Swap Startup: Stumbling

[cebra]

Originally Posted by skyphix

There should be several PID's for the Throttle Position sensor, so any OBDII reader and software should be able to identify them. I am most familiar with Torque/Torque Pro but I believe thats Android only.

Once you can find the TPS gauges it should illuminate some. I didnt see mentioned; are you drive by wire or drive by cable?

Cable, the only one I can find is "Absolute Throttle Position" but it only tells you how far open the TPS is which isn't very useful.

[skyphix]

Originally Posted by cebra

Cable, the only one I can find is "Absolute Throttle Position" but it only tells you how far open the TPS is which isn't very useful.

So, that actually is useful. What are your readings at idle and with the pedal floored?

With DBC at idle your TPS should show "0%" since you have an IAC to keep airflow correct. With DBW's the TPS won't or shouldn't show 0% at idle because it does NOT have an IAC and the TPS+throttle actuation motor is what keeps the blades open the appropriate amount. If, for some reason, your TPS is showing > 0% at idle then off idle stumble would be expected because it would push more fuel than is needed.

Does that app have calculated AFR or Commanded AFR? With narrowband O2 sensors the most accurate you will get is "rich" or "lean" - the actual numbers don't matter but it might help illuminate some of the problem.


I also noticed that you're running a manual trans. Did BP flash it with a non-electronic trans tune? Occasionally that can cause weirdness, especially on deceleration . Your issue sounds different, but its a thought.