not running smoothly

Asked by Jun 19, 2017 at 08:43 PM about the Cadillac DeVille

Question type: Maintenance & Repair

have 90  coupe deville.  ran fine when stored in dec. with full tank of gas and
injector cleaner added.  came out in april keeps acting like it wants to stall out
and even does once in awhile.  mechanic's had it more than i have and still
can't find the problem.  any input would be appreciated.

2 Answers

76,455

If you can drive it long enough to use up the old gas, fill it up with Chevron gas and also add a bottle of Techron. Drive it for a while and hopefully your problems will clear up.

Best Answer Mark helpful
905

Five months of storage is not that long. A full tank of gas will not go bad that quickly. That year Caddy had the 4.5 liter V8. The idle motors on those cars were notorious for failing. Either causing extremely high idle, idle low enough to stall. or a combination of both. Those cars still had a traditional cap and rotor ignition setup. Five months of damp storage can easily corrode the contacts.If the car runs well while driving but has a rough idle when sitting still in gear. Check the ignition system. If the car seems to run fine but just dies at idle especially in gear check the idle control motor.

Your Answer

Cadillac DeVille Experts

  • #1
    kikero
    Reputation
    2,200
  • #2
    Js08016
    Reputation
    1,930
  • #3
    Cynthiasmith
    Reputation
    1,650
View All

Related Models For Sale

Used Cadillac DTS
54 Great Deals out of 1,544 listings starting at $2,975
Used Cadillac Eldorado
392 listings starting at $2,500
Used Cadillac Seville
335 listings starting at $1,795
Used Cadillac CTS
248 Great Deals out of 9,888 listings starting at $1,395
Used Chevrolet Impala
479 Great Deals out of 33,615 listings starting at $777
Used Lincoln Town Car
34 Great Deals out of 1,728 listings starting at $1,500
Used Cadillac Escalade
202 Great Deals out of 11,014 listings starting at $2,000
Used Cadillac STS
38 Great Deals out of 993 listings starting at $1,690
Used Chrysler 300
329 Great Deals out of 17,504 listings starting at $1,000
Used BMW 7 Series
146 Great Deals out of 5,852 listings starting at $2,500
Used Dodge Charger
417 Great Deals out of 27,419 listings starting at $2,495
Used Lincoln Continental
14 Great Deals out of 4,316 listings starting at $35,999
Used Mercedes-Benz S-Class
169 Great Deals out of 5,633 listings starting at $2,000

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.