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mark houghton mark houghton is offline
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Join Date: Jul 2008
Location: Central Washington State
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[QUOTE=wholio94112;7406355...so with the overboost sensor switch hooked up to the brown wire, how'd the car run if its not supposed to???[/QUOTE]

That's a good question. Both wires...the white one to the overboosdt switch and the brown one to the boost sender are pathways to ground. The OB switch provides the ground needed for the airflow sensor charging pressure relay (the yellow one) to activate, which in turn activates the two fuel pump relays. The brown boost sensor wire also provides ground for the gauge..that ground eventually running through the sensor's internal variable resistor and then to ground via the body of the sensor attached to your IC.

I could see where everything but the gauge would work correctly even if you had the location of the wires reversed, but only if your boost sensor was itself well grounded....which in you case it seems not to be. Hmmm....
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 04-25-2013, 07:38 AM
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