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Old 05-10-2019, 01:22 PM   #21
Arrex
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Join Date: Jan 2013
Drives: 2013 Scion FR-S
Location: Dallas
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Quote:
Originally Posted by maslin View Post
Idling with the AC off isn't slamming gears while coming to stop. I just can't connect the two.

Torque converter stuck on while you're coming to a stop feels like lugging a manual car. Torque converter stuck on during shifts often feels like a nasty shudder.

Our vans have an issue where the torque converter can't dump pressure fast enough when shifting, and just before you stop. It feels like you hit the rumble strip. We replace the valve body and relearn the torque converter, there's a fix online to drill a hole in one of the valve body end plates to allow pressure to bleed off faster.

I may or may not have have done it before, and it may or may have worked.

A dip in RPM will give that nice shake though the car while it fights to idle, but it's not the same as when the torque converter is sticking.
Appreciate your analysis and now I am even more confident on what one of the shop told me was correct: torque converter behavior is whacked
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