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this post was submitted on 07 Nov 2023
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Asklemmy
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I'm not mechanical in any way but it sounds very similar to what happened to me. It turned out to be some issue with the transmission. There is something called overdrive or something like that where when you go in 4th gear it engages and you get better highway fuel economy. The problem was it would engage but would get stuck and not disengage which would stall the engine (and shake the car violently) when coming to a stop. I took it to a mechanic and they gave me an option. Fix it for 2000 or disconnect it for 100. I disconnected it and I lost maybe 1-2mpg while driving freeway. Some cars have a button to turn off overdrive so you could try that if yours does.
That sounds like the torque converter lockup clutch. The torque converter is a fluid coupling between the engine and transmission. It will always have some slip. In the 80s they started putting clutches in them to get those 2 mpg you described. Yours must not be disengaging properly, I've never seen one fail like that.
Actually reading your comment again "Torque Converter" sounds really familiar so that's probably it. If we are running a pool I got $5 on stuck torque converter lockup clutch.
I do have an overdrive switch, and when it's on it shows up on my dashboard. It wasn't on, it's not something I use but I've accidentally switched it a couple of times.
I've never heard anything about a "Torque Converter" on my car, but I'll keep that in mind as a possibility. Thanks