04 4R100 question
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Elder User
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04 4R100 question
truck in signature is the problem. only issue im having is when i let off the gas in 3rd gear or maybe even overdrive, itll come out of lockup. then when i repress the accelerator, the rpms go up 250rpms then it relocks. fluid has been replaced every 25000 miles. truck has almost 60000 on it.
Logistics Pro
Joined: Mar 2002
Posts: 3,881
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From: Wake Forest, NC
Normal operation unless this is something new that you noticed? AFAIK, that is how they are supposed to be on the gas motors. The diesel keeps it locked after a certain speed, but they (most manufacturers do this as well) do it on the gas ones to make it smoother and reduce the chuggle effect.
Elder User
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truck in signature is the problem. only issue im having is when i let off the gas in 3rd gear or maybe even overdrive, itll come out of lockup. then when i repress the accelerator, the rpms go up 250rpms then it relocks. fluid has been replaced every 25000 miles. truck has almost 60000 on it.
Former Vendor
Joined: Sep 2000
Posts: 2,627
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From: South Carolina
Dkf is right most custom tuning address’s this issue. Most people like converter to stay locked.
Some key things in a PCM that have an effect on a locked torque converter.
Throttle Position
Brake Input
Throttle Rate of movement In or Out
Time
Vehicle Speed
These are typical scalars in a PCM
Throttle Position to Not Unlock With Brake
Throttle Position to Open Converter at Closed Throttle
Throttle Rate to Unlock HiTP Tip In
Throttle Rate to Unlock HiTP Tip Out
Throttle Rate to Unlock LowTP Tip In
Throttle Rate to Unlock LowTP Tip Out
Time to Remain Unlocked After Brake Input
Vehicle speed Above to Remain Locked at Close Throttle
Some key things in a PCM that have an effect on a locked torque converter.
Throttle Position
Brake Input
Throttle Rate of movement In or Out
Time
Vehicle Speed
These are typical scalars in a PCM
Throttle Position to Not Unlock With Brake
Throttle Position to Open Converter at Closed Throttle
Throttle Rate to Unlock HiTP Tip In
Throttle Rate to Unlock HiTP Tip Out
Throttle Rate to Unlock LowTP Tip In
Throttle Rate to Unlock LowTP Tip Out
Time to Remain Unlocked After Brake Input
Vehicle speed Above to Remain Locked at Close Throttle
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liljase
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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Dec 11, 2003 10:38 PM
