Carburetor adjustments
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500, 472, 425, 368 Discussion, Carburetor adjustments in Cadillac Engine Technical Discussion; Have heard removing condenser coil will help with cooling. Looking to increase air flow to carb. but can't find any ...
  1. #1
    cady75 is offline Cadillac Owners Member
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    Carburetor adjustments

    Have heard removing condenser coil will help with cooling. Looking to increase air flow to carb. but can't find any spacers or col air intakes that will fit 75' Eldorado. Recently took out old cat and put in new high flow. Probably should have not put one in at all I guess. Any ideas on increased air flow. Also any tips on why I can't keep cold Caddy from stalling at idle until warm. after 5-6 minutes I can engage transmission without stalling. Vacuum problem? . I know that's a bunch of questions. Thanks

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    davesdeville's Avatar
    davesdeville is offline Banned
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    Re: Carburetor adjustments

    The cold stalling is a choke problem. You'll need to adjust or fix it depending on what's wrong.

    Using a spacer under the carb will help a bit, I'm sure they're out there. Just search for spreadbore carb spacer. As for an intake, I personally think the stock cool air intake air cleaner assembly is fine. Other options would be an open element air cleaner, or my favorite would be a dual snorkel air cleaner inhaling cold air from each side.

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    JTraik is offline Cadillac Owners Enthusiast
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    Re: Carburetor adjustments

    Many overlook the exhaust manifold heat riser, and those who do see it think its useless. If your heat riser is stuck and not working that could be part of your cold related problems. It makes priority out of warming the carb up when the engine is cold by stopping up exhaust and when the engine warms up it opens and allows the exhaust to flow normally. Not only does the heat riser do that but it also is needed to provide equal exhaust pressure on both sides. Just somethin to look at...

  5. #4
    cady75 is offline Cadillac Owners Member
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    Re: Carburetor adjustments

    Sounds like you're describing the valve on the exhaust manifold that bypasses back into intake on start up? To check operation can I just check tube that reroutes exhaust into intake. It should get real hot real quick, right. Also manual says you can lube this part, is this true. Is this part repairable or just replace it? One last question, I usually have to start the car 3-4 times to keep running. will this riser valve help this instantly? thanks, pretty cold up here 22 degrees. springs coming I think.

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    Aaron J Williams's Avatar
    Aaron J Williams is offline Cadillac Owners Member
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    Re: Carburetor adjustments

    The heat riser will help but most likely the choke needs adjustment or repair. Does the car idle high when cold? If not,then the choke isn't setting.

  7. #6
    zonie77 is offline Cadillac Owners Connoisseur
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    Re: Carburetor adjustments

    One reason for not idling until the engine warms up is bad valves. Just a possibility.

  8. #7
    JTraik is offline Cadillac Owners Enthusiast
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    Re: Carburetor adjustments

    Quote Originally Posted by JTraik
    If your heat riser is stuck and not working that could be part of your cold related problems.
    I tried to word that as carefully as possible heh. As Aaron stated, it will certainly help but your choke looks like it needs some repair.

    As for the heat riser, there is no tube, but rather the exhaust is backed up and forced through a "ribbed passage" in the intake. The exhaust heats up the carb quicker in the cold and then heat will cause the heat riser spring to expand and open the valve.

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