Transmission mount and shifting

Tiny
AMIRMOUSAVI90
  • MEMBER
  • 2004 NISSAN ALTIMA
  • 2.5L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 147,000 MILES
Hello,
When I let off gas the rpm drops quickly to 1000 and jump to around 1200 and again drop back to 1000. Also the car jerks on acceleration and deceleration mainly from first to second or second to first. It looks the transmission has delayed shifting. My engine mounts were weak because when I was changing gear from P to R or N to R the engine used to jerk, I replaced the (except transmission mount), but now after a month I think the mounts are loose again and engine moves a lot. Do you think the jerky shifting might be caused by a weak or broken transmission mount? Or is it the solenoid or valve body issue? there is no light on. By the way, the jerky shifting is much more noticeable when I accelerate slowly, I do not feel a jerk if I push the gas pedal with high rpm and high acceleration.

https://www.youtube.com/watch?v=03Sl9RpDM78

Appreciate it if you can help me
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Friday, June 10th, 2016 AT 1:31 PM

6 Replies

Tiny
HMAC300
  • EXPERT
Check your transmission mount it may be the culprit if that does not work have a transmission professional look at it as it may be too much throttle pressure or something similar to that.
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Friday, June 10th, 2016 AT 3:39 PM
Tiny
KEN
  • ADMIN
Hey AMIRMOUSAVI90

It sounds like the mounts could be bad again especially if there are not OEM mounts, the cheap ones let go quickly. The shifting problem could be caused by the cat converter being plugged up, please use this link to check to see if your is working.

Also have you changed the spark plugs lately? This can cause engine problems that effect the transmission operation.

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

and

https://www.2carpros.com/articles/how-to-change-spark-plugs

One more thing, if you have a vacuum leak this too can give the engine and transmission problems,

go here

https://youtu.be/xN5pcM-5bso

Let me know what you find

Best, Ken

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Saturday, June 11th, 2016 AT 4:09 PM
Tiny
AMIRMOUSAVI90
  • MEMBER
Thank you so muck Ken, really appreciate it.
I checked eveything you said and everything looked normal.
I have a question. When I change gear from P to R, N to R or N to D, the engine jerk because of a weak engine mount, my question is that, does the cars engine jerk while shifting from 1 to 2 or 2 to 3 while driving the same way it does when changing from like N to R? Because I feel the same shake/jerk.

By the way, I think I have delayed jerky shifting after I changed my dead alternator. I don't think I had the problem before replacing the alternator. So could the replacement has caused any electronid problem?

Thank you so much
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Wednesday, June 15th, 2016 AT 11:31 AM
Tiny
HMAC300
  • EXPERT
If you had an electrical problem with a transmission scanning for codes would show it. I doubt it 's from a mount like you think. If anything it may be a sticky valve or a part wearing out or even fluid that is dark brown which would indicate a failure of a clutch seal or clutch plates. Check fluid if you can as most of the newer cars a mechanic has to do it if no dipstick
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Wednesday, June 15th, 2016 AT 12:07 PM
Tiny
AMIRMOUSAVI90
  • MEMBER
Thanks, I'll check the tranny fluid then.
By the way, I remember when I had dead alternator, I had to move the car back and forth for 1-2 meters to park my car since it was midnight, and I put much force and did it by hand force! ( I think the car was in N position and ignition switch was ON).
Could that damage my transmission that is jerky now?
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Wednesday, June 15th, 2016 AT 2:09 PM
Tiny
HMAC300
  • EXPERT
No, that would not cause a problem
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Wednesday, June 15th, 2016 AT 3:12 PM

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