Hi all, I know there are some smart VQ37VHR-RE7R01A, 3.7L-7AT GEAR HEADS on this forum who have the power and knowledge to help me.

what is wrong with my car!!!??? Analyze my footage and give me concise judgments as to what you think is causing this. Same drivetrain as all of you, no different.

Replaced: Mass airflow sensor(s), Throttle bodie(s), valve body assembly of the transmission (only), ATF Fluid, crankshaft position sensor.

Verified: no vacuum leaks whatsoever. Problem presence was verified during operation of vehicle under both a tuned ECM and a stock ECM for over ten thousand miles of driving each.

Mods: stillen gen ii intakes w/ k&n oiled filters, ark performance 2.5" dualflow CBE.

Footage: youtube.
Subsequent edit: you are supposed to monitor the fuel economy mpg bar on the middle screen in order to interpret when the pedal is being pressed or not.

There is absolutely no possible way you can watch the video without observing egregious RPM plummets to RPMs that are NEVER permissible at road cruising MPH speeds. If you claim you don't see anything, you clearly aren't knowledgeable about engines in general. There is no way you can say to me with a straight face that plummets down to 500 or 600 RPMs in such a dramatically fast motion DURING 40-55 MPH. You are b*llsh*tting yourself if you do, please do not be those people both IRL and on the internet who have tried to claim that I am imagining things or over-analyzing the engine's natural tendency to dip ...... (LIKE THAT!?)...., when the symptom is so clearly in your face that it's undeniable.

When you release the gas pedal at road speeds, the RPMs are supposed to smoothly descend to 1450-1550. in my case, it will fall below that threshold (obviously) and then BOUNCE or BOB back up to normal. From there, it will continue to fluctuate very erratically up and down by an increment of 150 RPM because there is no stability in the engine's RPMs during the absence of throttle. SO YOU TELL ME! what's wrong? What is responsible for ensuring and sustaining a steady descending of the RPMs to 1500 while coasting with no throttle????????? If you can determine what that part is, you may hold the cure for my Q50. after three years


And here are the only two videos on youtube where the same exact problem can be observed. Oddly enough, yet not surprising to me, the comments are only consistent with people asking if there was ever a solution found and that they too suffer from the problem with no avail. No answers found anywhere.

 

Without audio, I can't make any sense of the video as I can't hear the engine.
I have no idea when you are on the gas or off.

I assume you have successfully completed the idle air volume learning.

The only thing that comes to my mind is that your torque converter is not locking up, which allows the engine to return to idle.

 

the volume was cut due to unnecessary commentary (i believe). the way you can tell when i am pressing gas or not is by the fuel economy guage in the middle. It fills to max when released. Then lowers to 20mpg when pressed. The fuel economy guage is the answer to your inquiry and also the way that the viewer was initially intended to interpret the video.

Idle relearn has been performed tons of times.

If you would go into further detail about how a torque converter works and how it might pertain to this problem, I'd really appreciate it. As far as I am aware, across these roughly three years that I have been asking the internet for answers, the only box that has not been checked or even looked at is the torque converter. Back when I had the roughly $5,000 job done to replace the transmission valve body, especially after having been informed several times that it could have something to do with shift solenoids, I put the possibility to a rest in terms of the transmission but obviously the torque converter is worth a second deeper look. So please, go on..!

 

Since my G has a manual transmission, I don't have any first hand information on what is the typical operation. Hopefully someone else can chime in.