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IAC doesn't have a ground, its a 4-wire stepper motor. FSM shows the TPS ground comes from the engine computer "sensor ground" on pin D3. Some folks have spliced in a ground at the TPS to the intake manifold. There is a ground at the dipstick tube that I recall connected to the ground on a whole bunch of stuff as well.
yeah, like 4 wires come into one, i had constant idle probs after a motor swap and found a broken wire there. after supplying a new tps ground, it was a battle
The FSM doesn't show it, but I think they may get grounded there as well. I do recall a handful of black ground wires that are crimped and wrapped in duct tape in the wiring harness near there.
bcmaxx - for your viewing pleasure, I present: Erratic idling
lawsoncl - there are a handful of grounding wires along with the Batt Neg cable that ground to a stud there. I'll double check the integrity of the grounding at the D3 pin. I've been through that shake and dance once already on the XJ.