Clunky Transmission - or Grade Logic? - Drive Accord Honda Forums | radio-pro.ru
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post #1 of 9 Old 11-07-2006, 03:36 PM Thread Starter
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Clunky Transmission - or Grade Logic?

Hi foliks.

Quick survey, I just purchased a new to me 2004 accord EX-L V6 Auto.

There is a quirky transmission issue I've noticed, and I've also noticed this on my girlfriends 2002 civic LX Automatic.

I saw this thread:
Transmission shift between 40-50 mph?

This somewhat describes my issue. There is definately often a "downshift" during deacceleration which I have never noticed on any other automatic.

I also notice a slight surge during upshifts in my Accord (not on the 2002 civic). Most noticeably from first to second the car seems to lunge forward a bit during the shift.

My brother has a 2004 Mazda 6s. Today I went from driving my accord directly to his Mazda 6, and noticed his automatic transmission was much smoother and less noticeable. (No downshifts, no lurching upshifts). As a side note, his car was termendously louder in the cabin, didn't have as much power, and didn't feel nearly as heavy on the road as my accord, so I have no regrets

I bought the car used, I have no idea if the car was repaired or inspected under the tranny recall. If people here believe this is an issue inherent in good running cars w/ Honda, then I will accept it, it's nothing more than a mere concern in my mind of a tranny problem.

The grade logic control explains the sometimes jerky downshifts, the upshifts though are a different story. I have always driven 5-speed manuals, my first automatic, so I don't have a ton of experience. But I've driven a ton of older automatics of various brands throughout the years and never noticed this.

Does everyone experience this?

Thanks,
Justin

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post #2 of 9 Old 11-07-2006, 04:14 PM
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it seems like what you are describing is normal for a honda AT.....

i'll let the other members on here elaborate further...


current car: 2007 Honda Accord LX-SE 4dr 2.4 MT 17xk miles (slowly and gradually nursing her back to health)

prior vehicles:
2007 Honda Accord LX Coupe 2.4 MT (409k miles, RIP)
1999 Honda Accord coupe (197k, blown head gasket)
1993 Honda Accord (retired 369k)
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post #3 of 9 Old 11-07-2006, 09:50 PM
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It sounds normal.. The Accord's AT tranny likes to use engine braking a LOT... You can feel the 4-3, and 3-2 downshifts pretty easily.
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post #4 of 9 Old 11-07-2006, 10:19 PM
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Haven't really felt the 4-3 downshifts, but definitely the 3-2 and I think 2-1 downshifts if memory serves me correctly.
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post #5 of 9 Old 11-08-2006, 01:03 AM
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downshifting during acceleration is a good thing. it's called responding to the driver's inputs. unlike some "retarded" automatics that will still putter along in overdrive after you slam your foot to the floor.

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post #6 of 9 Old 11-08-2006, 10:16 AM
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Quote:
Originally Posted by VTECaddict
downshifting during acceleration is a good thing. it's called responding to the driver's inputs. unlike some "retarded" automatics that will still putter along in overdrive after you slam your foot to the floor.
This is downshifting during deceleration... You'll definately notice it if you hit a dip in the road while you're braking on a downhill slope!

namegoeshere, 4-3 is very light, but you could still feel it. The car won't do a 2-1 downshift unless you're going 5mph so the downshift you felt should be a 3-2 downshift.
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post #7 of 9 Old 11-08-2006, 10:48 AM
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All I know is that when I slam on the gas (in a '06 V6 auto), the car kinda rolls along in a pause for a moment, then it blasts forward. It's kinda like those space ships in those sci-fi flicks; their engines in back glow blue, then Zooooosssssshhhhhh!
Hopefully when I get that new V2 intake, that pause will be less obvious and shorter

As for the downshifting during decelleration, I feel the grabby brakes more than anything.
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post #8 of 9 Old 11-08-2006, 11:23 AM
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Half-Breed, what you're experiencing is either a two gear downshift or a slow-ish downshift. It's unavoidable in ATs although it has gotten better over the years since the trannys shifts faster than ever before.

The extra grabby brakes during decelleration was probably because of the EBD/ Brake Assist... You hit a bump in the road during decelleration and press the brake pedal a little further down and the computer thinks you're in a panic stop situation and brakes harder.
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post #9 of 9 Old 11-08-2006, 01:01 PM
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Quote:
Originally Posted by SSMV6
This is downshifting during deceleration... You'll definately notice it if you hit a dip in the road while you're braking on a downhill slope!

namegoeshere, 4-3 is very light, but you could still feel it. The car won't do a 2-1 downshift unless you're going 5mph so the downshift you felt should be a 3-2 downshift.
whoops. my brain was overloaded with chem last night so it wasnt functioning correctly.

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