EFI to Carb swap ? - 1976 Eldorado
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500, 472, 425, 368 Discussion, EFI to Carb swap ? - 1976 Eldorado in Cadillac Engine Technical Discussion; I have a 1976 Eldordo with factory EFI. Am curious to know what the expert opinions may be on if ...
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    davidp1561 is offline Cadillac Owners Member
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    EFI to Carb swap ? - 1976 Eldorado

    I have a 1976 Eldordo with factory EFI. Am curious to know what the expert opinions may be on if the EFI should be swapped for a carburator? How reliable are the old EFI's and how available are EFI parts etc?

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    Submariner409's Avatar
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    Re: EFI to Carb swap ? - 1976 Eldorado

    Hang tight - which engine are we talking about ??? (500, 472, 425 ???) If you get no answers here we can move this to the Engines forums.

    Welcome Aboard !!!

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    davidp1561 is offline Cadillac Owners Member
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    Re: EFI to Carb swap ? - 1976 Eldorado

    Thanks for the welcome am looking forward to being part of the fun. The engine is the 500 cid................

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    basscatt's Avatar
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    Re: EFI to Carb swap ? - 1976 Eldorado

    Quote Originally Posted by davidp1561 View Post
    I have a 1976 Eldordo with factory EFI. Am curious to know what the expert opinions may be on if the EFI should be swapped for a carburator? How reliable are the old EFI's and how available are EFI parts etc?
    --------------------------
    if the EFI should be swapped for a carburator
    the original EFI system was SO bad - they made a carb-swap kit -
    and the vast majority did the swap -

    if you LOVE to tinker - and REALLY ENJOY being frustrated -
    stay with the EFI -

    if - on the other hand - you would rather go for a nice - relaxing cruise -
    put the carb on it -

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    Submariner409's Avatar
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    Re: EFI to Carb swap ? - 1976 Eldorado

    OK - The general trend here in Seville/Eldorado is the Northstar engine. Let me move this to Engines, 500 etc., and see what happens.

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    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: EFI to Carb swap ? - 1976 Eldorado

    Quote Originally Posted by basscatt View Post
    --------------------------
    if the EFI should be swapped for a carburator
    the original EFI system was SO bad - they made a carb-swap kit -
    and the vast majority did the swap -

    if you LOVE to tinker - and REALLY ENJOY being frustrated -
    stay with the EFI -

    if - on the other hand - you would rather go for a nice - relaxing cruise -
    put the carb on it -
    That's been my experience too. If the FI worked, I would run it as long as it worked good. Replacement parts are hard to come by though. I don't think I would trust it for a cross country trip either.

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    The Ape Man's Avatar
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    Re: EFI to Carb swap ? - 1976 Eldorado

    My opinion is the carb cars never even came close to running as well as the injected Cadillac 500 or 425. They do take knowledge to keep running though.

    I would sooner switch to a more modern injection like a Megasquirt than put a toilet bowl on top of the intake manifold.

    If you are anywhere near Toms River NJ I'd be glad to take all those awful injection parts off your hands in exchange for installing the carby/intake/misc stuff.

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    drmenard is offline Cadillac Owners Enthusiast
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    Re: EFI to Carb swap ? - 1976 Eldorado

    The main problem with those old computers are they are old.. They say the parts are hard to come by, but I have a bunch of them.. There is a member of this board , Bruce Roe, that fixes the computers and some mods to keep them running with less problems... If I had your car I would just keep some spare parts on hand, like a spare computer and a few temp sensors.. I would take out the low pressure fuel pump in the tank and put in a high pressure pump.. That way you can take off the high pressure on the frame and just use one pump... And do Bruce's extra relay mod to run the pump to help save the computer...The only part that is hard to find is the fast idle heater valve... I had a lot of them , but there all gone now...

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    Re: EFI to Carb swap ? - 1976 Eldorado

    Quote Originally Posted by drmenard View Post
    The main problem with those old computers are they are old.. They say the parts are hard to come by, but I have a bunch of them.. There is a member of this board , Bruce Roe, that fixes the computers and some mods to keep them running with less problems... If I had your car I would just keep some spare parts on hand, like a spare computer and a few temp sensors.. I would take out the low pressure fuel pump in the tank and put in a high pressure pump.. That way you can take off the high pressure on the frame and just use one pump... And do Bruce's extra relay mod to run the pump to help save the computer...The only part that is hard to find is the fast idle heater valve... I had a lot of them , but there all gone now...
    Good info. The 500 C.I. fuel computer is not as easy as the 350 or 425 to come by in my experience. Agree on the pump. The other liability is the fuel lines.

    I'm fairly sure someone could adapt an external fast idle valve like some of the Euro Bosch EFI cars of the era used. Probably been done already.

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    drmenard is offline Cadillac Owners Enthusiast
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    Re: EFI to Carb swap ? - 1976 Eldorado

    Apeman... I have a used 500 computer that has been gone over by Bruce that looks the day it was made... Somebody will need it one of these days... I have a fuel injection set-up on a 472 run by a haltech... I made a fast idle replacement set-up... It is a solenoid valve that is closed by a timer circuit board and the haltech at a temp.. It closes when it reaches 150 F or if it is already warm it fast idles for 60 seconds...

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    Re: EFI to Carb swap ? - 1976 Eldorado

    Quote Originally Posted by drmenard View Post
    Apeman... I have a used 500 computer that has been gone over by Bruce that looks the day it was made... Somebody will need it one of these days... I have a fuel injection set-up on a 472 run by a haltech... I made a fast idle replacement set-up... It is a solenoid valve that is closed by a timer circuit board and the haltech at a temp.. It closes when it reaches 150 F or if it is already warm it fast idles for 60 seconds...
    Farout. Any details of pix of the Haltech?

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    Re: EFI to Carb swap ? - 1976 Eldorado

    I will be taken it out of storage sometime real soon for the summer.. The first week of april is pretty safe no more snow.. I'll take some pictures and post them then...

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    Re: EFI to Carb swap ? - 1976 Eldorado

    Quote Originally Posted by drmenard View Post
    I will be taken it out of storage sometime real soon for the summer.. The first week of april is pretty safe no more snow.. I'll take some pictures and post them then...
    OK. I have to shoot some pictures for this site myself. Have to move the rocket launcher parts out of the way first.

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    Re: EFI to Carb swap ? - 1976 Eldorado

    Quote Originally Posted by The Ape Man View Post
    My opinion is the carb cars never even came close to running as well as the injected Cadillac 500 or 425. They do take knowledge to keep running though.
    I agree! I had a '76 EFI Fleetwood and it was the smoothest running Cadillac I've ever owned.

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    Re: EFI to Carb swap ? - 1976 Eldorado

    Quote Originally Posted by caddydaddy View Post
    I agree! I had a '76 EFI Fleetwood and it was the smoothest running Cadillac I've ever owned.
    Especially at or just above idle. The uphill intake manifold on these engines may be the culprit.

    When tuned for maximum economy 425s and 500s are not the best idling engines. Injection fixes this.

    The major problem with that system was Cadillac didn't include a free shop manual with every one. The average mek-a-nik at the time could have very well have been seeing this as the first injection system ever in their shop.

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