Erratic torque converter lockup after new tires? - Ford Powerstroke Diesel Forum
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Old 07-28-2013, 04:03 PM
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Erratic torque converter lockup after new tires?

I found some posts related to torque converter lockup issues but they all referenced bucking and shaking. Mine does not do this.

What mine is doing occurs at lockup in 5th gear. It varies in firmness from hard to very soft. When the lockup is soft I hear the rpms change more slowly. I have an Edge CTS to watch it.

It started the same day I got 4 brand new tires (same stock size) but I can't see a reason that would make a difference. Coencidence?

The trans is original and the fluid was changed about 50k ago. I am using the tow tune from ID.

Thank you in advance
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Old 07-28-2013, 07:51 PM
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I thought I might add that my trans temp seemed higher than normal for unloaded. It was only 85 degrees today and I was seeing temps around 160 which seem higher than I remember but I could be mistaken...
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Old 07-28-2013, 09:48 PM
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It could be the shift pressure and temperature causing the different lock-up or up-shift. If you could ensure you had the exact same parameter before, that would help. I have noticed similar results with 2 ID tunes, but the driving parameters are probably the underlying cause. FWIW, I don't see 5th locking hard or even very often with the tow tune. However, I know when it is in 5th or 6th via the firmness on the upshift.
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Old 07-29-2013, 07:41 PM
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I dont think the temperature means much. It only went to 150-155 today and occured only one time.

It feels like the converter is locking in two steps based on the change in RPM and engine sound. I'm trying to follow the rpm by the tach but its difficult when driving 50+ mph.
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Old 07-29-2013, 07:51 PM
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If you have a monitor that will show TC slip PID, you can learn a lot about the tunes. I was surprised to see I was leaving over 1500 rpm on the floor when I did a dyno run due to the converter not being locked for the run! Who would have though one race tune would not be locked in 5th for the money shot. It wasn't Eric's Xtreme.
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Old 07-30-2013, 01:53 AM
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Try unplugging the batteries for 5 or so minutes then take it for a normal drive. sometimes the PCM and trans will re-learn and drive better.
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