined: Nov 2018
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The speed might go up a little. The rpms go up really quick then back down so I really can’t tell. It only seems to happen when the truck is fully heated up.
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Laughing Gas
Joined: Jul 2018
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From: Prescott, AZ
Torque Pro can read your TC slip - $5 Android app, $30 Bluetooth OBDII adapter, download the Ford SuperDuty-specific PIDs. It will pay for itself very quickly as your truck ages.
Though I've never used it for TC slip, I'm certain Forscan can read it as well... and it's an even more beneficial tool in other areas. The program is free, you need a Windows laptop and a compatible adapter.
Though I've never used it for TC slip, I'm certain Forscan can read it as well... and it's an even more beneficial tool in other areas. The program is free, you need a Windows laptop and a compatible adapter.
Thread Starter
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Cross-Country
Joined: Nov 2018
Posts: 76
Likes: 0
Torque Pro can read your TC slip - $5 Android app, $30 Bluetooth OBDII adapter, download the Ford SuperDuty-specific PIDs. It will pay for itself very quickly as your truck ages.
Though I've never used it for TC slip, I'm certain Forscan can read it as well... and it's an even more beneficial tool in other areas. The program is free, you need a Windows laptop and a compatible adapter.
Though I've never used it for TC slip, I'm certain Forscan can read it as well... and it's an even more beneficial tool in other areas. The program is free, you need a Windows laptop and a compatible adapter.
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Cross-Country
Joined: Nov 2018
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,709
Likes: 2,629
From: SE Florida
Torque Pro can read your TC slip - $5 Android app, $30 Bluetooth OBDII adapter, download the Ford SuperDuty-specific PIDs. It will pay for itself very quickly as your truck ages.
Though I've never used it for TC slip, I'm certain Forscan can read it as well... and it's an even more beneficial tool in other areas. The program is free, you need a Windows laptop and a compatible adapter.
Though I've never used it for TC slip, I'm certain Forscan can read it as well... and it's an even more beneficial tool in other areas. The program is free, you need a Windows laptop and a compatible adapter.