1991cadillac Seville starts rough and dies when its warm

Asked by Apr 17, 2016 at 08:25 PM about the 1991 Cadillac DeVille Base Sedan

Question type: Maintenance & Repair

I have a 1991 Cadillac DeVille starts great when it's
cold but after I stop and try to start it again it starts
really rough and then it'll die and I have to really put
my foot into it and then the ribs go really high and
then come back down and it does it all the time I've
put in a new fuel pump new fuel filter new EGR
valve new throttle positioning sensor have all my
vacuums checked and it runs great but it doesn't
want to start when it's warm what's my problem

5 Answers

5,565

sound to me like the thermal riser and choke is stuck in the on position~ might be broken...could be jammed shut..but the thermal spring and choke right at the plenum inlet is malfunctioning....sounds like~

5,565

ok... am so old...you've got a thermal sensing goodie on the air intake ...the IAT sensor google this; 1991 Cadillac DeVille Base Sedan intake air temperature sensor --many choices..find one close for quick delivery~

Best Answer

I check my computer I'm not getting any error zero errors it's just when it gets warm it just doesn't want to start it just runs real rough and then dies and then I start it coughs and sputters dies then it starts and runs fine

5,565

well, Kathy the Computer does not know it all...the change in ambient temperature is something the ECU would NOT know...that's why it must measure how cold is it outside...when COLD will enrich the air/fuel mix....in the old days we HAD a heat riser on the exhaust manifold that would push a "butterfly" shut..them days are gone~ all we have are sensors and a computer now~

5,565

Ambient Air Temperature Sensor...have a guy change that for ye~

Your Answer

Add photo

Related Questions

  • 1991cadillac Seville starts rough and dies when its warm 5 answers

    I have a 1991 Cadillac DeVille starts great when it's cold but after I stop and try to start it again it starts really rough and then it'll die and I have to really put my foot into it and then the...

    1991 Cadillac DeVille Base Sedan

    -

    Maintenance & Repair

  • 1991cadillac deville starts to shudder when it hits 43 mph

    my 91 cad Seville shudders at exactly 43 mph. I've replaced the fuel pump and filter the egr the tps the fuel pressure reg the cat converter. .It loses power also. what is wrong with this stupid ...

    1991 Cadillac DeVille Base Sedan

    -

    Maintenance & Repair

  • Starts and dies imidietly 2 answers

    I broke my 2003 northstar cadillacs key changed the ignition cylinder and now it won't stay on for more than 3 seconds.I need my car to run what can I do?

    2003 Cadillac DeVille Base

    -

    Maintenance & Repair

  • my car starts and dies in 4to5 seconds like not getting gas 1 answer

    it will start and run for 4 to 5 seconds and die like its getting no gas ,please help only way i have to get to work

    2000 Cadillac DeVille DHS

    -

    Maintenance & Repair

  • Rough idle and loss of power 2 answers

    I own a 2003 deville, one day I started to car and it worked fine so I stopped to put some gas in it and when I started it again it had a rough idle and no power I was told to replace to oxygen Sens...

    2003 Cadillac DeVille Base

    -

    Maintenance & Repair

DeVille

Looking for a Used DeVille in your area?

CarGurus has 1,705 nationwide DeVille listings starting at $1,995.

ZIP:

Search Cadillac DeVille Questions

Cadillac DeVille Experts

#1 kikero
kikero
Reputation 2,160
#2 Js08016
Js08016
Reputation 1,880
#3 Cynthiasmith
Cynthiasmith
Reputation 1,610
View All

Related Models For Sale

Used Land Rover Defender
117 listings starting at $46,988
Used Cadillac Seville
361 listings starting at $2,500
Used Lincoln Town Car
35 Great Deals out of 1,809 listings starting at $1,495
Used Ford Mustang
692 Great Deals out of 44,321 listings starting at $1,500
Used Chevrolet Corvette
230 Great Deals out of 22,186 listings starting at $3,750

Used Cars For Sale

2005 Cadillac DeVille For Sale
241 listings starting at $1,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.