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GOOD AFTERNOON MEMBERS Q. I HAVE A 1977 SEVILLE THERE ARE A FEW PARTS THAT I AM IN NEED OF, DOSE ANYONE HAVE ANY IDEA WHERE I CAN BUY THEM. BUT MOST OF ALL SOMETIMES WHEN IM DRIVING THE CAR IT STALLS THEN SHUTS OFF THEN AFTER ABOUT 15 MIN. THEN IT WILL START, THIS DOSENT HAPPEN ALL THE TIME

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  • 7 months later...

i've been very busy these past few months so now im just starting to get back. i was just driving my 77 seville the other day and it did the same thing but this time i decided to check the forum to see if i had an anwser ,wow i did thanks this weekend i will check out the map sensor in the ecu and replace the two temp sensors

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This is a digital fuel injection engine. It has a PCM and may have trouble codes. If they do exists, they will be read by counting flashes of the "Check Engine" light when you short two specific pins of the ALDL connector together. An old Chilton or Haynes that covers 1977 GM products will have the procedure.

CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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The 1977 was years before the traditional GM ALDL style connector that came along in 1981. So no flashing SES lamp by jumping pins on the ALDL.

It may....have a earlier GM style diagnostic connector...no idea how these are set up. They are mounted on the fender. See picture..

This appears to be a very helpful technical link for the '77 Seville:

http://www.cadillacseville.org/technical.html

And the vintage J-25400 Cadillac EFI tester can be seen here:

http://www.ebay.com/itm/Kent-Moore-J-25400-ELECTRONIC-FUEL-INJECTION-ANALYZER-SERVICE-KIT-CADILLAC-GM-/371072597130?hash=item5665a67c8a&item=371072597130&pt=Motors_Automotive_Tools&vxp=mtr

post-2-0-87893800-1401914286_thumb.jpg

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The 1977 was years before the traditional GM ALDL style connector that came along in 1981. So no flashing SES lamp by jumping pins on the ALDL.

It may....have a earlier GM style diagnostic connector...no idea how these are set up. They are mounted on the fender.

This appears to be a very helpful link for the '77 Seville:

http://www.cadillacseville.org/technical.html

And the vintage J-25400 tester can be seen here:

http://www.ebay.com/itm/Kent-Moore-J-25400-ELECTRONIC-FUEL-INJECTION-ANALYZER-SERVICE-KIT-CADILLAC-GM-/371072597130?hash=item5665a67c8a&item=371072597130&pt=Motors_Automotive_Tools&vxp=mtr

When I saw your picture of the orange connector on the inner fender, I remembered my '78 Caprice Classic had one just like that.

Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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The 1977 was years before the traditional GM ALDL style connector that came along in 1981. So no flashing SES lamp by jumping pins on the ALDL.

It may....have a earlier GM style diagnostic connector...no idea how these are set up. They are mounted on the fender. See picture..

This appears to be a very helpful technical link for the '77 Seville:

http://www.cadillacseville.org/technical.html

And the vintage J-25400 Cadillac EFI tester can be seen here:

http://www.ebay.com/itm/Kent-Moore-J-25400-ELECTRONIC-FUEL-INJECTION-ANALYZER-SERVICE-KIT-CADILLAC-GM-/371072597130?hash=item5665a67c8a&item=371072597130&pt=Motors_Automotive_Tools&vxp=mtr

I thought that I remembered my 1977 Chevrolet Malibu having the feature that would flash codes through the check engine light. I suppose not.

I browsed your links. Between the troubleshooting charts and the analyzer, the two of them approaches having an FSM and a Tech II for DIY work. The troubleshooting chart seems to say that the probably cause of stalling while running and not restarting immediately is a crank or cam sensor, or electrical connections, particularly to the fuel pump.

CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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