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Old 03-11-2003, 10:20 AM   #32
Scooby Specialist
Member#: 5743
Join Date: Apr 2001
Chapter/Region: Tri-State
Location: nj/nyc
2007 Kia Optima
gold brick


thanks for the props!

it appears if the neutral switch is dead symptoms include 'bad idle'


Originally posted by quynce

I'll be the first to admit I know next to nothing about engines and the ECU's that controls them, but I do know that after I start my car in neutral, once I put it into gear, the RPM's drop. I suppose this is a response to the neutral indicator wire. If that circuit were fried, the ECU may not be able to manage RPM appropriately, and I doubt that would be a good thing.

Besides, it takes all of two minutes and 20 cents to wire a diode! I actually wired two, and fused it, for a little extra insurance. And netZ's suggestion to test it occasionally is a good one; I do it regularly.

On the other hand, if the diode opened completely, the neutral protection wouldn't be there anymore. That's fairly unlikely, though, and I'd rather protect the expensive ECU circuitry.

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