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Thread: 1996 deville 4.6 need help

  1. #1
    nmig17 is offline Cadillac Owners Member
    Automobile(s): 1996 deville
    Join Date
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    1996 deville 4.6 need help

    I hope someone can help me. Ive been trying to fix my moms car for the last couple of weeks now and ive come up with nothing. At first the car would get up to operating temp, fans would kick on like they should amd then it would just die. Then id have to wait for it to cool down before it start again. Since then I have changed both cps's, oil sending sensor, temp sensor on back of the head, crossover gaskets(that was due to me forgetting to plug the fans back in) , and finally the ignition switch. The only one that made any kind of difference was the ignition switch. At first it was idling better and would only die when put into gear. Within an hour i was driving it around. Now its kinda doing the same thing except instead of dying out right. The rpms drop really low and when I open the throttle it makes no difference and it jus falls out. I did change the fuel regulator too. I can hear the pump running even after it dies. Im getting zero codes. Not sure if it has to do with my display crapping out or not. Please any help I dont know what else to do.


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  3. #2
    CadillacLuke24's Avatar
    CadillacLuke24 is offline Cadillac Owners Master
    Automobile(s): Alexandra - 96 SDV --- Clyde - 15 Silverado
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    Re: 1996 deville 4.6 need help

    IF it's dying you have an ignition or fuel related problem. If the display is dying go to a local parts store and borrow their code reader.

    THe fuel pump may be on, but that doesn't guarantee it's on its way out the door. There should be a schraeder valve (like a bike tire) on the fuel rail, hook up a gauge and tell us what you get.

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
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    Re: 1996 deville 4.6 need help

    Start with a good TB cleaning (probably needs it anyway). If that doesn't help, check your fuel pressure.

  5. #4
    nmig17 is offline Cadillac Owners Member
    Automobile(s): 1996 deville
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    Re: 1996 deville 4.6 need help

    Ok heres my update. I think im more lost than I was before. So I borrowed my dads codereader and within a 24 hour period tye battery flat lined. Nothing was left on by me it just died. So needless to say my codes were erased. No big deal. I charged the battery up and this morning I finally was able to crank it up. It was running a little rough but after a min or two she smoothed on out. Then I noticed my display was working again. Dont know how but it was. So I let it warm up, fans kicked on, and everything seemed fine. I took it out for a spin. I went down the road about 1/4mile and came back. As I was turning in the diplay died out. But the car has yet to give me a problem. No check engine light. No hickups. Simply nothing. I drove it for about 20 mins in every which kinda way trying to get the problem to come out and it ran as smooth as could be. Im completely dumbfounded now.

  6. #5
    VEGASELDO91 is offline Cadillac Owners Fanatic
    Automobile(s): 1991 ELDORADO (R.I.P.); 1995 Sedan Deville
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    Re: 1996 deville 4.6 need help

    Have you done a complete charging system check?

  7. #6
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
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    Re: 1996 deville 4.6 need help

    Might also check the grounds.


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