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Does it feel like the torque converter is unlocking while driving down the highway? I'd so it could be as simple as the third brake light. On my 95 when it comes on the computer unlocks the torque converter. I saw mention of it in a thread years ago when I was having trouble and dismissed it. The last thing I did prior to dropping the Trans was replace the bulb and by god it fixed it.
Does it feel like the torque converter is unlocking while driving down the highway? I'd so it could be as simple as the third brake light. On my 95 when it comes on the computer unlocks the torque converter. I saw mention of it in a thread years ago when I was having trouble and dismissed it. The last thing I did prior to dropping the Trans was replace the bulb and by god it fixed it.
middle/3rd brake light is functional. What does it feel like when the torque converter unlocks?
Like the Trans is coming out of gear. Mine was just quick little jerks. I ended up switching mine to LED just so it didn't happen again. Figured when it did I wouldn't be anywhere near a place to get a replacement. Never thought about it but I would guess if the brake switch was acting up it could cause a problem as well.
Like the Trans is coming out of gear. Mine was just quick little jerks. I ended up switching mine to LED just so it didn't happen again. Figured when it did I wouldn't be anywhere near a place to get a replacement. Never thought about it but I would guess if the brake switch was acting up it could cause a problem as well.
yeah, just feels like it’s slipping out of gear for a fraction of a second. Just long enough for the revs to go up and then back to engaged at the correct rpms.
weird, I’ll have to read more about the brake light and faulty switch and the symptoms. Thanks
middle/3rd brake light is functional. What does it feel like when the torque converter unlocks?
To unlock the converter while driving, turn on your hazard lights, with the truck up to speed and converter locked. This will unlock the converter. You can also keep your right foot on the gas, and then with your left foot, gently ride the brake, just enough to turn on the brake lights. So long as you keep on the gas at the same time, you'll feel the converter unlock.
If it feels just like what's happening at times, the first place to suspect the issue is a failing/dirty solenoid pack plug. You should be getting the converter slip code, if it's happened a half dozen or so times.
If you need to look further, though written for the IDI diesel section, the basics apply:
To unlock the converter while driving, turn on your hazard lights, with the truck up to speed and converter locked. This will unlock the converter. You can also keep your right foot on the gas, and then with your left foot, gently ride the brake, just enough to turn on the brake lights. So long as you keep on the gas at the same time, you'll feel the converter unlock.
If it feels just like what's happening at times, the first place to suspect the issue is a failing/dirty solenoid pack plug. You should be getting the converter slip code, if it's happened a half dozen or so times.
If you need to look further, though written for the IDI diesel section, the basics apply:
unable to replicate if I understood correctly.
At speed, with foot on accelerator, engaging the emergency blinker lights did nothing. It stayed in gear at the same rpm.
With foot on accelerator at a constant speed, applying brake at the same time slowed the vehicle, but it remained in the same gear and continued to pull.
Given those results I’m assuming the solenoid/plug is fine?
I’m not getting any codes other than what was in the original post.
thanks again.
looks like I will order a MLPS/neutral safety switch and see if that fixes it.
Originally Posted by FORDF250HDXLT
To unlock the converter while driving, turn on your hazard lights, with the truck up to speed and converter locked. This will unlock the converter. You can also keep your right foot on the gas, and then with your left foot, gently ride the brake, just enough to turn on the brake lights. So long as you keep on the gas at the same time, you'll feel the converter unlock.
If it feels just like what's happening at times, the first place to suspect the issue is a failing/dirty solenoid pack plug. You should be getting the converter slip code, if it's happened a half dozen or so times.
If you need to look further, though written for the IDI diesel section, the basics apply:
With foot on accelerator at a constant speed, applying brake at the same time slowed the vehicle, but it remained in the same gear and continued to pull..
The truck should not have slowed down at all if you did this correctly:
Originally Posted by FORDF250HDXLT
You can also keep your right foot on the gas, and then with your left foot, gently ride the brake, just enough to turn on the brake lights. So long as you keep on the gas at the same time, you'll feel the converter unlock.
When I had the ‘94 Bronco (302/E4OD) I could see the rpms increase on the tachometer by a couple hundred when the converter unlocked.
The truck should not have slowed down at all if you did this correctly:
When I had the ‘94 Bronco (302/E4OD) I could see the rpms increase on the tachometer by a couple hundred when the converter unlocked.
That’s the point I was trying to make. Mine did not seem to unlock or make any changes to the rpms or gear it was in when I pushed the emergency flasher or put my left foot on the brake while keeping the right on the accelerator.
The truck should not have slowed down at all if you did this correctly:
When I had the ‘94 Bronco (302/E4OD) I could see the rpms increase on the tachometer by a couple hundred when the converter unlocked.
Originally Posted by My4Fordtrucks
I dont know about using the hazards to disengage the torque converter but the point I was trying to make is you did the brake pedal test wrong.
understood. I’m just not clear what I did wrong, and I’m not even clear on what should happen…. If working properly, should it drop out of gear when the brake is hit? I should clarify that it only slowed if I engaged the brake enough to slow the vehicle from the resistance…
thanks for the responses.
Hold the accelerator steady. Press the brake pedal only enough to turn on the brake lights, not enough to slow the vehicle. If the torque converter is locked, this will unlock it. You'll see the unlock by the RPM rising a couple hundred RPM with no increase in speed or change to the accelerator position.
Hold the accelerator steady. Press the brake pedal only enough to turn on the brake lights, not enough to slow the vehicle. If the torque converter is locked, this will unlock it. You'll see the unlock by the RPM rising a couple hundred RPM with no increase in speed or change to the accelerator position.
Light pressure to the brake produces no change in rpm or speed so what is that telling me?
thanks
Most likely it is telling you that the torque converter is not locking. I forgot to mention that you need to be at or above 45 MPH to run this test. Below that the converter may not be locked.
