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Posted by DanNY (91SE) on July 05, 2002 at 11:31:55:
In Reply to: Exactly, no wonder they call them idiot lights posted by MIKE on July 05, 2002 at 10:51:30:
: Ok I understand it just provides a ground, but I would think it should have a pressure rating. It's not light a fluid level sensor, like the ones that might be in a radiator and if the water drops below that sensor it will trigger a light. Since the switch is in the oil pressure flow it has to has a pressure rating. Maybe the minimum pressure rating is so low, all the oil will be gone before the light comes on just as you stated. : If someone is aware they have a minor/moderate oil leak they will check their oil level more frequent, BUT if for some reason you're cruising around and all of a sudden you have a moderate to severe oil and it's day time you may driver several miles before noticing anything, that sucks. : If we can have this light turn on at 20-25psi instead of 0psi I don't have to say how benificial that will be.
it's not like a fluid level sensor..but it's stuck in a oil passage (to/away from filter). so the oil has to travel the passage and to the sensor (some psi behind it)..if psi drops i would assume the oil will stop traveling to the hole in the sensor and then it'll light up...but how much psi loss is that? no clue.