@H1000 posted:I've had a couple of PS3 steamers do this. It's a problem with the tender connection at the wireless drawbar. My missed chuffs were mostly occurring when rounding a curve. One I fixed it by opening the tender and swapping the 6 pin wire connector from the tender board to the post connector where the drawbar connects. I cut the zip tie on that wire connection and left it off to give the swivel on the tender a little more free motion. Another had a bad solder on the wireless drawbar.
Everything else worked great on these two engines except missing the occasional chuff sound (when the chuff missed the smoke unit also didn't puff).
We saw this occasionally at MTH. Repeated connecting/disconnecting of the drawbar enlarges connections inside the 6-pin harness. Swapping end for end sometimes fixes it because the harness connection in the board doesn’t move. I used to disassemble the harness wire by wire and tighten the “clamp” that grips the pins on the drawbar.
