I recently bought a PS2 J Class that seems to have a chuffing sound issue. I'm running conventional with a Lionel LW transformer. When running at anything but a crawl, the chuffing sound becomes ridiculously rapid, sometimes cutting out altogether. It seems fine at slow speeds where the smoke puffs out, but when the speed is higher and the smoke fan goes into "always on" mode, the sound changes and sounds like a machine gun. A cursory inspection with the boiler off didn't show anything obviously out of place. The fly wheel and sensor seem to be in the correct position. Not sure what might be out of alignment to be causing this. Is the chuff interval determined by voltage or by actual wheel movement? The wheels don't seem to be moving fast enough to produced this rapid fire chuff sound.
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