Join Date: Mar 2000
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Re: 302 with high idle????
If its the 5.0 the high idle is almost certainly related to the Throttle Position sensor (TPS).
You need to adust the TPS to as close to .99 VDC as possible. It can be a real pain in the a$$ to adjust.
I would recommend the use of a digital TPS monitor available through Interactive Systems & Technologies, in Canton Georgia, 800-820-1082.
Also an aftermarket adjustable fuel pressure regulator is a very good upgrade to help maintain very smooth low rpm throttle control.
The computer also needs a little bit of driving time (about 5 or 10 minutes) to establish operating paramters of the engine.
Bad O2 ensors can cause surging, but will also cause rich mixture conditions that can readily be smelled from the exhaust.
I would be willing to bet though that it is the TPS.
The exciter wire for my alternator (140 amp Lincoln Mark VII version), gets its control straight from the external voltage regulator.