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Car slows when foot off the gas to coast

 
Old 02-20-2019, 03:10 PM
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Car slows when foot off the gas to coast

Hi everyone! So like the title says, when i take my foot off the gas around 40mph to coast to a stop lght, the car slows down a slight amount. Now when i put it in neutral to let it coast, its normal and the car continues at a regular speed. Its not a huge difference, but it is noticeable. What is the issue here? I read about resetting the computer to have the computer relearn a driving style and reset the usual shift points, so should i change transmission fluid and clean pressure switches and all that?
Thanks!
2005 Tl, Base Auto, 40k miles
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Old 02-20-2019, 03:14 PM
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What makes you think there is an issue?
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Old 02-20-2019, 04:14 PM
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that normal for any car, try do it on a bike and you will see it slow down much quicker than car. its just physics...
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Old 02-20-2019, 04:47 PM
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Old 02-20-2019, 06:27 PM
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Originally Posted by thoiboi View Post
lmfaoo, THIS
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Old 02-20-2019, 07:06 PM
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Originally Posted by truonghthe View Post
that normal for any car, try do it on a bike and you will see it slow down much quicker than car. its just physics...
yes i realize this, this is my 5th car and the first car to do this. Its like its engine braking when im coasting, and slows down at a rate faster than normal that it would be if it was coasting in neutral
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Old 02-20-2019, 07:36 PM
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Originally Posted by Lbeyy View Post

yes i realize this, this is my 5th car and the first car to do this. Its like its engine braking when im coasting, and slows down at a rate faster than normal that it would be if it was coasting in neutral
You do realize that is what is supposed to happen, don't you? Try this, take your foot off the gas, then downshift to 4th gear, then to third; the deceleration will increase each time you downshift.
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Old 02-20-2019, 07:37 PM
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Originally Posted by Lbeyy View Post
yes i realize this, this is my 5th car and the first car to do this. Its like its engine braking when im coasting, and slows down at a rate faster than normal that it would be if it was coasting in neutral
I believe you just answered your own question with this statement... Of course the car would slow down at a faster rate if you are in a gear, as opposed to being in the neutral position...you just said it, "engine braking".
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Old 02-20-2019, 07:39 PM
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Check the brakes. Sticky calipers could slow down the car while coasting
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Old 02-20-2019, 07:52 PM
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Originally Posted by theCoffeeFiend View Post
Check the brakes. Sticky calipers could slow down the car while coasting
He said the car doesn't slow down in neutral; definitely not sticky calipers.
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Old 02-20-2019, 07:56 PM
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Originally Posted by theCoffeeFiend View Post
Check the brakes. Sticky calipers could slow down the car while coasting
I thought this too until I read this:
Originally Posted by horseshoez View Post
He said the car doesn't slow down in neutral; definitely not sticky calipers.
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Old 02-20-2019, 07:57 PM
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n this case it's engine/transmission load braking and not necessarily just engine braking. When you're in neutral, you remove the load of the transmission gears and the engine itself




Long story long, it's normal..
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Old 02-20-2019, 08:11 PM
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If it bugs you, try applying a very, very slight amount of pressure on the gas pedal. You'll still eventually slow down, but I've found it seems to stop the downshifting from happening too prematurely.
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Old 02-21-2019, 06:32 AM
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I know what the OP is talking about. It's a deceleration that is sort of like a jerkiness to the transmission when your foot is off the gas pedal. It's normal for this car.
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Old 02-21-2019, 11:37 AM
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could it be Honda's grade logic he's referring to?
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Old 02-21-2019, 12:49 PM
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Old 02-21-2019, 01:04 PM
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The next question in this thread will be, "How come when I push the gas pedal to the floor my TL accelerates way faster than any car I've ever had; especially my Corolla? Is that normal?"
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Old 02-21-2019, 03:11 PM
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Old 02-22-2019, 08:30 AM
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"I ran out of gas and can't start my car and have yet to fill it up. It turns over like it wants to start but do you think I have a spark plug issue"
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Old 02-22-2019, 10:13 AM
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When you let off the accelerator the throttle body closes creating negative pressure (high manifold vacuum) which the cylinders have to work against. At that point the wheels are pushing the engine rather than the other way around so naturally you get a drag effect which slows you down faster. If you put it in neutral, the throttle body opens just enough to allow the engine to idle without restriction while the wheels rotate freely.

That's one of the huge benefits of a manual transmission (though you can do it with an auto, just not as easily). You can downshift quickly causing significant engine braking due to higher RPM's which helps keep traction when the tires are slipping. It's saved me on more than one occasion. I've done it in an auto as well but it's not nearly as responsive.
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Old 02-27-2019, 08:59 AM
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Old 02-27-2019, 09:11 AM
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This is completely normal operation of the Acura Grade Logic transmission software. The ECM keeps the transmission in a lower gear to use engine braking.
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Old 03-02-2019, 04:47 PM
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jeezus
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