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flightlead404 flightlead404 is offline
Join Date: May 2015
Location: Secret lair deep underground
Posts: 1,529
Originally Posted by 16Volt View Post
My car is an 86 and uses the yellow relay for reference.
Mine also.

I'm using the delayed action feature to drive the microsquirt because I discovered that the power momentarily shuts off between "crank" and "run" key positions.

This occurs for all devices on the +12v including WUR, fuel pumps etc.

People have surmised that this delayed action was to somehow depressurize fuel lines, or ensure there was no unburnt fuel in cylinders, or other things. I always questioned that, I don't know of any other car that does it, certainly none I've owned.

Now playing with the MS has led me to think that possibly the reason is to ensure power is maintained to the CDI unit during the transition from crank to run.
Old 01-04-2017, 12:48 PM
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