Another Conversion

[53 Catalina 292]

Great, thanks - but enough about me. Or "Moi", as Miss Piggy puts it. Do you have a wiring diagram for the donor 91 Astro, to help you answer your wiring questions? (I'm thinking about your inquiry about anyone having pictures of their wiring installation on a 250.) No responses to that request, yet? I'm wondering if there is enough similarity between the harnesses of your 91 Astro donor and my 89 Caprice donor to be of any use. Manufacturers have been known to goof up and do things the same way for a couple of years.

[r.e.c.enthusiasts]

I do not have a book per say. but I do have the downloaded wiring diagrams for the 91 Chev Astro 4.3l auto. I do not know if the oil press switch is looking for the same pressure as what my l6 original pump puts out.
Also the prom is Delco AUMJ 1278 underneath it has
JT8(G)/J6/P
LFIVN960
AE03

[53 Catalina 292]

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?

[ony]

it depends on what oil I use ,my 4.3 has 20-35 psi at idle .

[53 Catalina 292]

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?

[r.e.c.enthusiasts]

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

[r.e.c.enthusiasts]

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?

Nope. Just came w dummy light

[ony]

I have a electric dash gauge [stock] . them sender units may operate at different psi I don't no.