Choke?
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HT4100 4.1, 4.5, 4.9 Discussion, Choke? in Cadillac Engine Technical Discussion; Up here in the Northeast the very cold weather has arrived. Going out to start the Caddy (93 Deville 4.9) ...
  1. #1
    zentrade is offline Cadillac Owners Fanatic
    Automobile(s): Cadillac 1993 Deville 4.9, 1991 Eldorado Touring Coupe
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    Choke?

    Up here in the Northeast the very cold weather has arrived. Going out to start the Caddy (93 Deville 4.9) after its been sitting all night or a day is a tad difficult as the car stumbles and its idle "lopes" in the first minute of running while the accelerator pedal pumps on its own rapidly in short "blips" .

    The 4.9 cranks over ok but i have to help it out to stay running or it appears it will stall if left on its own,Mostly will not but has once.

    After a minute she is ok. If i have not run the car long and made a short trip, Upon shutoff ,The accelerator pedal "blips" again rapidly for about 10 seconds while car is off.

    Is this the choke? anything else? I replaced the ISC this summer. Did install a used one but not sure this is the problem, All this developed just when the temperature dropped in last 2 weeks.

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  3. #2
    awadecki is offline Cadillac Owners Enthusiast
    Automobile(s): 76 Eldo (54k), 76 Eldo (52k), 78 Eldo (9k), 85 Deville (43k)
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    Re: Choke?

    There is not a choke on these vehicles. That went out with the carburetor. However, if your ISC is working properly, then your EGR may be sticking open (push up on the diaphram when the motor is cold--it should move freely with some resistance), or your PCV may be stuck.

    The pedal moving around after shutting the car off is normal.

  4. #3
    cadillac_al is offline Cadillac Owners Connoisseur
    Automobile(s): Cadillac 78 Seville, 78 Coupe de Ville, 92 Sedan de Ville
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    Re: Choke?

    Have you disconnected the battery lately? Did you go through the idle re-learn process outlined in the owners manual? Have you cleaned the throttle body and EGR tubes lately? If so then you can skip the idle re-learn. I hope you don't have water in your gas, that has caused some problems around here lately. I'm just throwing some thoughts out there. My 92 Deville has original plug wires and very old spark plugs that are getting changed this week, but the car still starts and runs beautiful in this below 0 weather in the northeast. Good luck getting yours sorted out and keep us posted if you fix it.

  5. #4
    zentrade is offline Cadillac Owners Fanatic
    Automobile(s): Cadillac 1993 Deville 4.9, 1991 Eldorado Touring Coupe
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    Re: Choke?

    Thanks guys ! I`ll check on the EGR valve today. I disconnected the battery about two months ago.....No problems until this cold snap. Throttle body and EGR tubes cleaned this summer. Perhaps a re do needed. The pedal "blip" on its own while trying to warm up makes me think its something other but i`ll check EGR and clean out tubes etc....will report back.

  6. #5
    zentrade is offline Cadillac Owners Fanatic
    Automobile(s): Cadillac 1993 Deville 4.9, 1991 Eldorado Touring Coupe
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    Re: Choke?

    Also.....The accelerator pedal never moved on its own before. I know the ISC does in the engine compartment but i mean the accelerator pedal in the car interior moves on its own now. Never did that before in the year i have owned the car until this situation

  7. #6
    awadecki is offline Cadillac Owners Enthusiast
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    Re: Choke?

    It's normal for the pedal to move while the ISC resets when you shut the key off. I wouldn't worry about it. The pedal has to move if the throttle is moved by the ISC--it's connected by a cable. The pedal may be moving more now to compensate for something that's throwing the car's idle of when it is running.

  8. #7
    zentrade is offline Cadillac Owners Fanatic
    Automobile(s): Cadillac 1993 Deville 4.9, 1991 Eldorado Touring Coupe
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    Re: Choke?

    I see.Thanks!

  9. #8
    peteski is offline Cadillac Owners Enthusiast
    Automobile(s): 85 Eldo Biarritz
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    Re: Choke?

    Any codes set?

    Peteski

  10. #9
    Po Pimp is offline Cadillac Owners Fanatic
    Automobile(s): 92' Eldorado, 97 Catera
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    Re: Choke?

    Could be a slight vacuum leak.

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