Thanks for the information - that's a lot to put on a small part. I think oil pressure should be about the same for the 250 and the 4.3. So oil light on at idle causes can be, besides actual low oil pressure from engine wear - oil pressure not getting to switch, due to passage obstruction, switch failure, oil too thin from gas dilution, and idle speed too low. Any of those possible? Does the light go out as engine speed increases? Are the valves noisy?
it depends on what oil I use ,my 4.3 has 20-35 psi at idle .
Sounds healthy. I'm told that the pressure switches for dash lights turn the lights on below 7 p.s.i. Does yours have the factory gauge setup?
Well. The old sensor came on when oil got too low (valve cover leak I have not been able to seal yet. Prolly going to replace the cover.) I do not know if this sensor is any good so I'll probably replace it. My engine w/o fan is really quiet compared to when my dad had it running. Haha
Although thinking about it the oil pressure switch that I pulled from the Chevy Astro van appeared to have a piece of plastic tube snapped off inside of it I might go pick another one up for $20
Last edited by r.e.c.enthusiasts; 08-16-2017 at 06:12 PM.
Nope. Just came w dummy lightOriginally Posted by 53 Catalina 292
I have a electric dash gauge [stock] . them sender units may operate at different psi I don't no.
r.e.c.enthusiasts - Maybe, instead of spending $20. on a new oil pressure switch, you could try walking into the parts store with a straight face and asking if you could just borrow one for a couple of hours. Sometimes the guys like to kid around. Good luck with that. My mental image of the engine end of the perfect oil pressure switch doesn't have any snapped off plastic tube, so you may be on to something. I've had a few of those "Oh, yeah, now that I think of it..." moments. Sometimes I say, "I knew that! I did!" Is the oil pressure gauge involved in the TBI or ignition wiring? Just thinking that if you had a mind to put a gauge in someday, and it's not wired into the TBI or ignition controls, this could be a good time. I know one Chevy system in a previous century would cut power to the fuel pump if the oil pressure was inadequate. Three terminals on those switches, I think. How many on the Astro switch?
it depends on what year and model if it is hooked to the fuel system.i think you can bypass all that if you no how.
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