this post was submitted on 07 Nov 2023
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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.
Yeah like I said I am dumb when it comes to cars and this was years ago so I may misremember. All I know is that if I got my car up over around 50mph it would shake violently and stall when I stopped. Then if it sat for 10-20 minutes it would be ok again (until it got in 4th again). I do know they disabled something that reduced my mpg slightly and I never had the issue again for the 2 years I still had the car. Again I don't remember 100% but I think he literally just unplugged a cable. Charged me 75 for diagnostics and 25 for labor.
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