help needed about a Cadillac seville 1977


Asked by gingercadillac May 03, 2015 at 02:20 PM about the 1977 Cadillac Seville

Question type: Maintenance & Repair

Hi everyone
I'm a brand new user of your forum and hope you'll be abble to help me

i own a 1977 Cadillac Seville oldsmobil engine 5.7  350 ci  first injection
While driving I've set it on cruise control then the engine stopped

I've alredy checked a few things :
the gazoline in coming to the engine
spark at the spark plug
I've changed the gazoline filter and put a new battery

I've noticed that there is no electricity at the fuel injector

It's been a while I'm mashing up my brain and fingernails !!
Any clue guys ??

8 Answers


Check for a blown injection fuse, it will be marked INJ, you could have 2. if those check good then check if you get an injector pulse signal from the ECM, if you don't then the next step is to have the system checked and these old Caddies had their own way of accessing the system. Here is a page you can look at but it usually sends you to using the old Cadillac analyzer:

3 people found this helpful.

Thanks a lot for this complete answer I'll check those Excuse the poor english from a french girl but what does ECM mean ? I'll study the very useful link you put ! Thanks again !


ECM,is the car computer.

1 people found this helpful.

thanks ! now I'll try to locate it ! aoutch !

1 people found this helpful.

Right i finally found it behind the radio and took it down now what to do with it ? How can i check if it's working or not ? Or shall I replace it anyway


Replace it they are good for 90 to 100000 miles.


Yes most likely the ECM is the issue it supplies the power to the injectors

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