EFI system

Tiny
COWBOYSFOEVER
  • MEMBER
  • 1978 CADILLAC SEVILLE
  • V8
  • 2WD
  • AUTOMATIC
  • 77,300 MILES
Have problem w/EFI 5.7 engine. Sometimes when accelterating, engine sputters like fuel is almost shut off. It seems to start best when cold, however it will when hot, at times.I have replaced:ECM/ECU, throttle position switch, spark decoder, high idle valve, spark plugs, S.P. Wires, everything in dist, all sensors on intake, injectors, even has new rebuilt engine. When it runs right, it, s perfect. When it acts up, I think it, s starving for fuel. Also installed both new fuel pumps & blew out gas lines, new fuel filters, cleaned gas tank. Are these years known to have problems w/EFI system? Thanks in advance. Jesse
Monday, June 28th, 2010 AT 2:06 PM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,702 POSTS
Hello Jesse,

I have had that same problem with a 1979 Seville. I replaced the coolant temperature sensor and the problem went away. Please inspect/replace and get back to us. Thanks for using 2Carpros. Com
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Monday, July 12th, 2010 AT 2:04 PM
Tiny
SIERRA240
  • MEMBER
  • 2 POSTS
Hello
I have the same problem. Where can I buy such a temperature sensor? I live in Switzerland and I do not find us.
Thank you for your help
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Monday, June 13th, 2011 AT 5:24 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,702 POSTS
Any GM dealer will have it. You will need to search for a GM or Cadillac dealer on the web and have them ship it to you.
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Tuesday, June 14th, 2011 AT 4:02 PM
Tiny
SIERRA240
  • MEMBER
  • 2 POSTS
Thank you for your reply. Do you know a dealer who sends abroad?
I have already tried but without success. You know the part number for this sensor? Is this one like in the picture? Many thanks for your help.
If this does not work, I have to scrap the Seville since I no longer bring the car through inspection.
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Wednesday, June 15th, 2011 AT 4:30 AM
Tiny
KEN L
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  • 47,702 POSTS
Yep that is the sensor, I dont know any dealer here that will send abroad. Sorry
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Wednesday, June 15th, 2011 AT 6:18 AM
Tiny
HEFE HOMES
  • MEMBER
  • 1 POST
I have a 78 Seville and I’m having issues with finding an ess decoder? Can anyone Help me out please help!
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Thursday, March 1st, 2018 AT 5:42 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,702 POSTS
I'm sorry what do you mean by ess decoder?
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Saturday, March 3rd, 2018 AT 3:11 PM

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