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rpm needle bouncing...

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Old 07-17-2005, 01:56 AM
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rpm needle bouncing...

is it normal for the rpm needle to bounce as you let you foot off the gas?

i own a 05 AT, and when im stuck in traffic on the freeway, or just driving around town normally, whenever i let my foot off the gas to slow down, the rpm needle will drop down very quickly, and hit like 800 rpm or 1100 rpm, then bounce back up a couple hundred rpm. is this normal?? i dont remember if it is normal for the needle to do that or not, but i figured since it was dropping rpm so quickly, i guess the needle wouldnt be able to stop "on a dime" so to say. and it doesnt react that way if i just sit in neutral and rev it.....and also, it idles perfectly in park at 650-700rpm

im not sure though, anyone know?
Old 07-17-2005, 03:33 AM
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hmm i think mine does the same thing..not too sure though ill check it out next time im driving my car
Old 07-17-2005, 03:35 AM
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driving a 5AT myself, I've also seen this happen. This only happens in high gears (4,5. sometimes 3). I'm prettysure tis is normal? You were in the manual mode? Or... just automatic? I dont remember seeing it in the full auto mode.
Old 07-17-2005, 03:42 AM
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just AT mode. and with mine it seems to happen when in lower rpms, like when you stuck in traffic, or driving the speed limit around town.
Old 07-17-2005, 04:09 AM
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yea same thing happens to me ill be at 3 and let off the gas and it will drop to 1 1/2 and then bounce a lil and then stay at 1 or 2.. also ill step on the gas and let off really quik and i will feel my car pull back..anybody else feel this
Old 07-17-2005, 12:10 PM
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That sounds like the rev-matching feature that the 05 automatics have.

It's raising the engine rpms to make the downshift smoother.
Old 07-17-2005, 03:27 PM
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It's quite normal. The gauge is reading the engine rpm's which drop quickly, maybe too quickly and then has to jump back up causing a little bounce.
C.
Old 07-17-2005, 03:32 PM
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Quote:
Originally Posted by ketch
yea same thing happens to me ill be at 3 and let off the gas and it will drop to 1 1/2 and then bounce a lil and then stay at 1 or 2.. also ill step on the gas and let off really quik and i will feel my car pull back..anybody else feel this
Yes, when I lift completely off the gas I can feel the drivetrain braking the car.
Old 07-17-2005, 04:27 PM
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you will see the Rpm increase as the car slows and unlocks the converter and shifts to a lower gear, thus increasing the engine rpms
Old 07-17-2005, 04:41 PM
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Quote:
Originally Posted by Gsedanman
It's quite normal. The gauge is reading the engine rpm's which drop quickly, maybe too quickly and then has to jump back up causing a little bounce.
C.
same thing here.

I guss its normal on 05
Old 07-17-2005, 04:42 PM
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i regret not get a six speed lol.. oh well

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accelerator, bounce, bounces, bouncing, braking, g35, g37, jump, jumping, makes, needle, rpm, rpms, slowing, throttle
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