1976 Seville Fuel Injection Problem
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 1976 Seville Fuel Injection Problem in Past Cadillac Vehicle Discussion; Hello, I own a 1976 Seville Milan Roadster and have just joined the group. I was wondering if anyone has ...
  1. #1
    djustice10 is offline Cadillac Owners Member
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    1976 Seville Fuel Injection Problem

    Hello, I own a 1976 Seville Milan Roadster and have just joined the group. I was wondering if anyone has any information on the fuel injection system used on the Olds 350 (1975 1/2 to 1979). Mine is running really rich and I can't find any decent info on the system.


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  3. #2
    VicVega is offline Cadillac Owners Member
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    Re: 1976 Seville Fuel Injection Problem

    I'd start by purchasing the Seville manuals from Helm Inc. There are three manuals ($120), one is the EFI diagnostic manuals which is about 70 pages. I have used this with good success more than once. You will also need an good volt ohm meter.

    The problem can be the choke, they get sticky, the air temp sensor or the water temp sensor. These were not well designed or well paced on the engine. When working right they do work fairly well.

    There are two other areas that you need to check out that affect fuel mixture, lean and rich. The intake manifold easily losses its gasket as does the gasket under the throttle body. The intake gaskest are still available its an Olds gasket. The throttle body gasket is no longer available you will need to cut one from gasket material, takes about an hour to do.

    This web site may be of some assistance, its new, but post and see what you get.

    http://groups.msn.com/76-77-78-79CadillacSevillesONLY/welcome.msnw


    Good luck.

    VV

  4. #3
    BeelzeBob's Avatar
    BeelzeBob is offline I'm a Cadillac Fanatic!
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    Re: 1976 Seville Fuel Injection Problem

    I would look at the coolant and manifold air temp sensor. Most common problem on that system. It has a lot of years on it so just replacing both would be considered preventive maintenance at this point. The idle air compensator is also something that doesn't age as well as the rest of the car might but that shouldn't cause any richness in the operation. I would pretty much bet on the coolant or MAT sensor.

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    djustice10 is offline Cadillac Owners Member
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    Re: 1976 Seville Fuel Injection Problem

    Thanks for the quick replies. Now I have some idea where to begin. I was almost ready to go with a carb, but hate the thoughts of modifying the engine. It ran great when I first got it. I'm appreciate the info about those manuals too. Thanks again, VicVega and bbob.

  7. #5
    VicVega is offline Cadillac Owners Member
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    Re: 1976 Seville Fuel Injection Problem

    Since parts for this EFI went obsolete in 1985 and became really hard to find within just a few years ($$$) I switched my EFI to a carb. Runs great.

    Good luck.

    VV

  8. #6
    djustice10 is offline Cadillac Owners Member
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    Re: 1976 Seville Fuel Injection Problem

    I ordered the books from Helm and got the 76 shop manual and fuel inj. diagnostics both for $40.00. What kind of carb did you go with? Can you use the FI dist. if ECM is disconnected? and what kind of fuel pump. I read where one guy removed the 2nd one on the frame and used the tank pump and a mechanical one. I was wondering about an electric one after in-tank pump that wasn't such a high volume/pressure one. I'm glad you told me about the parts situation. I really appreciate the info. I am in Michigan and only get about 5 months enjoyment out of the car, and pretty much lost last year because of the problem.

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    VicVega is offline Cadillac Owners Member
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    Re: 1976 Seville Fuel Injection Problem

    I used a Performer RPM and an Edelbrock 1406 650 cfm carb. I used an Accel HEI replacement distributor. Seems to run okay. I'll be posting a "How to" on this procedure in the near future on the SevilleOnly site I mentioned. I used just the in the tank pump, its 4-6 psi, the frame pump is 115 to 125 psi.

    VV

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    djustice10 is offline Cadillac Owners Member
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    Re: 1976 Seville Fuel Injection Problem

    Thanks alot VV, I just saw the how-to on the group website. I really appreciate all the information. Nice work on that document. That answered all my questions and then some.

  11. #9
    Kerry Lange is offline Cadillac Owners Member
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    Re: 1976 Seville Fuel Injection Problem

    VicVega, could you possibly email me your notes on the carb conversion? I've had my 77 Seville for nine years and although I've heard plenty of rumors about this conversion, nobody seems to have the details. I've given up trying to access MSN Groups for information. I was a member, but changed my email address recently and now cannot access their message board. I have emailed them several times and still cannot access the board even with the information they provided. Thanks.

    kplange@shaw.ca

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    VicVega is offline Cadillac Owners Member
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    Re: 1976 Seville Fuel Injection Problem

    Kerry,

    Watch your email, I will send this to you later tonight.

    VV

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    Kerry Lange is offline Cadillac Owners Member
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    Re: 1976 Seville Fuel Injection Problem

    Thanks, VV. That is one informative article!! Much appreciated.

    Kerry

  14. #12
    TOMMY MILAN is offline Cadillac Owners Member
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    Re: 1976 Seville Fuel Injection Problem

    Hey Vic Vega! If you are stillout there, I have a 1979 Seville that needs to be converted from EFI to carb.
    VicVega, could you possibly email me your notes on the carb conversion?
    Appreciate if anyone else who has the these or other insights to send them my way also.

    Thanx//tommy milan
    wm1776@hotmail.com

  15. #13
    Flash man's Avatar
    Flash man is offline Cadillac Owners Fanatic
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    Re: 1976 Seville Fuel Injection Problem

    Hi All,

    I know this is an old post. I have a 1978 Seville and I would like to convert the EFI to Carburetor. Not gonna screw around with this inferior fuel injection system. I want a dependable Cadillac. I have a 4v aluminum intake from a 350 Olds engine. I was going to get a 4v Quadrajet carb for the swap. My high pressure pump is shot. I just installed a new low pressure pump in the tank a few weeks ago. What would I need to do to complete the Carburetor swap. I appreciate any info on this subject. Thanks.

    Joe

  16. #14
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 1976 Seville Fuel Injection Problem

    Joe - Take a look at www.allcarbs.com - they're on Long Island and they do some incredible conversions as well as build great QJ's.

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    cadchris's Avatar
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    Re: 1976 Seville Fuel Injection Problem

    Hey Joe,

    Check out all the info I posted in this thread:

    http://www.cadillacforums.com/forums...dorado-no.html

    I'm working on some other info and will post if I get any replies.

    Regards,
    chris

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