Thump noise with quick acceleration
#1
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Hey friends I have a 99 GS 300. When I am accelerating for example getting ready to pass another vehicle, when I accelerate quickly I here a thump noise and there is a gap in pressing the accelerator and the car accelerating. If you have a solution to this I would appreciated it. My GS 300 also has a very quick and fast acceleration from a starting position. It really takes off quickly. Is this normal?
#6
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Motor Mounts should be the first thing you check
https://www.clublexus.com/forums/gs-...downhills.html
https://www.clublexus.com/forums/gs-...downhills.html
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#8
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Fair warning... Both Lexus and my independent mechanic said my mounts were fine (they split at the top and it's hard to see when the engine is compressing them. When we removed them finally months later after chasing other things, the driver side mount showed this:
Does your car moan/growl when braking hard, especially when braking hard going down steep hills? Any clunks from the front end when going over bumps?
Also, if it's your mounts, it will be more noticeable when you stomp the gas from a standstill than stomping the gas from a roll.
Does your car moan/growl when braking hard, especially when braking hard going down steep hills? Any clunks from the front end when going over bumps?
Also, if it's your mounts, it will be more noticeable when you stomp the gas from a standstill than stomping the gas from a roll.
![](http://i199.photobucket.com/albums/aa213/luke87gt/brokenmount_zpsf9996e00.jpg)
Last edited by BayAreaLex; 03-10-13 at 06:52 PM.
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Fair warning... Both Lexus and my independent mechanic said my mounts were fine (they split at the top and it's hard to see when the engine is compressing them. When we removed them finally months later after chasing other things, the driver side mount showed this:
Does your car moan/growl when braking hard, especially when braking hard going down steep hills? Any clunks from the front end when going over bumps?
Also, if it's your mounts, it will be more noticeable when you stomp the gas from a standstill than stomping the gas from a roll.
![](http://i199.photobucket.com/albums/aa213/luke87gt/brokenmount_zpsf9996e00.jpg)
Does your car moan/growl when braking hard, especially when braking hard going down steep hills? Any clunks from the front end when going over bumps?
Also, if it's your mounts, it will be more noticeable when you stomp the gas from a standstill than stomping the gas from a roll.
![](http://i199.photobucket.com/albums/aa213/luke87gt/brokenmount_zpsf9996e00.jpg)
#12
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Next, GS300's don't offer "break your neck" take offs unless what you are describing is a sudden and momentary jerk/thud right as you hit the gas from a stand-still, which is what attempted to describe to you.
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I'm not sure what gives you this idea as I still think all signs point to your mounts.
Next, GS300's don't offer "break your neck" take offs unless what you are describing is a sudden and momentary jerk/thud right as you hit the gas from a stand-still, which is what attempted to describe to you.
Next, GS300's don't offer "break your neck" take offs unless what you are describing is a sudden and momentary jerk/thud right as you hit the gas from a stand-still, which is what attempted to describe to you.
Also, if it's your mounts, it will be more noticeable when you stomp the gas from a standstill than stomping the gas from a roll.
I did not describe a moan/growl when braking nor did I say anything about going over a bump. I will get my mounts checked and replaced if necessary, but again, what you are describing are not my symptoms.