Stalling problem 1992 4.9 Eldorado
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Cadillac Seville / Cadillac Eldorado Forum Discussion, Stalling problem 1992 4.9 Eldorado in Past Cadillac Vehicle Discussion; I have a intermittent stalling problem. Engine runs like a swiss watch for awhile, then all of a sudden engine ...
  1. #1
    Erics92eldo4.9 is offline Cadillac Owners Member
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    Stalling problem 1992 4.9 Eldorado

    I have a intermittent stalling problem. Engine runs like a swiss watch for awhile, then all of a sudden engine wants to kill.
    I can keep it running with RPM of 1700 or so. come to a stop sign, and have to put trans in nuetral with high RPM,
    to keep it running. when the engine is trying to stall, check engine light flickers or comes on. I have replaced the fuel filter,
    and checked vacum lines. any thought to my intermittent problem would be greatly appreciated.

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    drewsdeville's Avatar
    drewsdeville is offline Cadillac Owners Master
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    Re: Stalling problem 1992 4.9 Eldorado

    If the check engine light was on, a diagnostic code was stored in the computer. As a start, use the instructions in this link to retrieve and decipher them.

    http://www.cadillacforums.com/forums...x-engines.html

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    Ranger's Avatar
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    Re: Stalling problem 1992 4.9 Eldorado

    The ISC motor would be a suspect.

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    FoosShark is offline Cadillac Owners Member
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    Re: Stalling problem 1992 4.9 Eldorado

    How about this Eric?
    The Idle Speed Control should still be there and If I remember correctly it needs a Torx 30

    http://www.upullrparts.com/inventory
    Rosemount,mn

    ID Make Year Model Desc. Date Received
    UA5162 Cadillac 1992 Eldorado black 01/09/2014

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    drewsdeville's Avatar
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    Re: Stalling problem 1992 4.9 Eldorado

    Since the problem develops only after warm up (not under all conditions), and at least 1700rpm is needed to keep it from killing (just cracking the throttle as the ISC would doesn't work), I would think this is an engine management issue rather than a throttle angle/ISC issue...

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    Erics92eldo4.9 is offline Cadillac Owners Member
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    Re: Stalling problem 1992 4.9 Eldorado

    So this is what I have done so far. codes came up bad MAP. Replaced MAP. New cap, roter, wires & plugs. Replaced all vacum lines. Replaced fuel
    filter. Drove 250 miles from Minneapolis to Des Moine. Ran like a champ in bad weather conditions. Stoped in Des Moine for gas. Filled up, and decided to not brave the blizzard, and got a motel room. Engine now doing the same old thing. Does not want to idle. Engine surges up and down.I am on my way to south Texas. I am hoping the car will not have a problem running down the freeway at 2000 rpms tomorrow. I need suggestions? ISC?

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    amunderdog is offline Cadillac Owners Enthusiast
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    Re: Stalling problem 1992 4.9 Eldorado

    Quote Originally Posted by drewsdeville View Post
    If the check engine light was on, a diagnostic code was stored in the computer. As a start, use the instructions in this link to retrieve and decipher them.

    http://www.cadillacforums.com/forums...x-engines.html
    You need to to start here.

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    Erics92eldo4.9 is offline Cadillac Owners Member
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    Re: Stalling problem 1992 4.9 Eldorado

    Yes, got diagnostic code. came up bad MAP. replaced that along with the rest that I just said. Does not seem like it knows how to idle. gets caught in a funk that it wont come out of, till maybe the next day. ran like a champ down the freeway at 1700+ rpm's. soon as I stopped for gas, engine
    started surging.

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    lizzardman is offline Cadillac Owners Member
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    Re: Stalling problem 1992 4.9 Eldorado

    I have a 92 Seville also. The symptoms you are describing are the same as what I had. Mine would run fine and then suddenly just run bad and surge etc. After it cooled down it ran fine again. It would give codes that were only history. My problem turned out to be the PCM. Bought a used pcm with the right engine service code switched the prom over and have not had a problem since. the used pcm cost me 40.00 dollars.

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    Erics92eldo4.9 is offline Cadillac Owners Member
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    Re: Stalling problem 1992 4.9 Eldorado

    ok, car made it 1600 miles to Texas. now I replaced the PCM with a new one. still does not want to idle once it is warm. one can never know when it is going to just kill on you. wont hold a idle. I now have countless hours and almost $1000. trying to fix the problem. so here is the list... new MAP, NEW PCM, NEW plugs wires cap and rotor. New vacum hoses. I hope someone is still reading this and has a idea for me.

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    Re: Stalling problem 1992 4.9 Eldorado

    Quote Originally Posted by Erics92eldo4.9 View Post
    one can never know when it is going to just kill on you.
    This is ONLY at idle? Never stalls at cruise or WOT?

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    Erics92eldo4.9 is offline Cadillac Owners Member
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    Re: Stalling problem 1992 4.9 Eldorado

    only at idle. very frustrating. bumper to bumper traffic on the expressway, San Antonio. had to stop the car, put it in park, and then restart it. of course this car can not be started in nuetral. ISC? re learn the Idle again?

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    Dirty throttlebody maybe? Have seen this behavior with more recent gm vehicles when tb is coaled up... (including map code)

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    Re: Stalling problem 1992 4.9 Eldorado

    I don't think the '92 TB is as sensitive to dirt and carbon etc as the Northstar TBs are, It certainly wouldn't cause a stall because it uses the ISC motor as opposed to the IAC valve. I have to wonder if it's not an intermittent ISC motor. Is it original? Have you tried cleaning the contacts?

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    Re: Stalling problem 1992 4.9 Eldorado

    normally i wouldn't think of throttlebody either. but here's the full story to why i am: got in a gmc suv the other day, revving up and down at idle, eventually idling at like 450 rpm, then stalling. would stall for sure switching a/c either on or off. threw a map out of range code. had seen that before, so went ahead and changed it. seemed to get better for a minute or so, then again, revving up and down, stalling. no issues at all while driving. map code showed again. connected scan tool and had a look at live data. to idle at 700 rpm the throttle would be open like 25%, then out of nowhere it went to like 19%, 400 rpm, then up again, then stall at like 17%. i started thinking the pcm might be bad. then it ocurred to me that this thing just might be getting out of range while trying to hold an idle, for some reason. i had a look at the tb, and found quite a layer of carbon residue. cleaned that off with a rag and carb cleaner. started her up, nice and smooth idle at 700 rpm. looked at live data again, 16 to 18% at 700 rpm, what a difference! could switch a/c on and off now, no hesitation or stalling, no map code.

    ok, i'm talking a 2004 vehicle here, with epc (electronic throttle). but that's exactly why i could imagine that being the problem. isc is quite similar to epc when it comes to idle regulation, a motor moving the throttle, as opposed to iac, a motor (or pulse valve) opening and closing a bypass. now i could make a trip to imaginary land and think that the way the epc idle sequence is programmed into nowadays pcm's is the same way the isc sequence was programmed 20 years earlier, in a faulty and not diagnostic friendly way, but that would be too much, wouldn't it...

    i might be totally off here or as well getting somewhere, it's just that the op's problem sounds so much like this experience... i'd say it isn't expensive at all to give that tb a good cleanup, and it won't hurt a thing

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