MSefi.com read only forum (Jan.15,2018)

Got a V3.0 MSII with 2.905, relay board, MSD6a, mopar. I've been trying to track down some issues with the set up since I got it running back in August. Looking over some logs I noticed there seemed to be a lot of noise coming through the tps signal, when I know my foot was steady. Looked at the TPSdot and there are semi periodic jumps up to ~10% throttle. This happens though to a somewhat lesser degree even with the engine not running and the key only in the run position. Disconnect the tps wire bundle, it stops. Disconnected msd ignition box, no change. Disconnected the tps signal wire from my relay board and it stops. Hooked up tmy pocket scope to the disconnected signal wire and the reference terminal (still connected) and I see a 4ms noise signal. Checked the tps return against the ground terminal and it is pretty steady except for a 0.02V square wave variation with a many second long period(i never checked, but it was over 10 seconds)

Any ideas?
Thanks.

Is the TPS grounded to the MS?

Where is the MS grounded?

The TPS has 3 wires, reference, signal and return, they all go back to the relay board positions 12,13,14. The MS is grounded to the common ground for the whole system on the engine block.