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Discussion Starter #1
I've posted about this before, but I figured I'd revisit the issue to see if anyone has not only had a similar issue, but also found an actual solution. The problem is that this may only happen once every two weeks or so (though when it does happen, it often occurs a couple times within a few minutes), so it is almost a certainty that if I just take it to the dealer to have them check it out, they won't be able to duplicate the issue.

Usually, when it does happen, it's after I'm decelerating, such as approaching a red light, then very lightly tap the gas to gently accelerate if the light turns green before I get to it. I'll get this jerk that either feels like the transmission is abruptly trying to choose an incorrect ratio, or that the lock-up torque converter is briefly engaging when it is not supposed to. I even felt something similar when completely stopped at a light a few days ago. I had been stopped for several seconds, and I felt a light jerking in the car. Maybe it was something like the engine cooling fan kicking on (the A/C was NOT on), but I had never noticed anything like that when the car was completely stopped before.

In any case, it's not like a really harsh jerk that feels like the car is coming apart, but it definitely feels like something is going on that shouldn't be. I really don't think it's the transmission itself -- my guess would be the throttle position sensor or a speed sensor. There are NO warning lights on, but I had something very similar happen with my last car -- a 2002 Ford Escort ZX2 -- and it was, indeed, a speed sensor, and it also had no warning lights on at the time, either. But maybe it's something different, which is why I'm asking here. It's not a major issue, but I'm concerned that it could eventually damage the transmission.

It would be really helpful in a situation like this if the dealer could rent out a data logger that would be plugged into the OBD-II port for a couple weeks. This logger would have a button that I could push anytime I experience the issue, so that when brought back to the dealership, the mechanic could examine the recorded OBD-II data at the time I noticed the issue to see if any sensors are producing wacky output.

I just figure that, if I can get some good ideas on this, I can have my dealer check those suggestions out the next time I bring the car in for an oil change, as I do have a comprehensive extended warranty on the car.

Thanks for any help.
 

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Discussion Starter #3
About 71,000 miles, but it has been doing this since I got the car, which I bought used at about 54,000 miles. Again, it doesn't happen often, but I would like to zero in on what it is. I had the CVT fluid changed shortly after I bought the car.
 

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I agree, some better diagnostics provided by the dealer would help.
Did you happen to note the RPMs (roughly) when the anomaly occurs?
That may be helpful in duplicating it.

On side note, nice mods on your car. We have the same year and color. Mine is a 4 door sedan though.
 

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Discussion Starter #5
Thanks! My current projects will hopefully be done within a month. As for the RPM's, well, it's always under very light throttle, after my foot has been off the gas when coasting. So, I would guess about 800-1000 RPM. I can do the same action a dozen times and nothing will happen, then it will occur suddenly out of the blue. It doesn't seem to be getting any worse or better -- just random every week or two. But, when it does happen, it does seem more likely to happen again within a few minutes, but then it might not happen for days or weeks.
 
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