Issue when taking off from standstill - jerking/lurching

[bung206]

Okay so I've inspected the live data stream, specifally engine speed, throttle position & fuel flow in CC/min.

When I step on the gas, the engine revs start to rise until they hit about 1200, then there is a sharp drop back down to 800 or so (while the car jerks, kind of like I dropped a gear and dumped the clutch in a M/T), after which point the car accelerates smoothly. During this time, I saw that the fuel flow rate and the throttle position do not change; they are on a constant upward curve (as one would expect).

Anyone got any more thoughts on what this may be?

[CTScott]

Originally Posted by bung206

Okay so I've inspected the live data stream, specifally engine speed, throttle position & fuel flow in CC/min.

When I step on the gas, the engine revs start to rise until they hit about 1200, then there is a sharp drop back down to 800 or so (while the car jerks, kind of like I dropped a gear and dumped the clutch in a M/T), after which point the car accelerates smoothly. During this time, I saw that the fuel flow rate and the throttle position do not change; they are on a constant upward curve (as one would expect).

Anyone got any more thoughts on what this may be?

It sounds like the torque converter in the transmission is not working properly.