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Thread: Oil pressure specs for 4.1 at idle

  1. #16
    tallpat's Avatar
    tallpat is offline Cadillac Owners Fanatic
    Automobile(s): 1986 Coupe Deville
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    Re: Oil pressure specs for 4.1 at idle

    Yes I did not pay for that advice however he is an excellent mechanic and a value his opinion, and he knows i do some of the work on this car myself as long as it makes sense. I will check the oil pressure with a gauage when i get the new switch. it feels like the idle speed maybe causing this. I am a DYI guy but i'm not a master ASE mechanic. I will let you know the numbers next week. thanks for all your replies you all have been helpful.


  2. #17
    tallpat's Avatar
    tallpat is offline Cadillac Owners Fanatic
    Automobile(s): 1986 Coupe Deville
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    Re: Oil pressure specs for 4.1 at idle

    Hi everyone . I was able to get out this am and check oil pressure. here is what I got. Cold start oil prssure 45 ibs, warmed up in neutral 16 lbs and the same in park at idle. so now I know its the switch. Problem getting the correct one. the one I just purchased has a 3/8 thread not 1/4. any suggestions where to get the right part.

    thanks again eveyone for your help!

  3. #18
    dennis93coupe's Avatar
    dennis93coupe is offline Cadillac Owners Connoisseur
    Automobile(s): 1993 Coupe Deville, 2009 XLR-V 1 of 6 Crystal Red
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    Re: Oil pressure specs for 4.1 at idle

    I am sure you posted earlier, where did you get the last one?

  4. #19
    tallpat's Avatar
    tallpat is offline Cadillac Owners Fanatic
    Automobile(s): 1986 Coupe Deville
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    Re: Oil pressure specs for 4.1 at idle

    Rock auto but i found one from a gm dealer hopefully nos i will let you know

  5. #20
    aeronca36606 is offline Cadillac Owners Enthusiast
    Automobile(s): 85 Coupe Deville 4.1 V8 & 4.3 V6 Deisel & 1970 Eldorado
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    Re: Oil pressure specs for 4.1 at idle

    You need to get the engine HOT by going out and driving it hard to get an accurate hot oil pressure reading. Letting it warm up in idle is not sufficient. The oil will not heat up as much as if it is driven. Good luck and go with the oem switch whenever possible.

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