Stop light surging, lurching??

What’s the miles on it?

 

The engine has a good bit of rotating mass, and the torque to start or stop it often comes through the transmission a little and rocks the car a bit.

The car makes heroic-ish efforts to keep that rocking to a minimum—if you're parked in a gen 3 with your foot off the brake, you can even hear the car apply the brakes for you an instant before it cranks or stops the engine, just to restrain the motion as much as it can. They also can use MG2 to apply a countertorque trying to hold the car still while MG1 cranks or stops the engine, and they try to pass very quickly through the low-RPM range where the engine resonates with the car body.

Still, despite all the efforts, you notice the lurch sometimes. Maybe we should just smile and remember how hard they worked to make it not worse.

 

If you had the animated-car display showing, did any arrows from the electric motor to the wheels appear and disappear while you were watching? If you have an OBD device that can show live data, were there any changes to MG2 torque while you were stopped?

The car is programmed to apply a small amount of MG2 torque while stopped, to create the same feeling as an auto-transmission car with the engine idling. To waste a little less electricity, it stops doing that if you are pressing the brake pedal hard enough, but it resumes the slight force if you let up a little on the pedal pressure.

if you're applying pedal pressure right around that threshold, you could notice the MG2 torque coming and going, and you would see same on an OBD scanner or the power-flow arrows on the dash.

(Note, both an OBD scan tool and the dash display get that information by sending repeated queries on the car's network and getting answers back, which means what you see on the display can lag a little bit behind what you feel happening.)

 

This is a good kit for reading data, viewing accumulated errors, and for configuring and testing systems.