1996 J30 transmission problems

[peaceman34]

I have a 1996 J30 with 151000 miles on it. I am having a problem when I get to about 40 mph to 60 mph when I let off the gas I feel a jerk in the transmission the same thing happens when I put my foot back on the gas. I am on schedule as far as maint. goes. Anybody have an idea? Thanks.

[elwesso]

Sounds like normal torque converter engagement......

[NY94J30]

when you say maintenance on sched., does that include regular transmission flushes?

Also, I would first use the search function, theres pelnty of information on this board. Secondly, I would put this thread in Infiniti online mechanic or infiniti general, not the general chat formum..

Edit... Wes is right, when cold, the torque converter engagement isnt all that smooth on the J.

[driverdriver]

I second the use of the serach function. There are numerous threads on this board with contributions by me and others talking about J30 transmission problems and issues. I think the topic has been exhausted to death.

[peaceman34]

I took the J 30 to a transmission expert and he thinks it's the torque converter clutch is locking up. This jerky shifting does not happen when the car is cold only after it is warmed up. He says I might need a rebuild!+

[Jesda]

That sounds accurate to me. And worn seals.

[driverdriver]

I would take the J to an Infiniti dealer for a second opinion. I took my J awhile back ago to an independent transmission shop, they told me I needed a rebuild. I took the J to my Infiniti dealer and they found out it was a sensor that needed to be replaced.

[peaceman34]

Thanks for the insight. I am having trouble with a knock sensor. The engine come on every now and then. It acually came on when the transmission mechanic was driving the car. Do you remember what sensor you replaced? I also get slow throttle response when I punch it when I am stopped. It takes a second or two then it accererates. Could this be timing or maybe a sensor? Thanks

[driverdriver]

I replaced the turbine/revolution sensor.

[metaverse3]

Thanks for the insight. I am having trouble with a knock sensor. The engine come on every now and then. It acually came on when the transmission mechanic was driving the car.

You already have an existing problem. Fix that first and then move on to the second issue. Everything in this car works in synchronicity. All sensors talk to the computer, and based on that, the computer talks back. If you have a bad sensor, it equals bad info, which in turn can equal bad feedback from the computer. I just resolved an issue with a knock sensor on a maxima where the sensor failed open.. it told the computer it was on, yet, it was giving no data. The result was poor driveability..and yes it can affect the drivetrain as well. Imagine an engine retarding when you are stepping on the gas and deciding to speed up expecting a gear change only to get a flat response while the transmission tries to make up it's mind. Fix the knock sensor issue first..that might resolve your transmission issue.

[peaceman34]

I tried to search for the location of the knock sensor on a 96 J30 but I didn't find out where it is. Could you tell where it is?