Reply to "Engine lunges with each chuff when smoke is on"

GGGOGR Forum Member

Nope. A disconnected smoke unit should not stop chuffing. I believe you have a broken wire to the tach unit, probably the ground line. When the fan gets pulse it feeds back enough voltage to the tach to get a signal to generate a chuff since they share the 5V line.

Replace the tether. BC-0000217 since this is an easy fix with the detachable external tether.

If that fan does not run it may be bad also so replace it too. BUT Does the motor spin when power applied (disconnected from board) May just be a loose impeller on the shaft. Dot of superglue will fix that. BE-0000041 is fan motor. G

11/8/178:17 AM

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