My car jerks if during acceleration, I release the gas pedal - Toyota Nation Forum : Toyota Car and Truck Forums


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7th Generation (1993-1997) Specific discussion of the 7th generation

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Old 09-24-2009, 02:39 PM   #1 (permalink)
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My car jerks if during acceleration, I release the gas pedal

On my 1.6L DX, manual transmission, it is most noticeable in 1st and 2nd gear, if during acceleration, I let go the gas pedal suddenly, the car jerks and nose dip forward for a second or two. Otherwise, the car accelerates smoothy and the RPM increases without jerks if I keep pressing on the gas pedal.

What could be wrong? I don't remember the car doing that before. It has gradually doing that over time and now it is very noticeable and annoying.

Last edited by hungt1999; 09-24-2009 at 02:43 PM.
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Old 09-25-2009, 08:47 AM   #2 (permalink)
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Have you checked your motor mounts, and shocks/struts?
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Old 09-25-2009, 08:52 AM   #3 (permalink)
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Quote:
Originally Posted by zythr View Post
Have you checked your motor mounts, and shocks/struts?
The struts are new

How can I test the engine mounts? which one is the most likely to fail in our cars?
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Old 09-25-2009, 09:47 AM   #4 (permalink)
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To test your mounts, assuming your car has auto tranny, apply brakes while giving a little throttle in "D". The car is NOT moving. Have someone else outside the vehicle to observe if the engine has excessive movement.

With a manual tranny, apply ebrake.
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Old 09-28-2009, 11:07 AM   #5 (permalink)
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Quote:
Originally Posted by BDSL View Post
To test your mounts, assuming your car has auto tranny, apply brakes while giving a little throttle in "D". The car is NOT moving. Have someone else outside the vehicle to observe if the engine has excessive movement.

With a manual tranny, apply ebrake.
Good way break something. All you need to do is put it in park or neutral for the auto, or neutral for a manual. a little engine shake is normal. Personally, these are not that smooth when you gun it and mine will also lurch just a little after you let off the gas if you've been hard of the gas. do you have vibrations while driving? If so your motor mounts are on the way out for sure.
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Old 09-28-2009, 12:54 PM   #6 (permalink)
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I am very gentle with my cars and don't abuse them.

I did the test by applying the hand brake, put the manual tranny into the first gear and also the reverse, I give a bit gas and the engine physically moves up and down by less than one inch, is-that normal?

Other than the car jerking during acceleration if I suddendly release the gas pedal, the car has no vibration during driving or during idle.

That is strange because I don't remember it used to do that before. I also drive a 2009 corolla and the car does not jerk if I suddenly release the gas pedal during acceleration
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Old 09-28-2009, 05:49 PM   #7 (permalink)
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If you are going 60 or 70mph up a hill and then you release the gas while pressing the clutch at the same time, does it jerk. It sounds like normal stick driving with possible mount issues (front or rear).
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Old 09-29-2009, 07:51 AM   #8 (permalink)
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Originally Posted by kevmac View Post
If you are going 60 or 70mph up a hill and then you release the gas while pressing the clutch at the same time, does it jerk. It sounds like normal stick driving with possible mount issues (front or rear).
if I release the gas and press the clutch at the same time, the engine does not jerk at any speed

it only jerks if remained in gear
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Old 09-29-2009, 08:50 AM   #9 (permalink)
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My car generally jerks a little when changing gears, but the three-speeds were never smooth anyway and I've not driven the manual to say what it feels like in these. How old is the clutch in it, does it still engage smoothly?
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Old 09-29-2009, 09:10 AM   #10 (permalink)
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my clutch is original, my car has 200,000 km

the clutch does not seem to slip, this is the test I did to see if the clutch is slipping:

test 1: in 2nd gear, accelerate sharply to 6000 rpm: the car accelerate smoothly with a constant increase in speed proportional to the increase in RPM, no jerk nor slip

test 2: hand brake engaged, put the tranny in 3th gear, try to move the car, it stalls right away so the clutch does not slip

test3: from a dead stop, in 4th gear: tried to accelerate the car by releasing the clutch slowly, the car accelerate and catch up in speed with a bit of vibration but does not stall

test4: move the car up a steep incline from 1st gear: no problem at all

the above tests indicate the clutch is still good right?

Last edited by hungt1999; 09-29-2009 at 09:12 AM.
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Old 09-29-2009, 10:03 AM   #11 (permalink)
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Personally i think it needs a tune up. Also what is your definition of jerking? as in vibrates? Jerking is not because of motor mounts, its because of spark plugs and such goin bad. According to your scenerio, i doubt its even a tuneup thing cause it usually does that when you accelerate, not when you let go off the gas pedal but its worth gettin looked at.
It might even be a transmission issue, but im just guessin
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Old 09-29-2009, 10:05 AM   #12 (permalink)
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by jerking I mean: the car nose dip forward and the whole car shakes a coupe time before getting smooth
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